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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum |
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#1 |
diyAudio Member
Join Date: Dec 2011
Location: Italy
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Hi guys , a friend gave me some GU29 tubes , so i want to make a stereo amp with them.
I've a pair output transformers from "Geloso" amplifiers , designed for EL34 in Push Pull , can I use them for gu29 in push pull ? B+ at 400Vdc What is the ideal Raa for GU29? 5k ? Can you suggest a good sounding tested schematic? Audioromy ? Thanks |
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#2 |
diyAudio Member
Join Date: Jan 2011
Location: Vinnytsya
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#3 |
diyAudio Moderator
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nice sounding tube, i had a chance to repair an Audioromy....it can still be optimized...
5k push-pull will work, the problem with this tube is idle current bias matching on the plates, this you have to watch out for....o got red plate on one side of a new tube....
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#4 | |
diyAudio Moderator
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Quote:
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#5 |
diyAudio Member
Join Date: Nov 2006
Location: Munich, Bavaria
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Raa depends on Ua and Ia.....
Hope you have a big stash to find a few with matching systems (especially in gm, static match can be adjusted via bias voltage)
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#6 |
diyAudio Member
Join Date: Aug 2002
Location: Eire
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Can I suggest you look at my DC7 Mk3 thread to see a way of biasing up a shared cathode output tube. Its self adjusting and stable if the input valve stays reasonably well matched.
Shoog |
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#7 |
diyAudio Moderator
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links please...
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#8 |
diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile, |
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#9 |
diyAudio Moderator
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thanks...
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#10 |
diyAudio Member
Join Date: Aug 2002
Location: Eire
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Thread | Thread Starter | Forum | Replies | Last Post |
GU29 damaged | piero7 | Tubes / Valves | 19 | 16th November 2011 07:30 AM |
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