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Hi, doesn't anyone have an idea what and where I should check? Thanks in advance for replying

Hi, I need your help, this concerns my express 5-25 amp. I can't get any further because there is a problem with the voltages on the two EL84s, and the bias current of the two EL84s are very different, although both tubes are matched. What remains to be said is that it is an export amp and is...

Thanks in advance for the answers but I can't get any further because there is a problem with the voltages on the two EL84s and the bias of the two EL84s are very different, although both tubes are matched. What remains to be said is that it is an export amp and is operated with 230 volts and...

Hi "wagdog", thank you for the explanation of the 5 watt mode. That already helped me. So it's better not to work too much with the 5 watt mode because that puts a lot more strain on one tube of the pair than the other tube. This is exactly what happened with my amp: one EL84 tube (the left one...

Hello, I appreciate your bias circuit and will install it soon. However, I have a question: if I switch the switch to 5 watts "class A", the bias current of the left tube goes up to 90mA, but the right tube only goes to 2mA! That's not normal, is it? The tubes are matched and are new, even if...