Hi, I've made a DC coupled 2A3 using stacked power supplies. I think it's easier since both supplies are independent so you can tailor them as you like
The drawback is of course you need to use 2 power transformers or have a custom-wound transformer with 2 high voltage windings.
Reza
The drawback is of course you need to use 2 power transformers or have a custom-wound transformer with 2 high voltage windings.
Reza
revintage, are you sure you want B+ on the grids of the output tubes?
Also, the freq response on the plate of the input tube will not match the output side of the autoformer... nor in terms of phase...
_-_-bear
Also, the freq response on the plate of the input tube will not match the output side of the autoformer... nor in terms of phase...
_-_-bear
How about gluca's schematic over at the Magnaquest forum?
My latest amp ...a push pull eventually - gluca - MagneQuest/Peerless Forum
tim
My latest amp ...a push pull eventually - gluca - MagneQuest/Peerless Forum
tim
Hey Bear,
Where did you get that from? Exactly as in Andys circuit there is about +120V on the grids.
Take your time and read the whole thread. If I´m not mistaken Dave made some IRL measurements on dual-chokes too.
One can see the concept as a refined DC-coupled variant on Magnequests Seth 2A3PP/6C45 S-240.
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Hem ... yes ... I made many variations of that kind of amp. CCS, stacked supplies, zeners/gas tubes ... a couple examples in the schemos below. I didn't build actually the amp with the 300B you see in that schematics but a couple have been built with 45's by friends of mine. more info are buried in discussions over the MQ forum, you need to change and adjust things but the basic idea is always the same
link to MQ forum
my latest amp, differential into differential, sounds better tho
link to MQ forum
my latest amp, differential into differential, sounds better tho
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