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Posted by Paul Joppa (P) on May 31, 2006 at 18:49:39

In Reply to: WE-91B style coupling posted by Single_Ended on May 30, 2006 at 16:01:01:

Thorsten had this to say:

"...The odd looking circuit between the cathode of the 300B and the 300B gridleak resistor is also original WE, it is a form of positive feedback that overcomes the limited LF frequency response cause by using fairly small value (but high quality) cathode bypass capacitors. In the old days large value capacitors where too large and expensive, today the same holds true for high quality types, hence this circuit still has use. Note it only works with penthode drivers or in specific configurations with interstage transformers, no point adding it to a triode driver amplifier."

• Thorsten's post on TubeDIY   (Open in New Window)

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