Tube DIY Asylum

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Original Message

Three ways to couple......

Posted by drlowmu on February 25, 2017 at 12:31:50:
Mikey,

Lets talk Class A1 triode amps, for high efficiency speakers.

Think about what the prior stage has to work into, and you can prioritize the three ways of coupling one tube stage to another :

WORST : Cap Couple, tube has to power a cap !!

LESS WORSE : Transformer Couple, not too bad at all

BEST - by FAR : Direct Couple, tube gets connected to next stage grid by a short length of high quality wire.

As far as transferring of the signal, the Direct Couple is many many times superior to ANY Cap Couple, in transferring and driving the next stage, in general terms.

Yes, there are engineering exceptions, but if you have a choice, ( for example, a two stage ONLY triode Class A1 amp ), it is hard to beat a DC !!

Jeff Medwin