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In Reply to: RE: Input tube suggestions? posted by Genp on July 11, 2016 at 13:28:37
I would say, having built or heard many DHT implementations, that the best first stage I know is Ale Moglia's 01A preamp stage. It's truly magical.
http://www.bartola.co.uk/valves/dht-pre-amplifier/01a-preamp-gen2/
I would equally say that the best driver stage I know is a 4P1L in filament bias with Rod Coleman's regs, and ideally a choke input filament supply.
http://www.bartola.co.uk/valves/2016/05/08/4p1l-preamp/
http://www.bartola.co.uk/valves/for-sale/gyrator-pcb/
Ale Moglia is a friend, and I've tried out his ingenious designs over the years as they got more and more sophisticated. We started off with 26 preamps over 5 years ago, then went on to 4P1Ls, and simultaneously with Ale's gyrator designs, Rod Coleman was developing his filament regs and Thomas Mayer was showing how filament bias could eliminate cathode bypass caps. Three very clever people who have between them moved the state of the art forward way beyond the simpler solutions like 6SN7s.
It's not a simple build, but it's a whole level up in sound quality if you make the decision to go for it. There's plenty of support on DIY Audio for all these new designs - long threads on 26, 4P1L with build instructions, schematics, tweaks and so on.
Follow Ups:
I know these guys and have a 01A line stage. Not Ale M. version but use Rod C. regulators (filament bias) and It sounds great.
If you know Ale, Rod and Thomas then you're in the right company!
I've built several 26 preamps and 4P1L amps, but the Gen 2 01A blew me away when Ale brought it over and we A-B'd it with 4P1L and 26 preamps and some other stuff. The Gen 2 into 4P1L driver into 4P1L SE was a pretty perfect combination.
This thread reminded me I need to build his Gen 2 preamp, and I just got all the parts in. He has some new gyrator PCBs on his site. It's all getting very sophisticated, with Rod's regs several revisions down the line from the original. Some very clever stuff going on.
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