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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: What PP amp to build? posted by speleo on April 2, 2007 at 06:47:34:
Dude,Other posters have skipped over your Octal small signal tube request for a reason. The triode(s) used in a phase splitter should be high gm/low Rp. AFAIK, nothing Octal really fits that pattern, but the 6SN7 comes close. You are going to get very little gain from a 'SN7 wired up as a differential phase splitter. So, you will need an effective voltage gain block in front of the splitter. A choke loaded 6SL7 in SRPP will do the job.
The 'SL7 SRPP is linear enough as is. You will need loop NFB only around the splitter and "finals". You can "clone" the basic topology used in "El Cheapo" for splitter and "finals".
Use a pair of 6AU4 damper diodes as the B+ rectifier. Voltage multiply the 5 VAC winding to get the B- rail.
Eli D.
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Follow Ups
- Re: What PP amp to build? - Eli Duttman 17:36:10 04/02/07 (1)
- Splitter? - Ray Moth 01:12:40 04/03/07 (0)
- Re: Splitter? - Eli Duttman 01:45:00 04/03/07 (0)
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