Mizati20
New member
Hey fellas, I'll keep this short and sweet...recently picked up a VH-4...2012 model that is amazing...
Channel 4 is uncontrollably noisy... even with a Pro Rack G running in front of the amp and in the loop is can barely control the squealing and feedback, not to mention just the high gain "hiss" overall is exceptionally loud... for reference this is with the channel volume around 2 o'clock, and the master at maybe 9 o'clock... channel 3 also has a fair more hiss than other versions I have owned...
Please keep in mind I know this is a very high gain channel, and some hiss is to be expected, but I have owned 5 of these things, and have enough experience with these heads to know this is absolutely abnormal compared to the others I have owned...
I did a search on the forums on stock preamp tubes and found mixed results, I pulled the chassis and checked all the tubes and wrote down all the lettering on them, they are as follows..
(Assuming V1 is closest to the guitar input)
V1 : Ruby 7025SS/ 12AX7A
V2 - V7 are all the same : Ruby 12AX7AC5
Are these the stock preamp tubes?
Power tubes are JJ KT77's but I doubt those are the issue...
Any input and advice would be absolutely fantastic, thanks fellas!!!
Channel 4 is uncontrollably noisy... even with a Pro Rack G running in front of the amp and in the loop is can barely control the squealing and feedback, not to mention just the high gain "hiss" overall is exceptionally loud... for reference this is with the channel volume around 2 o'clock, and the master at maybe 9 o'clock... channel 3 also has a fair more hiss than other versions I have owned...
Please keep in mind I know this is a very high gain channel, and some hiss is to be expected, but I have owned 5 of these things, and have enough experience with these heads to know this is absolutely abnormal compared to the others I have owned...
I did a search on the forums on stock preamp tubes and found mixed results, I pulled the chassis and checked all the tubes and wrote down all the lettering on them, they are as follows..
(Assuming V1 is closest to the guitar input)
V1 : Ruby 7025SS/ 12AX7A
V2 - V7 are all the same : Ruby 12AX7AC5
Are these the stock preamp tubes?
Power tubes are JJ KT77's but I doubt those are the issue...
Any input and advice would be absolutely fantastic, thanks fellas!!!