Have this device ride on a goooood CCS. Again the Guinevere plate loads will do well, and this time we *WILL* build the complete thing. Set it to sink 10 mA.
Attach the volum pot's wiper to the lower gate, and cap couple from its source( as in Guinevere ).
Supply a +/- 60V set of rails and we're off...low output Z, wideband response, and no silly high voltage capacitors needed.
For parts, a 120V CT power TX, two 10 Hy/100 mA chokes and two good capacitors are all that's required. Figure $100 max if you don't want a gold-plated box...
regards,
Douglas
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Since I have a feeling that there is substantial prejudice against SS stuff, I thought to show a way it could be used to good effect. Always use the best design to solve the problem. Sometimes it might just be a SS one. FWIW, I don't recall anybody complaining about the performance Guenivere delivered.
regards,
Douglas
The suggested PS of 60-0-60 would yeild ~50 volts at the L-C filters.
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There is a certain satisfaction to be gained in favourably comparing to something far more expensive and Off-the-Rack, no?
regards,
Douglas
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For the input circuit, a triode strapped 6EJ7 and a pentode rigged 6EJ7 would be great. ~$3/tube too
Now for the CCS for this cascoded cathode follower to work into. Single pentode perhaps? 6CL6 or an EL84 or any of the similar sized 9-pin pentodes would do. One could get nuts with a regulated g2 supply, but a dropping R and bypass C would be quite good as well.
The beauty of the MOSFET sol'n is that we could do it with +/- 30V and DN2540N5's. Or a -30 supply with a MOSFET cathode load and valves on top. This I am going to build soon. I have a request from a very good friend back in PA for just such an item. I think I'll do it with Intact Audio ( Dave Slagle ) Autoformer volume controls if he'll foot the bill...
regards,
Douglas
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The PS will yeild about +/- 40V. I think I'll try a 10 mA idle current for less than 1/2 Watt dissipation per top MOSFET and run w/o heatsinks.
I have everything but the plate to mount to. Looks like a nice simple job at this time now. I can't wait to get it underway so I can put it In-System and see how it compares to the All-Valve version.
See anything I missed? Diodes? Anybody have some nice diodes? 200 PIV/2A Schottkey?
mmmhhhhh, no heaters!
regards,
Douglas
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That's true of most fundamental concepts, but entirely irrelevant. Solid-state designs are inappropriate to this forum.
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Well, you're entirely entitled to your opinion, no matter hwo wrong it appears to me.
So where do you draw the line for being Tube PC( assuming that the term is even valid ).
regards,
Douglas
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Maybe that other guy is so cranky because his turntable is eating up his precious vinyl? Go get a thorens man...jeez even a dual.
You know who
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Who knows who
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...Sister Alice Cathode
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