El34 to 6V6 conversion

didi · 09-22-2009, 10:25 PM

HI ALL!
I have a JCM900. i would like to convert the stock EL34's to 6V6's
I wanna do this in order to bring down the power output a bit. I suppose i would have to set the impedance selector switch one down? ANYWAY, Does anyone have a procedure do this? Any help will be much appreciated!!

olddawg · 09-22-2009, 10:31 PM

Quote:

Originally Posted by didi

HI ALL!
I have a JCM900. i would like to convert the stock EL34's to 6V6's
I wanna do this in order to bring down the power output a bit. I suppose i would have to set the impedance selector switch one down? ANYWAY, Does anyone have a procedure do this? Any help will be much appreciated!!

Yellow Jacket adapters?

porge · 09-23-2009, 02:08 AM

I've done a similar conversion with my Hiwatt, and it was as simple as re-biasing. I set them up for about 10w. Very pleased with the results, and it might work with your Marshall, but I'm not so sure. Some important caveats:

Use JJ 6V6's - they can withstand the abuse.
Your plate voltage needs to be within the range a 6V6 will take. (The Hiwatt was 470 - I guess the marshall is much higher)
Expect lower tube life expectancy.

When I was told aout this conversion, I was told If using an 8 ohm speaker load, set the output impedance for 4 ohm.

09-22-2009, 10:25 PM	#1
didi Junior Member Join Date: Sep 2009 Posts: 8	El34 to 6V6 conversion HI ALL! I have a JCM900. i would like to convert the stock EL34's to 6V6's I wanna do this in order to bring down the power output a bit. I suppose i would have to set the impedance selector switch one down? ANYWAY, Does anyone have a procedure do this? Any help will be much appreciated!!

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09-23-2009, 02:08 AM	#3
porge Junior Member Join Date: Jan 2007 Posts: 14	I've done a similar conversion with my Hiwatt, and it was as simple as re-biasing. I set them up for about 10w. Very pleased with the results, and it might work with your Marshall, but I'm not so sure. Some important caveats: Use JJ 6V6's - they can withstand the abuse. Your plate voltage needs to be within the range a 6V6 will take. (The Hiwatt was 470 - I guess the marshall is much higher) Expect lower tube life expectancy. When I was told aout this conversion, I was told If using an 8 ohm speaker load, set the output impedance for 4 ohm.

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