Hello, I've never retubed before and have a couple questions for the experts!
I bought new tubes (tungsol 6l6gc str, tungsol 12ax7, electro harmonix 12at7) for my red knob fender dual showman, and when I went to set the bias/balance I had way to much voltage on the balance. The back of the amp says it should be 0v and I'm at 9.7v. Here are some pictures of the amp and what I was doing:
The tubes read Ip: 39 and Gm: 4,300 for all 4, is this too high for this amp?
Having 9.7v difference for the balance, will that hurt my amp? Also I'm wondering about the impedance of my cabinet there, the amp is set at 4ohms right now, how can I verify that is the correct setting?
Any advice would be great! Thanks
-Ian
I bought new tubes (tungsol 6l6gc str, tungsol 12ax7, electro harmonix 12at7) for my red knob fender dual showman, and when I went to set the bias/balance I had way to much voltage on the balance. The back of the amp says it should be 0v and I'm at 9.7v. Here are some pictures of the amp and what I was doing:
The tubes read Ip: 39 and Gm: 4,300 for all 4, is this too high for this amp?
Having 9.7v difference for the balance, will that hurt my amp? Also I'm wondering about the impedance of my cabinet there, the amp is set at 4ohms right now, how can I verify that is the correct setting?
Any advice would be great! Thanks
-Ian
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