Lundahl chokes The company employs about 25 people and is located in the small town Norrtälje, just outside Stockholm, Sweden. Chokes Interstages & Hello, I wanna make a so called DRD amplifier with a vt25 tube. Tube output Moving coil input Input and DC-free line output application Interstage, headphone and line output transformers Mains transformers Chokes Metal Housings Choke LL1638 The LL1638 is a 2 coils choke for tube amplifier anode supply. 35 mm), and grain-oriented steel, which has lower hysteresis than regular silicon steel. LL1673 Lundahl Anode Choke. As long as max voltage rating is not exceeded, all our power supply chokes can be used in choke input configurations. So we have to go back to the roots, and use high quality, large value chokes, like in the old days of radio It was planned to experiment with choke loaded drivers and selected for the Lundahl LL1668 25mA 100H anode choke. The choke is available with Lundahl transformers was founded in 1959 by Lars and Gunnel Lundahl, and is located in the big town of Norrtalje, in the Stockholm region. Resistor . Anode chokes, interstage, headphone & line output transformers; Input & DC-free line output application; Mains transformers; Moving coil input; Tube output; Sowter. > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Interstage transformer, LL1635-PP. 0A. 100mA. LUNDAHL. £81 £97. 2X Lundahl LL 2733 700mH / 1A 2X Lundahl LL 1638 4Hy / 400mA each Choke 55€ pse ask for shipping costs ( DHL with tracking) Have FUN! LL2733: Lundahl Choke. Model LL1673-20H. The choke is built with two coils and using Lundahls special audio C-core. LL1638 Lundahl Power Supply Choke. Another brand anode choke or interstage laying around? Let me know. 160mA. LL1638_HOUSING . After running the operations in the basement of their house in Stockholm for a few years, they moved to Norrtälje and opened the factory there. Lundahl LL1694 Lundahl Filament Choke. · Optional Upgrade: Lundahl nano crystal core analog PSU chokes. Lundahl Anode choke, LL1668. Model LL1660-PP. The LL2773 is a 2 coil choke for tube/valve filament current filtering or other high current low voltage applications. The kit adds two other functions that are useful. LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 V + 1 2 3 LL1668 4 The choke is available with different core air-gap, which results in different inductance and DC current capability. You are correct that adding a much larger second cap only improves the resutls across the CC source on theouput. The choke is built with two coils and are using our own special audio C-core. Model LL1668. Is the LL1670 meant to be used this As per title I'm looking to buy LL1667 anode chokes for a project. The LL2771 is a big dual-coil choke for high current tube amplifier anode supplies. SWEDEN . Lundahl Anode chokes, interstage and line output. . LL1673 The LL1673 is the industry standard HT choke for valve amplifiers, available in 10H, 15H and 20H. £63 £75. 1,35 kg; Description. Lundahl LL2733 Lundahl Filament Choke. 0176-13930 . The inductance and current values given below are for the series connection. 4uF . Technology: Lundahl plate chokes have a windings technology with maximum sectioning. Choke LL2742-100mA. LL1685: Lundahl Choke. OPT's and the like are ALL made to order due to the many different sub types, ie mA/H ratings that LL1670 Lundahl Grid Choke 0. Amorphous Core Choke LL1673AM-20H. Inductance: 8H. This item is a The LL2772 is a 2 coil choke for tube/valve filament current filtering or other high current low voltage LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic SE-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 Note! The LL2772 can also be used in choke input power supplies Chokes: Plate Choke. Would have been great for Line Output Transformer for Tube Amplifiers LL1630-PP. I'm hoping I can get up to 200H per winding based on my DC current requirements. From Lundahl, high value chokes are achievable at the same price as HiFi capacitors, like from a Mundorf or Black gate. Chokes, interstage and output transformers are wound on the well known C cores. The coils are wound using a low-capacitance coil winding technique. Because i wanna use a choke input with an LL2743 anode choke wired as a common mode one using probably something like 880-0-880 ac input at the recifier i did ask Lundahl if LL1667: Lundahl Anode Choke The LL1670 is a small, high-inductance grid choke for tube amplifiers. LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic SE-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 Note! The LL2733 can also be used in choke input power supplies Power Supply Chokes: Type: Inductance: Usage/Comment: LL1638: 1 – 8 H: Mains choke: LL1673: 2. 4H: Filament choke designed for DC supply directly heated tube filament Hello, I have been using Hammond and Lundahl chokes in both high and low current circuits. The inductance and current values are given for the series connection. C1 . The coils is wound using a low The LL1673 is a 2 coils choke for tube amplifier anode supply. Lundahl Anode choke, LL2743-70mA. > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Amorphous core Anode choke, LL1668AM. Last Update: This will work best when the two chokes are wound on one core. So we have to go back to the roots, and use high quality, large value chokes, like in the old days of radio design. 10H. Filament Current Choke LL2733 The LL2733 is a 2 coil choke for tube/valve filament current filtering. More details . For free. 2 mm vs. This is considered as a choke with “dual secondary”. . LL2733/1. Model LL1668AM. By Jac van de Walle. Does that mean only one is needed for a push-pull pair of tubes? If so, then each end of the choke would go to a grid, while the center tap would go to ground. Optional Upgrade: Lundahl nano crystal core analog PSU chokes. 5A/3A. This technology was adopted from the input signal transformers, and it works for a plate choke as well. 0176-13935 . The coil is wound using our standard high internal isolation technique with > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Interstage transformer, LL2746. Selling 4x Lundahl LL1638 chokes 4H 400ma, like new 65€/piece, will ship worldwide Lundahl Anode chokes, interstage and line output; Lundahl Interstage transformer, LL1671-30mA; search Lundahl only has a couple anode chokes, but they can be configured differently to meet different specifications. Power Supply Chokes 2x 3H/500mA - 120 (pair) 2x 6H/250mA - 120 (pair) Line Level Transformer (Sold) 2x LL7903 - $200 (pair) Output Transformer - (Sold) 2x LL2745/8mA - $150 (pair) The LL2745 is a specially designed line output transformer for O1a and The LL1694 is a 2 coil choke for valve filament current filtering up to 1. What does that mean? Lundahl transformers. Variant. The LL1668 is an anode choke for tube amplifiers. The LL1685 is a two-coil choke for tube amplifier anode supply. The coils is made using a low capacitance coil The LL1685 is a two-coil choke for tube amplifier anode supply. Many people here simply can not see any benefit. The coil is wound using our standard high internal isolation technique with isolation foil between each copper LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic SE-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176 > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Anode choke, LL2743-70mA. Anode chokes, interstage and direct couple line output transformers. 40 Inc. You can connect them in parallel or series to get either double inductance or double current rating. In a perfectly balanced symmetric supply (i. The coil is wound using our standard high internal isolation technique with isolation foil > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Interstage transformer, LL1660-PP. The high voltage is delayed for 30 seconds I already have the Lundahl chokes, so I would like to use them. LL1673: Lundahl Choke. For instance, I use NP Acoustics amorphous chokes from Vietnam which I like a lot. I used a standard 100Hz frequency and on lundahl LL1638 20H/75mA choke I measured about 11H, Lundahl 10H/150mA choke - about 6H and other 20H/80mA choke has 14H. Lundahl Transformers is a world leading manufacturer of high performance transformers for audio applications. The LL1685 is a 2 coils choke for tube amplifier anode supply. Lundahl amorphous core input transformers on S/PDIF and AES Inputs; LC choke input analog power supplies with custom Lundahl chokes. My buddy Thomas Mayer (Vinylsavor) uses them and is very happy and i decided to use 4 of them in my fully differential preamp. £84 £100. The two-coil structure dramatically reduces the risk of picking up hum caused by external The Lundahl data sheets give many examples of configuration, we found a few more, mostly advised by our customers. com Signal choke LL1964 The LL1964 is a compact choke for audio applications. Lundahl; Item no. The LL1667 and LL1668 are anode chokes for tube amplifiers. · Ultra-fast ultralow-noise zero recovery SiC Schottky rectification diodes. The transformer is available with different core air gap for PP or SE drives. 5: 40 – 160mH: Filament choke designed for DC supply directly heated tube filament. How we store our products. LL1630 is a line output transformer for tube amplifiers. LL2742 can be used in choke input and cap input applications. Zur Navigation springen. Our chokes are built to order in our dual coil single C-core style. Lundahl Chokes Thread starter ligascon; Start date 2024-09-13 1:31 pm; Jump to Latest L. C1 is still ringing like a bell. Phono. Lundahl Power supply choke, LL1673-20H. 4 A. Filament Current Choke LL2772 The LL2772is a 2 coil choke for tube/valve filament current filtering or other high current low voltage applications. Good_Storage. Model LL1930. What are your experiences of plate chokes and hot tips for good ones? Chokes: Plate Choke. 76” x 3. The LL1638 is the industry standard HT choke for valve amplifiers, available in 8H and 10H. But I consider the 5 Henry 200mA choke to be better than the 20 Henry 100mA choke . About grounding and shielding. I think any of the three listed Lundahl chokes is going to provide reasonable performance in your application as long as you keep the choke clear of external magnetic fields, and the input impedance of the power amplifier is sufficiently high as not to constitute a significant load on the 26. Model LL2746. The two coil structure greatly reduces the risk of picking up hum caused by external magnetic fields from e. > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Interstage transformer, LL2753. Inductance: 100mA. 15”) footprint : Material ; 2 mm construction steel ; Finish . Fax +46 - 176 13935 . Phone +46 - 176 13930 . · LC choke input analog power supplies with custom Lundahl chokes. Lundahl Amorphous core Anode choke, LL1668AM. Lundahl Interstage transformer, LL2753. 42% of original RMS voltage. 110 mm (4. To get closer to 60mA without further decreasing the bias, I may swap in 1. Price: £84 Lundahl LL1667 - 15mA - 270H - 2. The choke is available with different core air-gap, which results in different inductance and DC current capability. , mains This all changed as soon as i tried Lundahl chokes. Some examples of DC Output voltages: Windings : 60mA: 100mA: 140mA: 250 - 0 - 250 271V LL2773: Lundahl Choke; LL2773: Lundahl Choke. com, www. At low frequencies (100-120 Hz) the coils are fairly well coupled and thus act Silver wire Tube Amplifier Interstage Transformer / Line Output Transformer LL1660Ag-PP . · 3 independent power supplies with 15,000uf Mundorf 4-pole capacitors. 15H. Price: £49 £58. Lundahl Interstage Per wound a standard dual coil Lundahl choke (same size as the LL1685 B+ chokes) that will do 1. LL2771 – a big (1A, 3H) power supply choke. New Lundahl MC Step-Up Transformer; Price Increases on “Other Kits” New Lundahl Audiophile Transformer and PS Chokes; Gerus Audio is using Lundahl Transformers in their Amplifiers; Archives. Model LL2753. Article - Text only . Take a look at the following link. , and 3A with coils in parallel for 2A3/GM-70, etc. Read_More About Amorphous Cores. Mine is potted, the other one is used as-is. Page 1 of 4; 373 Items Found, Show items 1 - 100; Improve your search. Next product Lundahl LL2743 Tube anode choke. This prevents the Lundahl plate pick up any hum signal, even though such a magnetic (hum) field is always present at a certain level. Model LL1660-10mA. The choke is a single C-core, dual coil structure using our own special audio C-cores. mains transformers. A choke input circuit applies a much higher AC voltage (hundreds of volts) across the choke than when used in a CLC circuit (likely below These are all unused and never mounted. LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 . Like all Lundahl chokes they are wound with two separate coils which can be connected in series or in parallel. Dimensions . They offer EVERY Audio transformer you can think of: From Lundahl, high value chokes are achievable at the same price as HiFi capacitors, like from a Mundorf or Black gate. Lundahl Power supply dual-coil choke, LL2771-1. LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 NOTE: Transformers such as chokes, interstage, OPT's and the like are ALL made to order due to the many different sub types, ie mA/H ratings that Lundahl offers. Eventually progressed beyond Lundahl to amorhous and today would not consider a PS without chokes. Thats why they have abrupt jumps. Other chokes can be used by adding a jumper to the PC board. 50uF . LL2751: Lundahl Choke. 7A: 0. I have a separate SS line stage for my LC choke input analog power supplies with custom Lundahl chokes. The system used is MP50Di power amplifier (a MOSFET amplifier). No more difficulties or problems, clean wiring, and all options. Tweet Jaga Google+ Pinterest . LL2745 is a line output transformer for tube amplifiers. Lundahl Chokes for tube amp power supply or filament current supply Chokes for tube amp power supply or filament current supply. The data sheets are linked below: LL2766 – a compact (LL1660 size) low power output transformer for tube amplifiers, SE or PP. Ultra-fast ultralow-noise zero Lundahl LL1673 Lundahl Anode Choke. The LL1673 is a 2 coils choke for tube amplifier anode supply. So unlike a regular chokes, the Lundahl chokes work up to 20kHz or more. Click to Zoom. The coils are made using a low-capacitance coil winding technique. A lot of Lundahl's transformers are available with Amorphous cores, nanocrystalline cores and silver wire. The coils is wound using a low capacitance coil winding technique. Price: £77 £92. Very low DCR around 60 Ohm only. 33”) tall, 95 x 80 mm (3. More details Tweet Share LL2742: Lundahl Choke. 0. As the parallel capacitance of the choke is missing in the Lundahl Transformers AB, Norrtälje, Sweden, Phone +46 (0) 176-139 30, office@lundahltransformers. Think SE 45/46/47 or PP 6V6GT and many more low power possibilities. Condition New . The LL1673 is a two-coil choke for tube amplifier anode supply. Can be used for example for Lundahl LL1667 and LL1668 plate chokes or LL1660 interstage transformers. Lundahl Interstage transformer, LL1660-10mA. It is built with two coils and uses our own special audio C-core. and DIY builders around the world. Use Hifi Shark to monitor pricing and global availability LUNDAHL FILAMENT CHOKE Audio Kontakt €70 Dec 11, 2022 Kleinanzeigen Lundahl Drossel LL1673 Kleinanzeigen €75 Jan 17, 2025 Kleinanzeigen Lundahl LL1685 I followed this article from EmissionLabs and tried using recommended option 5 (scroll to the very bottom of the page) in a PP amp with Lundahl LL1673. Breadcrumb: Lundahl LL1667AM amorphous core The LL2772 is a 2 coil choke for tube/valve filament current filtering or other high current low voltage LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic SE-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 Note! The LL2772 can also be used in choke input power supplies Design Considerations for a 5U4G or 274B Tube Power Supply, using a Choke. The LL1667 is an anode choke for tube amplifiers. Available to buy online at Orso Audio. 80 Inc. LL1685 can be used All Lundahl chokes are wound with two separate coils which can be connected in series or in parallel. 5 – 20 H: Mains choke: LL1685: 2. The chokes are built with two coils and are using our own special audio C-core. I have a general question about the Lundahl LL1670 grid choke. VAT / Quantity: Add to cart . Silver wound version (pure silver content). 8H. The one is, the user does not know the AC voltage across the choke. Lundahl Transformers AB was founded 1958 by Per Lundahl's parents Gunnel and Lars. Our This year we have extended our range of chokes and inductors, and therefore restructured our web page where the chokes are presented. Previous product. The choke can be ordered with different air gaps for various DC currents. Price: £81 £97. Please allow 4-6 weeks shipping! NOTE: Lundahl will be closed for the festive season from 12/21 until 01/06/25. Choke . The 1667 has one set of parameters, then you jump to the 1668 which has another set, and then 2763 has yet another set. 1,35 kg; Shipping weight. The solder connections for these Hello, The LL2733 and its bigger brother the LL2771 are well known to just a few people. using LL1623/PP, LL1660/10mA and Lundahl mains and chokes; 2A3 PSE – Parallel Single Ended ”The New Reference Amplifier”, using the LL1627/120mA, LL1660/10mA and Lundahl mains and chokes; KT88 push-pull amplifier using This means all power supply chokes are also possible to use as tube anode chokes. 470k 5Watt . Power Choke. Choose options Quick view. Line Output Transformer LL2745-PP . So the tube runs at gain=µ. Lundahl receives the high flux Premium audio transformers Pro Audio Transformers used between the artist and the record medium. Optional Upgrade: Lundahl amorphous core analog PSU chokes. Print ; The 80mm covers can be used for small chokes or transformers. Lundahl Mains Transformers. The use of C-cores with well-defined air-gap results in an almost constant inductance throughout You should ask Lundahl for the test AC voltage and DC current used to measure the inductance. Add to cart Quick view. LL1673 can be used in choke input and cap input applications. The maximum AC voltage for Lundahl chokes is extremely high. We have a wide range of chokes and inductors for tube amplifiers, ranging from anode choke LL1667 (operating current from 5 mA) to filament current choke LL7233 operating at 3. The buzz disappeared completely after I connected both coils in a serial connection Lundahl Anode chokes, interstage and line output; Lundahl Interstage transformer, LL1671-PP; search Per Lundahl, the winder of these chokes (and the other transformers in the KISS amps), told Jute on Amps: "The LL1638 consists of two coils and a common core. The LL2773 is a 2 coil choke for tube/valve filament current filtering or other high current low voltage LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic SE-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 Note! The LL2773 can also be used in choke input power supplies Choke LL1638 The LL1638 is a 2 coils choke for tube amplifier anode supply. Prefer in Europe. The LL2733 is a 2-coil choke for tube/valve filament current filtering. Well, Lundahl from Sweden is well known for it’s C-Core based. the real world) you need to stop both common-mode and differential-mode ripple so you need two separate chokes. The photo above shows three versions: 50Hy/90mA, 65Hy/70mA and 90Hy/50mA. The substitution of these for the Hammonds lowered the noise floor dramatically and, interestingly enough, increased the music dynamics considerably Starting to build a power supply for first attempt at Rod's shunt cascode RIAA circuit and the two filter chokes I have on hand for an LCLC filter are both dual coil (Lundahl). Die 80mm Haube ist geeignet für kleine Drosseln oder Trafos, Innenmass 70*70mm. Lundahl indicates that this choke is available with different air gaps to increase inductance for lower DC current. The data sheet s suggests using one coil in B+ Jac informs me that the Lundahl chokes have about 15% additional headroom, so I'll leave it as is for now. D. ligascon. Housing for LL1638 and LL1660 size chokes and transformers. The LL1673 is a 2 coils choke for tube amplifier anode supply The choke is available with different core air-gap, which results in different inductance and. Inside dimensions: 70*70mm. What does that mean? Choke LL1638-4H The LL1638 is a 2 coils choke for tube amplifier anode supply. Lundahl has a magnificent series of universal, signal transformers. Lundahl Interstage, Headphone and Line Output Transformers. Note that source impedance in this configuration is > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Line output transformer, LL1930. How to bias plate chokes. The coil is wound using our standard high internal isolation technique LL1673 can be used in choke input and cap input applications. Don't damage your transformers! Why choose Lundahl CHOKES. Lundahl audio transformers for audio gear. The value you have chosen should do fine. They were designed to work as filter chokes in 50Hz or 60Hz full wave rectified B+ filters (100Hz and 120Hz respectively). Grid Choke. The ripple voltage from a rectified sinus signal, is approx. TRANSFORMERS. Lundahl Mains Isolation Transformers. This item is a recurring or deferred purchase. Am happy with both the (7) 10-15mA version; will choose driver accordingly. This is so with all Lundahl chokes. It is available with different core air gaps, which results in different inductance and DC current capability. g. The call is yours. LL1673AM; Product weight. A low cost choke is a terrible source of magnetic and electric field Many famous brands use Tango, Tamura, Hashimoto or Lundahl transformers on their amplifiers and not without good reason. l must admit i RE: single Lundahl LL1670 grid choke for Push-Pull? Posted by rongon (A) on November 30, 2015 at 09:16:10 . The chokes are separated into four different categories based on operating current. Is good storage important for you? By Jac van de Walle. Joined 2004. Inductance: 10H. 8mA. The LL2742 is a 2 coils choke for tube amplifier anode supply. Breadcrumb: Start > Audio transformers > Lundahl > Anode chokes, > Lundahl LL2743 Tube anode choke. By The chokes are built with two coils and are using our own special audio C-core. This is a useful feature for so called choke input rectifier circuits, but it is not needed in many other cases. Model LL1635-PP. Where quality and transformers meet. LL1667 Tube anode chokes. Amorphous Core Choke LL1685AM-100mA The LL1685 is a 2 coils choke for tube amplifier anode supply. 20 Inc. The choke is built with two coils and is using one of our own special audio C-cores. The core is assembled with a small air-gap to compensate for any mains DC- unbalance. More details Tweet Share The LL1670 is a small size, high inductance grid choke for tube amplifiers Zur Navigation springen Breadcrumb: Start > Audio transformers > Lundahl > Lundahl LL1670 Grid choke LL1668: Lundahl Anode Choke. The LL1670 is a small size, high inductance grid choke for tube amplifiers. Show original picture. So we have two ways to select a choke from the Lundahl palette. Our power supply chokes are designed to work at 100/120Hz and with voltages around 100V. View larger. These transformers The comparison has been done with original Lundahl LL1673 (same Choke). The LL1667 and LL1668 are anode chokes for tube amplifiers The chokes are built with two coils and are using our own special audio C-core The coils is mad. Lead time Most transformers are made to order and incur a 4-8 week winding time, we do stock some popular models in which case your order will be shipped immediately. 10 Henry . Lundahl Interstage transformer, LL1635-PP. 4K - (other models available) Lundahl LL1668 - 25mA - 100H - 680R - (other models available) Plus many others from smaller transformer winders. There Choke LL1673-10H. Medium charcoal The choke is built with two coils and are using our own grain-oriented silicon-iron audio C-core. Lundahl High Current Choke, LL2773-5. Thinking that something was wrong with a meter I tried another meter MOTECH 4080 with regulated measuring voltage. > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Anode choke, LL1668. · Optional Upgrade: Lundahl amorphous core analog PSU chokes. Breadcrumb: Lundahl LL1668 tube anode choke. LUNDAHL TRANSFORMERS Tibeliusgatan 7 International Domestic S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 V + 1 2 LL2743 3 4 SE V Used Lundahl for sale on 400+ second hand hifi sites & shops. H u mm mmmm. Joined 2002. Our tube amplifier transformers are built in our dual coil single C-core style and can be ordered with a choice of core air-gap for Push-Pull or Single-Ended applications. We have a wide range of chokes and inductors for tube amplifiers, ranging from anode choke LL1667 (operating current from 5 mA) to filament current Lundahl Mains Transformers Lundahl manufactures a limited range of C-core mains transformers, primarily for tube amplifiers. For Lundahl chokes the superior “common mode” connection is accommodated. Bias_Plate_Chokes. Dennis Hui. By_Per A common-mode choke is not the same as a pair of smoothing chokes. 2024-09-13 1:31 pm #1 2024-09-13 1:31 pm #1 Selling: One pair of Lundahl LL1673/10H: 140 Euros + Shipping One pair of Lundahl LL1638/20H: 140 Euros + Shipping Anode chokes, interstage, headphone & line output transformers, Input & DC-free line output application, Mains transformers, Moving coil input, Tube output Zur Navigation springen Breadcrumb: Start > Audio transformers > Lundahl The LL2751 is a small size two-coil choke for tube/valve filament current filtering. As Per Lundahl always said, new configurations can be, and will be found. Member. Model LL2743-70mA. Lundahl Interstage transformer, LL1660-PP. 20H. August 2018; June 2018; February 2018; December 2017; September 2017; July 2017; February 2016; October 2015; September 2015; August 2015; July 2015 Tube anode chokes LL1667 . In Reply to: RE: single Lundahl LL1670 grid choke for Push-Pull? posted by rongon on November 30, 2015 at 08:43:15: Lundahl plate chokes are better in several ways: they have low winding capacitance, thinner laminations (0. The coils are made using a low capacitance coil winding technique. balanced load, as well as balanced PSU) you might be able to use a differential-mode choke, but in an unbalanced supply (e. The best are their chokes with amorphous core - very low hysteresis and very thin laminations. It is built with two coils and uses one of our special audio C-cores. From 1955 but still modern today. I noticed that it's center tapped. I fired it up and can detect no vibration from the chokes, so they seem reasonably happy. Both are serious chokes and because Doede just told us that the current being drawn is just 400 mA with the equivalent of a 4 board Tent shunt DDDAC we can ask Lundahl to adjust the airgap to get the current rating of the choke closer to the actual current resulting in much more Choke LL1685-130mA. The LL2773 is a 2-coil choke for tube/valve filament current filtering or other high current low voltage applications. 9 Belleson SPX ultralow-noise regulators isolate IC chips, modules, and clocks. 5 – 17H: Mains choke: LL1694/1. For selection purposes, I ran simulations with the above mentioned tubes and a corresponding anode inductance in LTspice. LL2733 Lundahl Filament Choke. S-761 50 NORRTÄLJE . pdf Version . The coil is wound using our standard high internal isolation Line Output Transformer LL1689-18mA LL1689 is a line output transformer for tube amplifiers. These must be mounted sideways as shown on the photo. LL1660 is an interstage / line output transformer for tube amplifiers. The coils is made using a low capacitance coil winding technique. The other side of the LL1673. The core is an audio C-core of our own production. > Lundahl transformers > Lundahl Anode chokes, interstage and line output > Lundahl Interstage transformer, LL1660-10mA. The choke is available with different core air-gap, which results in different inductance and DC current capability. If you want to make the best amplifier possible, these are the transformers to use. I ended up with a significant buzz that showed up only when I connected inputs of both channels directly or through a preamp. Most induction meters work at We have a wide range of chokes and inductors for tube amplifiers, ranging from anode choke LL1667 (operating current from 5 mA) to filament current choke LL7233 operating at 3. Chokes and nothing but. This is rather called amorphous material, because it is not metal, but an alloy of metal and glass, replacing actually some properties of metal, by those of glass! Amorphous . Based on simulations, this will start to roll off below about 200 Hz, but it's only down a small amount. Choke input for me is unavoidable due to the mercury rectifiers, but this preference is not universal - some people seem to prefer the sound of cap input supplies. 130mA. 2K cathode resistors in place of the stock 1K. They do one thing: they present a very high, almost infinite load to the anode. lundahltransformers. If you have any questions about this product or need some help with your design please contact us. Tonu, the Lundahl anode chokes are 1st choice. As an option, you can connect termination resistors directly on the board, for applications where the data sheet advises so. Winding schematics, physical dimensions, pin and mounting hole layout (all dimensions in mm) All Lundahl chokes are wound with two separate coils which can be connected in series or in parallel. This is why we recommend using largest chokes, and actually today these are not overly expensive. Audiophile Transformers, the unsung heroes that bridge the gap between your audio source and speakers. Lundahl Transformers will shortly announce the availability and pricing for three new parts. The coils is wound using a low capacitance coil Lundahl Anode chokes, interstage and line output; Lundahl Interstage transformer, LL1660-18mA; search The Lundahl chokes have much more resistance compared to recommended value and will cause severe penalty on tansient reproduction due to the higher resistance. The coil is wound using our standard high internal isolation technique with isolation foil between each copper layer. Lundahl Interstage transformer, LL2746. The transformer is highly sectioned, and wound with a special low capacitance winding technique. The two-coil structure greatly reduces the risk of picking up hum caused by external magnetic fields from, e. More details Tweet Jaga This is the Lundahl Factory . C2 . Lundahl Tube output; Lundahl Moving coil input; Lundahl Input and DC-free line output application; Lundahl Anode chokes, interstage and line output; Lundahl Mains transformers; Lundahl Chokes for tube amp power supply or filament current supply; Lundahl General purpose; Lundahl Microphone transformers; Lundahl Line input › Lundahl Transformers › OEM › Custom Made › DIY Modules + › Dexa Technologies NewClassD › DIY HI-Fi Supply › Tentlabs Lundahl Chokes. Lundahl Anode chokes, interstage and line output; Lundahl Interstage transformer, LL1660-10mA; search The LL2733 is a 2 coil choke for tube/valve filament current filtering. 5A with coils in series for 45/6A3/6B4G/300B, etc. Lundahl. Lundahl Line output transformer, LL1930. VAT. The coil is made using a low capacitance coil winding technique. Lundahl Transformers - Tube amplifier transformers Greetings, Edward P. Lundahl Chokes. e. The LL1670 is a small, high-inductance grid choke for tube amplifiers. Price: £84 £100. LL1685 can be used in choke input and cap input applications. The coil is wound using our standard high internal isolation technique Lundahl tube amplifier transformers are built in a house-made dual coil single C-core style and can be ordered with a choice of core air-gap for Push-Pull o Zur Navigation springen Breadcrumb: Start > Audio transformers > Lundahl > Anode chokes, interstage, Grid choke LL1670 . The LL2743 is an anode choke for tube amplifiers. These vital components have played a pivotal role in capturing the artistry of musicians and preserving their performances with unparalleled fidelity. This may be used with D3a, 6e5p, ECC99 and alike. LL1670: Lundahl Grid Choke. Both the Hammond 20 Henry 100mA choke and 5 Henry 200mA chokes could be used as a constant current sink, or constant current source. The LL2751 is a small size two-coil choke for tube/valve filament current filtering. Home / Product / LUNDAHL / Chokes. 60 Inc. > Lundahl transformers > Lundahl Chokes for tube amp power supply or filament current supply > Lundahl Power supply choke, LL1673-20H. 1 – 0. Parallel connection will result in one quarter (1/4) of the LL1685 Lundahl Anode Choke; LL1685 Lundahl Anode Choke. s on his website there is also some info about higher admissable current to the lundahl filament chokes when the voltage is lower> Because Pass The beauty of C-Core Choke. In stock! Shipping time: 1 - 2 workdays LL1650 is a C-core mains transformers. Originally, the preamp is Aikido based with 6AS7 and 6SN7 (correct me on this), but during this test, the tubes are changed with something new (compatible) which I sale for a friend 4 chokes in very good condition, located in Germany. Changing form 250mV to 1V I got only minor inductance change. Heater Choke: PCBs for Phono. One of the best books about transformers. ugzsph upoj jawcm onqqht ncmap whvds mwjspu ufu vxzw phemsmm