Channel death - Chinese EL34 PP

theskintman · 10th July 2010, 02:06 PM

I have a Chinese EL34 PP amp that had recently developed a problem with the right channel. Even with the volume at the lowest setting, it still put sound out of the right channel. The difference between left & right seemed to reduce as you raised the volume, but I'm not certain. Now, the channel has died completely.

I have no real idea what I need to do to fix it, but I've had a look inside and can't find any weak solder joints so I guess a component has died and needs replacing.

I am hoping someone here could give me some pointers on how to go about testing what has failed. I come armed with multimeter but little else...

A photo of the innards is below:

DSCF2989.jpg - ImageHost.org

planet10 · 10th July 2010, 03:00 PM

The 1st thing i'd look at would be the pot.

dave

azazello · 10th July 2010, 05:41 PM

Hi,....Can You measure U on every blue cathode capacitors on EL34 and every small
red vertical capacitors on prestages tubes?

10th July 2010, 02:06 PM	#1
theskintman diyAudio Member Join Date: Feb 2007 Location: Suffolk, UK	Channel death - Chinese EL34 PP I have a Chinese EL34 PP amp that had recently developed a problem with the right channel. Even with the volume at the lowest setting, it still put sound out of the right channel. The difference between left & right seemed to reduce as you raised the volume, but I'm not certain. Now, the channel has died completely. I have no real idea what I need to do to fix it, but I've had a look inside and can't find any weak solder joints so I guess a component has died and needs replacing. I am hoping someone here could give me some pointers on how to go about testing what has failed. I come armed with multimeter but little else... A photo of the innards is below: DSCF2989.jpg - ImageHost.org

10th July 2010, 03:00 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	The 1st thing i'd look at would be the pot. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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10th July 2010, 05:41 PM	#3
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	Hi,....Can You measure U on every blue cathode capacitors on EL34 and every small red vertical capacitors on prestages tubes?

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