Hello everybody,
long time lurker and frist time poster here.
I have a fender twin reverb 65 on my bench that i've just retubed and something incredible has appened to me. The amp worked just fine, after changing power tubes and rebiasing the amp was dead, no volume. Rebiased again and put back the original tubes and the amp now has a little volume. Pulled the power tubes, and started checking the voltages, control grid was ok. As soon as i touched the anode pin of a power tube (no slip of probe at all), sparks started flying in the PT and the mains fuse blow. DC resistance on both the transformers look ok. What the hell! Can someone explain this to me? What has happened I've really no clue on such a thing
long time lurker and frist time poster here.
I have a fender twin reverb 65 on my bench that i've just retubed and something incredible has appened to me. The amp worked just fine, after changing power tubes and rebiasing the amp was dead, no volume. Rebiased again and put back the original tubes and the amp now has a little volume. Pulled the power tubes, and started checking the voltages, control grid was ok. As soon as i touched the anode pin of a power tube (no slip of probe at all), sparks started flying in the PT and the mains fuse blow. DC resistance on both the transformers look ok. What the hell! Can someone explain this to me? What has happened I've really no clue on such a thing
It was the frist thing I checked and no, it was set on voltage. Also my meter is fused for checking current, but i the fuse long ago to avoid stupid mistakes like this. I am still puzzled at this, I now see that the resistance on the HT side of the secondary is super low (8 ohm) and also the bias tap reads about 4 ohm. Those seems a bit off to me, can anyone provide me the DC resistances of the 65 twin reverb PT?
Thanks everybody for the help
- Status
- Not open for further replies.