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This amplifier prototype play two 4P1L in parallel single ended.
The sound is very detailed. Output transformer is a DIY 2K5 ohms.
Plate voltage is 200V and 25mA per 4P1L. Coupling capacitor is a Russian K40Y-9.
The sound is very detailed, see the video
https://www.youtube.com/watch?v=sDnyjd7B50U&feature=youtu.be
Aldovan
Follow Ups:
Parallel is probably the way to go . I find a single does not cut it unless really sensitive speakers are used but then you open up potential microphony problems . I am currently working on my third 4P1L/mosfet hybrid and it's a really nice valve to use as a driver in this application . Try backing off the filament voltage if microphony is an issue for you . Using 3.7-3.8V usually helps .
Al
Congratulations! It's a good sound, isn't it!
Would you like to post your schematic?
Andy
Did you go to that you youtube video and hear it? I was absolutely shocked at the clarity.
Honest amplification is better than excessive 2nd order distortion anytime.
LOL That is the dumbest remark I have read on here for a while . How on earth can you tell what an amp sounds like on Youtube ?
Al
you would be surprised with a good dgital p c set up you can sure get an idea of different sounds of he speakers. Some guys use hi end mics
Double LOL !!! Sorry but I fail to see the point , decent microphone or not . Auditioning amps on Youtube . Come on !!!!
Al
The 4P1L is pretty much like what you are hearing - dynamic, very clear, very detailed.
Aldovan has a different kind of circuit from me - more classic with cap coupling and cathode bypass caps. I like filament bias with the 4P1L and I couple with an interstage. I wanted to remove as many caps as possible since to my ears they blur the sound slightly. Whatever circuit you use, it's worth hearing this tube.
This is the schematic.
Is very simple.
Aldovan
Aldovan, very nice! I'm going to try something similar. What kind of power are you getting out of the amp? BTW I have a lot of experience with the 6N6P and love it. I'd suggest putting a CCS as a load, set it at 20-25ma, and use two LEDs to bias it at -4V. That will give the driver more headroom for the source, and move the operating point to a more linear part of the curves.twystd
Edits: 09/19/14
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