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#1
Posted to rec.audio.tubes
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Patrick Turner's SE845 Class A2 Amplifier
I have the second circuit you sent, Patrick, the one you have had
running for a few months. That one seems ready for primetime, if very complicated. (I recently did a series of amps with a split rail, and just automatically made it symmetrical.) Why not publish your 845 amp and lead us through it step by step, making separately named subthreads for the introduction and for each stage so that the whole thread doesn't bog down in one person's incomprehension or stubbornness, as happens too often with interesting threads. Andre Jute Visit Jute on Amps at http://members.lycos.co.uk/fiultra/ "wonderfully well written and reasoned information for the tube audio constructor" John Broskie TubeCAD & GlassWare "an unbelievably comprehensive web site containing vital gems of wisdom" Stuart Perry Hi-Fi News & Record Review |
#2
Posted to rec.audio.tubes
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Patrick Turner's SE845 Class A2 Amplifier
"Andre Jute" wrote in message oups.com... I have the second circuit you sent, Patrick, the one you have had running for a few months. That one seems ready for primetime, if very complicated. (I recently did a series of amps with a split rail, and just automatically made it symmetrical.) Why not publish your 845 amp and lead us through it step by step, making separately named subthreads for the introduction and for each stage so that the whole thread doesn't bog down in one person's incomprehension or stubbornness, as happens too often with interesting threads. An 845 amp from Patrick? That sounds like a perfect thread for the Autumn. Iain |
#3
Posted to rec.audio.tubes
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Patrick Turner's SE845 Class A2 Amplifier
Andre Jute wrote: I have the second circuit you sent, Patrick, the one you have had running for a few months. The schemo I sent is only provisional, and has never run. Its been on my mind for the 18mths since I began the project. Its the basic thing that will need to be de-bugged following initial trials, and that will mean slight changes to voltages and part values. Since virtually all my provisional designs have worked as proposed then i reckon this one will too. That one seems ready for primetime, if very complicated. (I recently did a series of amps with a split rail, and just automatically made it symmetrical.) Why not publish your 845 amp and lead us through it step by step, making separately named subthreads for the introduction and for each stage so that the whole thread doesn't bog down in one person's incomprehension or stubbornness, as happens too often with interesting threads. If anyone is able read schematics then they will easily figure how it all works, just two very simple CR coupled cascaded gain stages, one optional CF buffer for A2 op, and then 845/211 output tube or pair of parallel tubes using about +850V and -350V rails. The split rails allow the OPT to idle with only +850V present, and the P-S insulation isn't seriously challenged as it would be with say 1,600V if I did a Mills derived circuit with everything "standing on" 0V as the basic rail. I have one more re-engineering job on an ARC VT100 to finish, and then I can spend a month on the 845 project. I sold a pair of speakers today, so between now and Xmas I can return to completion of 3 big projects, the 845 50 watters, the ESL speakers I began and failed to complete last autumn, and to complete another pair of 300 watters, now about 3/4 finished. Maybe in 2027, I will find time to take a break.... Patrick Turner. Andre Jute Visit Jute on Amps at http://members.lycos.co.uk/fiultra/ "wonderfully well written and reasoned information for the tube audio constructor" John Broskie TubeCAD & GlassWare "an unbelievably comprehensive web site containing vital gems of wisdom" Stuart Perry Hi-Fi News & Record Review |
#4
Posted to rec.audio.tubes
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Patrick Turner's SE845 Class A2 Amplifier
Iain Churches wrote: "Andre Jute" wrote in message oups.com... I have the second circuit you sent, Patrick, the one you have had running for a few months. That one seems ready for primetime, if very complicated. (I recently did a series of amps with a split rail, and just automatically made it symmetrical.) Why not publish your 845 amp and lead us through it step by step, making separately named subthreads for the introduction and for each stage so that the whole thread doesn't bog down in one person's incomprehension or stubbornness, as happens too often with interesting threads. An 845 amp from Patrick? That sounds like a perfect thread for the Autumn. My darn Springtime. Patrick Turner Iain |
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