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In Reply to: RE: Pondering DHTs for headphone use posted by KG4NEL on January 05, 2016 at 06:06:24
Jim,
I mostly listen to DHTs and headphones (Beyer 600ohms) and Magnequest TL-404, a 2W rated autoformer, so you have to run a DC blocking cap. The TL-404 has taps at both speaker level (4,8,16,32) and also at line level (125,250,500) and presents a 5,000 ohm load end to end, so it's ideal for a 45. I use various plate chokes, usually a Magnequest EXO-010.
I'm a pathological tube roller so I rotate through 4P1L, 1LE3, 1N3S, 1J6G, 6P21S, 01A, 12A, 26, 30, 31 and subminis like 5676, 1P24B, etc. I use batteries and DC wall warts for filament duties.
Sowther has variety of multi-tap series and parallel feed transformers. On the cheaper end of the spectrum I've had good luck with Edcor GXSE5-600-15K, GXSE5-600-5K and Carnhill VTB2291.
Matt
Follow Ups:
"On the cheaper end of the spectrum I've had good luck with Edcor GXSE5-600-15K..."
I had a short discussion with someone here at one time regarding this transformer. Was that you? I have it in mind to use these to transform 5K to 200, rather 15K to 600. Using them at a lower operating Z should extend their response at both ends of the spectrum. The only caveat I can see is the need to reduce their in-circuit power in order to avoid early saturation at bass frequencies. Given the miniscule power requirements of phones, I don't think that's a problem. Does any of this ring a bell?
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Buy Chinese. Bury freedom.
I don't know if that was me or not. I've used both these transformers since Edcor released them. The GXSE5-600-5K has been in daily use for more than five years. They are still so cheap its easier to plumb them into a circuit and then have a go at making it better.
I've never felt they were weak at either frequency extreme. I use them for preamp duties not headphones, the GXSE5-600-15K I've used with many different phones. Neither are in the same league as TL-404s, but that is not expected.
Matt
OK, thanks for your comments on this. If I test the 600/15K for the application I have in mind, I'll post results.
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Buy Chinese. Bury freedom.
Another nice directly heated tube that can be run entirely off of batteries is the 6418. It is a pentode, but looks pretty nice when triode strapped.
Thank you for the suggestion. I know they are popular sub-minis but they don't sound as good in the applications I use as do 6088s or the Russians like 1P24B.
Matt
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