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Post subject: 5150 III - 4 months later major volume drop on red channel
Posted: Mon Dec 18, 2017 1:10 pm
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Joined: Mon Dec 18, 2017 12:59 pm
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Hi all!

So I've owned my awesome 50w 5150 III for just over 4 months. The amp has been flawless (the exception being the volume jump between green-blue).

My problem is that just recently I was jamming on the blue channel (volume < 1) and I switched to the red channel and it was ridiculously low. I had to crank it up to 6 to hear it...which would normally register as an earthquake.

I have never moved the amp, I don't gig, and I've never raised the volume over 2.

Is it a preamp tube do you think? Since the blue/green channels aren't affected at all its not the power tubes correct?

On another semi-related experience can I replace the power tubes with something that has a similar sound as the EL-4s? I know I can use EL-4s with this head.

Thank you,
Ron


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Post subject: Re: 5150 III - 4 months later major volume drop on red chann
Posted: Tue Dec 19, 2017 9:46 am
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14047
Location: Province de Québec, Canada
Schematic don't talk about channel colors only Ch1, Ch2....

You can put 12AX7 tubes from a good channel and put on the channel don't work . You'll see wich tubes is / are bad

Tube V1 is for ch1, 2 ,3
V2,V3,V4 for ch3
V5,V6 for Ch1, Ch2

tubes layout ;
http://support.evhgear.com/schematics/E ... ctions.pdf


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