Hi all,
I was hoping to get some assistance if anyone has some ideas. I am totally stuck trying to figure out what I did wrong or what might be bad on my new Triode ST-70 kit.
I have checked and rechecked every connection. Today I spent 4 hours checking all the resistors on the STS cap board (I removed the board completely from the amp and then desoldered and tested all resistors) and then looking over the circuit again for any possible shorts or other problems. I did find a spot on the choke wire where the sheath had been damaged, I put some heatshrink tubing over it. I thought maybe that was the problem, so I put another fuse in and within 20 seconds the fuse blew. Before I was able to run the amp for a while and the fuse would only blow if I attempted to bias the amp past .9V. Also, when I did a sound check I only got sound from the right channel, and I did swap output tubes and preamp tubes trying to troubleshoot but there was no change, that was before the work I did today.
I checked the resistance of the choke, it is 52ohms. I have also tested both output transformers, and they check out fine, at least by testing resistances according to a guide by Bob Latino.
At this point I think the problem is in the STS cap board, but I dont know for sure, maybe one of the caps is bad? I dont have a capacitance tester, but I could get one if needed.
I am sure there is other info that would be helpful in providing suggestions, but I dont know what is helpful at this point, my knowledge of troubleshooting tube amps is limited. If there is something to check, let me know...I would really appreciate help anyone can provide. I am getting frustrated to no end, I built the amp over a month ago, then didnt get to do much troubleshooting until the last week or two... I did contact Triode via email several days ago and have not heard back, unfortunately their store hours are while I am at work so calling them is not a realistic option unless I skip lunch. I am starting to wish I had not bought this amp, I know thats extreme but the frustration is getting the best of me.
Thanks all,
Greg