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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: RE: 300B IT 1:1 845, A2 possible? posted by Eric Chan on December 28, 2021 at 04:47:17:
I know A2 doesn't always sound bad, but the 801a looks bad. I have an 801a amp that I kept to A1 because of those findings, You get a very nice 6.4 watts easily, I am using interstage coupling.Our UK gathering Nick Gorham and I did a collaberation, he built the driver I brought the power supply and output stage 833a's
Nicks circuit is an adaptation to provide more current, so he put 6BX7 as driver. Its a level shifting circuit , bias adjustment on input valve so whole cirquit must float at input, we used a cap, could use input transformer, with voltage potential difference allowed.
the level shifting circuit is known as ACF-2. Its really mint sounding, don't dismiss it because its not modern and doesnt use niche valves. It sounds good and drives A2 grid current .
https://www.desmith.net/NMdS/Data/955_Augmented_Cathode_Followers.pdf
Edits: 12/28/21
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- RE: 300B IT 1:1 845, A2 possible? - Paul Barker 09:18:12 12/28/21 (0)
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