RG50TC hum/cracking while switching between the channels

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ljbomir

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Jun 26, 2011
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Sofia, Bulgaria
Hello everyone,

I have a problem with my amp. I didn't find the right answer and i hope you would help me.

When i switch between the gain1 and gain2 it appears a big hum/cracking. The cracking noise increase with the volume increase,
Especially when the level of the guitar is low. Increasing the guitar level decreases the cracking while switching.
You can hear the awful cracking at the high volume on the following link: http://www.youtube.com/watch?v=Px9MII3HBeE
I changed the preamp tubes each other however with no result.
All the tubes are not replaced about four years and came with the amp.

Do you have any idea ?

Best Regards !
 
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