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In Reply to: RE: DHT "El Cheapo" posted by Eli Duttman on March 12, 2017 at 20:27:20
It's no longer 'el Cheapo' once you start stuffing rare and valuable tubes into such a circuit
You would be better off looking up the 6P23P which has 11 watt dissipation and mu of 8 (rather than mu of 5.6 for the 46) . It should drop straight in (apart from using lower value grid leaks) and costs a few dollars a piece . I would recommend a separate filament transformer though for the 6P23P . More power , cheaper and more repeatable than a 46 , surely worth a try :)
ps Avoid DN2540 cascodes , high impedence but not across the whole audio band as not particularly low capacitance . use a DN for the top but look into more suitable devices for the lower such as a JFET
George
Follow Ups:
The published works of Gary Pimm suggest drawing a different conclusion about the DN2540 MOSFET's when used in cascode.
Also, it is the upper one that could use improvement; a 10Mxxx chip has a lot more voltage gate-to-source( effectively; I realize they are multi-element chips ) and that exta voltage for the DN2540 to work under is useful in cutting capacitance...as well as offering up to 900V across it when the right model is chosen.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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