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Crazy newbie tube driver question
Crazy newbie tube driver question
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Old 13th July 2008, 08:22 PM   #1
john65b is offline john65b  United States
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Default Crazy newbie tube driver question

OK all, I have seen a few driver circuits to a PP Output (long tailed phase inverter, Cathodyne phase inverter)...but as I was looking at a Audionote M7 circuit with (I believe it to be a parafeed??), I was wondering if this was an option or possible... to feed a 6L6GC PP output section with 6sn7... disregard the values for the time being, just overall

Please forgive me if the if the question is totally ridiculous...
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Old 13th July 2008, 08:50 PM   #2
jerluwoo is offline jerluwoo  United States
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There will be no output for the cathode end because of the led bias. A led has very low on resistance, basically a short so no signal will appear across it. The led should be replaced with a resistor the same value as in the plate side. As for paralleling tubes, it should be fine as your are basically doubling drive current. Are you sure the circuit you saw is not a paraphase splitter instead?
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Old 13th July 2008, 09:07 PM   #3
john65b is offline john65b  United States
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OK. I can see that. So like this would be doable? Is there caveats to this type versus Cathodyne Phase splitter? Is bypass cap needed?
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Old 13th July 2008, 10:06 PM   #4
SY is offline SY  United States
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Crazy newbie tube driver question
The bypass cap will prevent this from working at all.

Before proceeding any further, I'd strongly recommend reviewing the section on phase splitters in Morgan Jones's "Valve Amplifiers." You can try all sorts of random things without really "getting" it, but if you understand the theory behind how a split load or long tail pair actually works, you're vastly more likely to come up with a successful scheme.
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Old 14th July 2008, 12:44 AM   #5
kevinkr is offline kevinkr  United States
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Crazy newbie tube driver question
Quote:
Originally posted by john65b
OK. I can see that. So like this would be doable? Is there caveats to this type versus Cathodyne Phase splitter? Is bypass cap needed?

Sy's dead right on his comments, and what you have is a broken cathodyne phase inverter.. (The bypass cap amongst other things breaks it.)

I'd add Jones's "Building Valve Amplifiers" to the list of recommended reading in addition to Sy's suggestion of "Valve Amplifiers." I strongly recommend a cover to cover read of both titles for all newbies, and many veterans of the tube wars as well.

You do know that you need appreciable voltage gain ahead of the splitter to drive your output tubes?

Read first, ask questions next, build last...
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Old 14th July 2008, 02:07 AM   #6
mashaffer is offline mashaffer  United States
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See phase inverter sections here
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Old 14th July 2008, 03:42 AM   #7
john65b is offline john65b  United States
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I will do so. I appreciate your comments.

Thanks
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