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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Innerstage vs R/C coupling.

My 2 cents...

IT's can be sound like a built in compressor sometimes. I find the use of these with horn systems can really shine. You also have to watch the build of IT's. Some are bifilar wound which means the polarity in must equal the polarity out or the design looses high end big time!

RC, problem with DHT's is that as you approach the bias point with the input signal, the R increases the voltage as the grid is drawing current. This rebiases the output and causes depleated output.

RC, pentode, problem here is usually R is low and C is high and there are not many good large C's out there for coupling... or they are $$$$

LC, I like grid choke as the Rdc of L is low so grid current is not an issue. Also the AC Z of the inductor is really high so you can use a relatively low C value.

J. Gordon Rankin

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