RE: Simplest Use of interstage transformer @ HF-87

Posted by Palustris (A) on December 22, 2010 at 18:29:17

In Reply to: RE: Simplest Use of interstage transformer @ HF-87 posted by DAK on December 22, 2010 at 16:49:59:

Yes, that's exactly what I illustrated above. The 6J5 is half a 6SN7 so it would be practical to use a couple of 6SN7s for your stereo amp. You can use the 9 pin socket for a 6CG7 and pretty much use the circuit topology shown above. With a pentode or tetrode you need the feedback to lower the output impedance and it can be tricky. You would probably have to go with op tube to driver local feedback.

If you really want to get adventuresome you could use 6B4 or 6A5 triodes in your amp. You wouldn't have to worry about the feedback and they would plug right into your octal sockets. The sockets would need to be rewired of course and you would need two 6.3V filament transformers, one for each pair of triodes. But you really have to have some basic knowledge of electronics in order to set the amp up so the tubes were all biased properly and to troubleshoot the inevitable problems.

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Follow Ups Full Thread

Topic - Requirements for an interstage transformer - DAK 15:53:10 12/20/10 (17)

RE: For HF-87 stick with Long Tail PS - JKT 16:03:40 01/25/11 (0)

RE: Requirements for an interstage transformer - Stuben 18:05:25 12/26/10 (1)

RE: Requirements for an interstage transformer - DAK 09:02:06 12/27/10 (0)

adding a CCS to the 6SN7 LTP is a better first step.... - Jim Doyle 16:21:27 12/22/10 (4)

RE: adding a CCS to the 6SN7 LTP is a better first step.... - Jim Doyle 14:36:33 12/24/10 (0)

RE: adding a CCS to the 6SN7 LTP is a better first step.... - DAK 18:18:57 12/22/10 (2)

RE: adding a CCS to the 6SN7 LTP is a better first step.... - DAK 01:24:11 12/24/10 (1)

RE: adding a CCS to the 6SN7 LTP is a better first step.... - Stuben 18:15:26 12/26/10 (0)

Requirements for an interstage transformer - Interstage Tranny 18:26:25 12/20/10 (8)

RE: Requirements for an interstage transformer - DAK 19:24:39 12/20/10 (7)

RE: Requirements for an interstage transformer - Palustris 08:28:51 12/21/10 (6)

RE: Requirements for an interstage transformer - DAK 13:58:02 12/21/10 (5)

Simplest Use of interstage transformer @ HF-87 - Interstage Tranny 15:13:42 12/21/10 (4)

RE: Simplest Use of interstage transformer @ HF-87 - DAK 16:52:55 12/22/10 (0)

RE: Simplest Use of interstage transformer @ HF-87 - Palustris 17:48:35 12/21/10 (2)

RE: Simplest Use of interstage transformer @ HF-87 - DAK 16:49:59 12/22/10 (1)

RE: Simplest Use of interstage transformer @ HF-87 - Palustris 12/22/1018:29:17 12/22/10 (0)

Follow Ups

RE: Simplest Use of interstage transformer @ HF-87 - Palustris 12/22/1018:29:17 12/22/10 (0)

RE: Simplest Use of interstage transformer @ HF-87

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