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10th November 2009, 01:53 AM
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#1 |
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diyAudio Member
Join Date: Mar 2008
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power supply
I wish to build a stereo vacuum tube amp using 6V6 output tubes. The schematic calls for a transformer at 700 volts center tapped. I have an 800 volt CT transformer. Can I use this transformer with some modification?
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10th November 2009, 02:50 AM
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#2 | |
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diyAudio Member
Join Date: Apr 2004
Location: Plainsboro, NJ
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Quote:
You should be able to do just fine for 6V6 "finals", with the 400-0-400 power trafo you already have. If you SS rectify and choke I/P filter the B+, the rail voltage will come at about 360 V. That rates to be fine for self biased 6V6s.
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Eli D. |
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10th November 2009, 03:27 AM
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#4 |
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diyAudio Member
Join Date: Oct 2004
Location: Maui, Hawai'i, USA
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10th November 2009, 03:32 AM
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#5 |
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diyAudio Member
Join Date: Aug 2009
Location: Johnson City, TN
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Hmmm....
I don't think "a cool red glow on the 6V6 plates" is such a good idea. Seems I read somewhere that this indicated one was exceeding the recommended plate dissipation and would lead to shortened tube life. But, I probably read it on the internet so ignore me..... |
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12th November 2009, 01:05 AM
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#6 |
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diyAudio Member
Join Date: Apr 2004
Location: Plainsboro, NJ
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The OP's reference schematic is here.
That's a mono amp. The remark about red plates being bad is CORRECT. The 6V6 should be biased at about 23 V. and power O/P is about 15 W. The circuit shown follows the Scott/Dyna pattern of pentode voltage amplifier and "concertina" phase splitter. Notice the "Cheap Charlie" bias supply. Bob, per my 1st post, you can use the power trafo you have. Switching from "fixed" to self bias is in order. Is a stereoblock build part of the plan?
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Eli D. |
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12th November 2009, 01:09 AM
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#7 |
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diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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PSUDII is your friend - model it...
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Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012 |
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12th November 2009, 01:21 AM
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#10 | |
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diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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Quote:
__________________
Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012 |
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