Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: separateness on July 26, 2026, 08:18:44 pm
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Any of you fellas ever seen a cathode follower with a plate resistor? See attached pic of an oil can unit schematic. I have a similar unit with a different branding and basically electronically identical except for that resistor and cap on the plate of the cathode follower. I was just wondering why they'd gone and done that.
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What tubes are those?
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What tubes are those?
one tube. 7199
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Standard grounded cathode amp, not a follower per-se. Signal tapped for lo-Z, low level output from from cathode. Like follower, output phase follows input phase.
EDIT: is also summing point for dry signal path.
--Pete
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What tubes are those?
one tube. 7199
Correct, I should have said this to begin with.
Standard grounded cathode amp, not a follower per-se. Signal tapped for lo-Z, low level output from from cathode. Like follower, output phase follows input phase.
--Pete
What exactly is the distinction there? The presence of a plate resistor?
How does performance differ? Is the gain diminished witht the plate resistor? I would assume so but what do I know. The echo recovery on my unit is identical aside from the plate resistor and cap. Do you it would be an improvement to implement the resistor and cap there?