Any common cathode (grounded grid) schematics? - diyAudio
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Old 23rd February 2006, 10:14 PM   #1
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Default Any common cathode (grounded grid) schematics?

Before you say "use the Search button" or "try Google" let me explain. I am interested in designs of what Broskie calls "common cathode" as shown here
http://www.tubecad.com/2005/April/blog0042.htm
Click the image to open in full size.
not just a plain grounded cathode stage which many also refer to as common cathode. It's very similar to the Rosenblits grounded grid minus 1 triode I guess. I think the terminology is tripping up my attempts to research. Any help appreciated.
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Old 24th February 2006, 06:49 AM   #2
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What you have there is a "long tail pair" with the output taken from only one anode (if you took the output from both anodes, it would be a phase splitter).

I have never tried the (non-splitter) version of this circuit that you show; however, from memory, it's highly regarded by those who would know, presumably for its power supply rejection ratio (PSRR - posh way of saying low hum), low distortion and stable gain. It also gives a non-inverted output, unlike the more conventional common cathode amplifier, if that's important to you.
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Old 24th February 2006, 07:29 AM   #3
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but this one looks different huh.. the first triode's anode is bypassed to ground by a 100uf cap... and there seems to be a feed back network on the 2nd triode..!
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