• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Need help with circuit operation. Please.

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G

G

Member
Joined 2002
Hi Guys,

I'm interested in using this schematic but I don't follow how the gain stage/phase splitter is operating. As far as I can tell the gain stage/phase splitter does not have a DC reference on the cathodes only an AC reference. I see a 100 ohm resistor between the cathodes with a 100uF cap from one side of the resistor to ground. Is this a mistake in the drawing or do I not understand what I'm looking at (most likely)? Can anyone explain the operation of this stage? I would appreciate it much.

G
 

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fdegrove

fdegrove

diyAudio Senior Member
Joined 2002
THE WHOLE PICTURE....

Hi Gavin,

Yes,circuits like this can get a bit confusing....
Thing is you see grounding is taken,with B+ for the preamp to a separate chassis.
So as long as you don't see these two as a pair it won't make much sense.

The amp as shown get its signal straight into the phase splitter and that drives the output stage.

Cheers,;)
 
fdegrove

fdegrove

diyAudio Senior Member
Joined 2002
FAIR ENOUGH

Howdy,

True,it won't prevent the amp from functioning.
OTH it won't hurt to play it safe either.

The 470K input R can easily be replace with a 500K volpot and you're set.

I must say I quite like the elegant simplicity of that amp.

Cheers,;)
 
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