2011 CF Tube Amp Questions

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2011 CF Tube Amp Questions

Post by Dennis47 » Mon Feb 25, 2019 8:17 pm


I'm thinking about purchasing this 2011 CF EL84 Tube Amp, but have the following questions
that, hopefully, someone can answer for me.

There is a 3 way toggle switch on the rear (between RCA's & speaker terminals),
I'm thinking it is a control for stereo/mono modes. Would that be correct? If not
what is it's function?

I can't tell from the tubes if this is wired for 6AX7 or 12AX7 tubes. The only ID
on the driver tubes is OTK7 9201. I think this is a vintage designation for Russian
Vokhod. Would that be true? Can the tube voltage be ascertained either by the
tube or by the pin wiring?

Thanks for the help.... #-o :-k
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Re: 2011 CF Tube Amp Questions

Post by hewlew1 » Mon Feb 25, 2019 8:44 pm

Dennis, I would agree as to the 3way switch. I can not tell by the pics as to 6ax7 or 12ax7 heater wiring. I will say that a lot of these amps were customized to the owners preference.. For example none of mine have a rear mounted power switch I chose to Install a B+ fuse holder in its place on mine. My power switch is mounted on the face and is illuminated also I installed an indicator light on the front of mine which lights when the amp is functioning as a monoblock. Just an FYI
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Re: 2011 CF Tube Amp Questions

Post by Dennis47 » Mon Feb 25, 2019 10:27 pm


Thanks for the info.

Love what you've done with your amp...especially the wood side rails
and front power/indicator lamps. Very nice workmanship! =D>

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Re: 2011 CF Tube Amp Questions

Post by Ben D. Rinkin » Tue Feb 26, 2019 2:10 am

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Re: 2011 CF Tube Amp Questions

Post by Magnaryder » Tue Feb 26, 2019 10:37 am

Looking at the pics you provided I'd guess its a stereo/mono switch. Angelo's Work? Nicely done. There will be a jumper between 2 of the pins on the driver tubes, I couldn't make it out from the pics provided. This would raise the voltage to 12 volts instead of the 6 volts of the original design.


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