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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

How to balance a Cathodyne phase splitter?

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#41
wiseoldtech said:
Wrong again sir, sorry. In "proper" design of a cathodyne splitter, the biasing of the tube is taken from the top of the cathode resistor, not the ground end as you apparently think. Do a little research of known (commercial) circuits, and you'll soon understand the workings better.
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I've never said that. And I well know the bias is always referenced from the cathode potential, regardless of what's connected to.

Anyway, this is going nowhere. I'll now let the OP making his well informed decision.
 
#42
jjasniew said:
>>The best way is to do it by the plate, in this case a 80K resistor followed by a 50K pot would do it.

Darn. I already have a pack of 100K linear dual pots on hand. I'll see if I can get them to work; i.e. identifyable, repeatable setting positions for 2nd null, 2nd pronounced. That might be a while!
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I warn you, your intentions are going against good design practice.
Go search around for Altec Lansing, RCA Victor, Harman Kardon, HH Scott, Sylvania/GTE, Stromberg Carlson, Fisher, Heathkit, and many more - you'll find that the designs are all similar - adhering to industry standards of good design, not some internet driven blabber which I see often from non-techs with silly ideas.
 
#43
"I warn you..." LMAO
I'd love to see your credentials / resumé, WOT. I've NEVER seen a balancing pot in the cathode of ANY amplifier, DIY or otherwise, but I've seen plenty of balancing pots in the plate circuit.

Perhaps you can link some schematics from "industry standards of good design"...
 
#46
kodabmx said:
"I warn you..." LMAO
I'd love to see your credentials / resumé, WOT. I've NEVER seen a balancing pot in the cathode of ANY amplifier, DIY or otherwise, but I've seen plenty of balancing pots in the plate circuit.
Perhaps you can link some schematics from "industry standards of good design"...
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That's fine. Look up: (google or HIFI engine, take your pick)

Fisher model SA 16, and the SA 100 amps, for starters. There are more, of course.

As far as plate circuit balancing pots in "other amps", that's due to using twin triode type of splitters, not a single cathodyne style. I thought that's what we're discussing here.... cathodyne converters.
 
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