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Post by ss "Shane" on Feb 23, 2016 23:08:09 GMT -7
Not sure if anybody else has experienced this with their Therapy so I thought I'd ask...today I powered up my Therapy and had almost no volume. Nothing else happened other than that. No strange noises and no popping, just volume loss. I cranked my master up to 3 o'clock and volume up to noon and the volume was equal to about 7 o'clock and 7 o'clock if that.
I pulled each tube out, reseated them and gave it another try. What ever I did by doing that fixed my problem. So if my problem is a tube about to be playing out which tube would be the most likely culprit? I mean, I really don't want to buy all new replacement tubes right now if I don't have to. Also, could this be a symptom of a bigger problem other than tubes and lastly, what is the explanation of me reseating tubes being a fix to what was going on?
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Post by BritInvasion on Feb 24, 2016 5:03:18 GMT -7
Just making a guess here but I would suspect the rectifier tube. If it's on the verge of dying it might not have been supplying enough voltage. Reseating it may have temporarily shaken something inside the tube back into place.
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Post by ss "Shane" on Feb 24, 2016 7:55:57 GMT -7
Thanks for the input, I guess I should have posted this in the tube section of this forum, but since I'm here are there any suggestions on THERAPY specific rectifier tubes that are long lasting and won't give me too much sag? I need quality at a good price because I've been spending way too much on other gear here lately.
Oh, I forgot to mention that when it pulled the rectifier tube (V5) I shook it a little and heard what sounded like something shaking around inside of it. I'm far from an amp tech so I'm calling V5 the rectifier tube.
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Post by purpletele on Feb 24, 2016 10:00:53 GMT -7
Shane,
I just bought a couple of Rectifiers from Mike at KCANOS.
I bought a JJ rectifier for back up at $20 and I bought a NOS Jan/Phillips (Mislabled) for $100.
He can provide you the list of NOS rectifiers that he has in stock.
That's my 2 cents.
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Post by BritInvasion on Feb 24, 2016 11:08:37 GMT -7
Also the Sovtek have been pretty good lately FWIW.
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Post by benttop (Steve) on Feb 24, 2016 12:00:22 GMT -7
Did you do any troubleshooting? For example, what was connected between your guitar and the amp? Any pedals? Did you try without them? Try a different guitar cable? What possibilities have you already eliminated?
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Post by ss "Shane" on Feb 24, 2016 12:19:55 GMT -7
I haven't ruled out one of my cables. Here is exactly what I did:
- Pulled each tube and put each tube back in - plugged up as I always do, guitar pedal board, amp - problem was still there - tried another cable (from guitar to board) - problem seemed to be 100% fixed - then I used the original, possibly bad cable - problem STILL fixed with that cable
So with that said, I'm still using the cable I started out with in hopes that if it happens again I can focus on switching cables again for a better diagnosis.
Pedalboard consists of (in order) an SP compressor, Paisley Drive, Blues Driver and an MXR Carbon copy. Everything is on a Nano board powered by a Cioks Adam.
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Post by benttop (Steve) on Feb 25, 2016 8:02:45 GMT -7
Troubleshooting is a process of elimination. It makes it harder when the problem is intermittent, but you MUST fully explore anything that you cannot explain, until you CAN explain it.
In the case of your guitar cord, maybe it was dirty, or not fully seated. You can't really go back and verify the dirty theory, but you might be able to repeat the not fully seated theory.
What you probably HAVE learned is that the amp is fine, and it's likely something to do with your cables or pedal board. That would be good news from the perspective of the amp, but still problematic until you're certain you've isolated the defect and corrected it. Good luck!
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