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In Reply to: Help, the right channel of my 45 tube amp is out posted by audiowill on April 1, 2007 at 22:36:50:
Hello,The rectifier should be fine, otherwise there would be no sound from either channels.
It could be the tube pin conncetions, or coupling cap going bad.
Test if there is continuity between the leads leading to tube pins and the pins themselves. Check if the caps in that channel are shorted or not. Check the resistors values. Check if the OPT is shorted. If you do not know the original values, compare one side tho the other, and if there's a difference, you have found the culprit.Good luck!
Janos
Follow Ups:
I know that you must be scared to try the amp again, but troubleshooting is easy on SE amps. If you think that your speakers are in danger(very unlikely with 2 watts)try a different pair, less costly.
Swapping the tubes from one side to the other, one tube type at a time, might clear this question up, quickly. If swapping the 45s brings the noise(or silence, now) to the other channel, voila, it's that tube that was now tried in the known good channel.
Likewise, swapping each stages' 417A, you might find the culprit.
This is before you dive underneath and check voltages. This way, you can simply call the tech and, hopefully, only need a tube.
If you want to try troubleshooting voltages, let us know. Resistances must be checked with the unit off...
Great point: if a channel goes out, never hook up the other speaker! Maybe the amp has blown/damaged the speaker, and when you hook up the other of the pair, that one will be also blown. And vice versa: when you hook a blown speaker to the working channel, if it shorts the channel, the OPT will be damaged.
Always keep a pair of RS speakers (or plain drivers) to hook them up if you suspect something.good luck,
Janos
Read the OP. *I tried switching the input and output tubes but there doesn't seem to be a problem with them.* = he already tried that.
Did you try swapping the left and right signal cables feeding the amp? This has been a problem for me more than once.
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