Awesome!! For some reason I can't post the pix....here is a link to where they are on facebook.
https://www.facebook.com/Goddard.Music/p...
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Oh man!! Yes, ok! I know who this is! Nice to run into you on here Greg. It's Jason/Nirv. Yeah, the amp was a flame/smokeshow. I'd already be on my way...
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Oh man!!! This thread may very well save me. I had my 70's coliseum bass go up in flames at a gig this past Sunday. When I compared the driver PCB 20-0026D...
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Cool, thanks for the comparison numbers. I'm going to have to see what sounds best between the 16W and 20W levels. I don't get how Orange says this amp...
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Yes!!! Finally got it figured out. The scope probe should have tipped me off like you said. When tracing back the line out, I realized that it was in series...
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I seem to have tracked the problem down to the PI circuit. When I send a burst signal into the amp, it goes quiet and the AC signal disappears coming out...Last edited by shiner555; 07-09-2015, 03:03 AM.
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Good suggestion! I'll be back at my bench in a few hours...so I'll report back.
If the heaters are going down for some reason, any ideas on...
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Yep, couldn't sleep last night so I woke up early and spent more time on it today. Basically re-did almost every solder joint on the PCB, and the wires attaching...
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OR120 Pix Only Help!
Hey All,
I recently picked up a 1972 Pix Only OR120. The amp had all of the original lydic's in it and most were blown. I have replaced all...Last edited by shiner555; 07-08-2015, 03:03 AM.
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Hey Guys!
Finally got some time to get back to work on this. I found some bloated lydic's in the PS section, and since I had a bunch on hand...
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Enzo,
Many thanks for the quick reply.
Tubes -> I'm going to test all of them tonight to totally verify, when looking...
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SLM AMPEG SVT-II Pro
Hi Guys,
I just had a friend bring me his SVT-II Pro to take a look at. He's had it at several shops and nobody has ever been able to correct...
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Well.....another interesting night on the bench. Turns out I was chasing a rabbit down a hole with the tremolo. I actually sent a signal the amp tonight...
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Hi Bill,
Yes, great idea. I'm going to try what you suggested as well, that is shorting the power side of the LDR and see if the hum is still...
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I tried two methods of disconnection last night. One, killing the main power feed into the D supply. Hum is gone. I then only disconnected one of the leg's...
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Ok!! Finally made some solid headway. I was able to determine that the issue has nothing to do with V1 or the power supply caps I replaced. The hum and...
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Hi Bill,
I just tried grounding pin 7 and there was no change, except for removal of a loud 60Hz hum from pin 7 being un-grounded. The higher...
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Hi Bill,
Good point! I'll try that tonight and see what I can find out.
Question, based on the fact that the amp is quiet...
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Help with a 68 Sunn Sentura II
Hi Guys,
I'm becoming stumped while trying to repair an old Sunn head. I have an all original 68 Sunn Sentura II I'm looking at
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2000s Standby Switch??
Hi Guys,
I recently just went through and totally re-did over my sunn 2000s, and now for some reason the standby switch is arcing. I by-passed...
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