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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: Can someone suggest me simple PP 30W or higher class A Amp Schematic ? posted by calico on August 28, 2006 at 06:52:36:
To paraphrase Einstein, not too simple or it will not work.Triode wired KT88s will give you 30 W. and stay in Class "A" almost all of the time. By the time Class "B" operation sets in, things will be NOISY.
An ECC99 wired as a differential phase splitter that has a CCS in its "tail" will have NO problem in driving the KT88s. A SMALL amount of loop NFB from the O/P trafo secondary to the non-inverting grid of the splitter is good for damping factor and corrects O/P trafo aberations.
Pick a not so linear triode, like the 12AT7 or the 6J6, for the voltage gain block. Don't bypass the cathode bias resistor. The small amount of 2nd HD produced mates WELL with PP finals, which cancel internally generated even order HD.
Eli D.
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Follow Ups
- Re: Can someone suggest me simple PP 30W or higher class A Amp Schematic ? - Eli Duttman 09:12:51 08/28/06 (8)
- Here is an example of what Eli mentioned... - Bas Horneman 15:54:43 08/28/06 (7)
- Re: Here is an example of what Eli mentioned... - calico 22:28:58 08/28/06 (0)
- Re: Here is an example of what Eli mentioned... - calico 18:26:03 08/28/06 (0)
- More ... - Eli Duttman 16:13:22 08/28/06 (4)
- Aren't the diodes in the b- the wrong way around? - Bas Horneman 01:29:44 08/29/06 (3)
- B- = bee minus = negative voltage - Ron Oehlert 11:38:51 08/29/06 (2)
- But I see now..what I thought was - was the +...so diodes are indeed good..thank. nt - Bas Horneman 11:52:33 08/29/06 (0)
- Connecting the "b+" of the b- to the 0 of the "real" b+ supply? nt - Bas Horneman 11:49:38 08/29/06 (0)
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