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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: PP1 as pentode with local feedback posted by pipo on April 3, 2007 at 00:24:00:
... to get more gain ?Yes. I tried local feedback as you describe for many years on and of - but always came back to no feedback with triodes. But if you (insist) on using pentode connection then it will be a big help - and certaainly will sound far better than using loop feedback!
Be aware that with the 100k F/B r's in place - your anode voltage will go up and you may need to change the running current to ensure the driver anode V is still at the optimum level for maximum driver swing and minimum distortion.
Regards, Allen
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Follow Ups
- "Can I lower the 470 ohm resistor in the tail of the cascodes... - Allen Wright 05:15:37 04/03/07 (9)
- Local Loop feeback - maxhifi 12:55:12 04/03/07 (8)
- Re: Local Loop feeback - Ron Oehlert 15:06:23 04/03/07 (7)
- I disagree with this point. - Allen Wright 01:20:30 04/04/07 (6)
- "The RDH states: A transformer's distortion is zero if the driving impedance is also zero..." - kurt s 14:20:47 04/05/07 (0)
- OT inside a feedback loop - Gingertube 20:50:28 04/04/07 (2)
- More rave - he must be bored - Gingertube 21:13:31 04/04/07 (1)
- On-yah, Ginge! (nt) - Allen Wright 01:20:11 04/05/07 (0)
- Zero distortion... - Triode_Kingdom 13:12:59 04/04/07 (1)
- You'll have to read it for yourself... - Allen Wright 01:21:38 04/05/07 (0)
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