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Only outstanding issue was that miswired ot. My bench test speaker rig is a 412 cab loaded with gk12-100’s haha....
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Thanks guys ^. Done and done. She sounds beautiful....
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Apologies. Lots of fam action. Plates are at 400v. No audible oscillation. Amp arrived with the ot primaries reversed and correcting it resolved the low level...Last edited by fdesalvo; 06-21-2023, 04:09 AM.
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I should have been more clear in that the chart isnt this specific amp, but a similar clone using he same iron. When I received the amp, it wasn't working....
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JTM45 Clone - distorting heavily
Hello, all!
I'm troubleshooting a JTM45 clone that's distorting heavily with the volume from 2-onward. The distortion sounds like a biasing issue,...Last edited by fdesalvo; 06-20-2023, 09:33 PM.
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Preach. I made the same mistake myself. Customer decided to keep the stock jacks.
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Hot Rod Deluxe - FX loop jack upgrade?
Hi, all.
Have any of you used switchcraft type jacks to replace the plastic fx loop jacks on these amps? Wrapping up a repair and the owner...
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A humbling oversight on my part. But it came in handy, as lightning struck twice. I was given a load of prototype and classic fender amps to restore from...
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I forgot to close this out. Apologies. Found 1k resistors making up the heater’s artificial ct!
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Wanted to close the loop. Found this little .51” diameter gem.$11-14. Thanks again for the great leads ...
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I followed up the the mains ground too.
I have LED and incandescent lights at the bench. It makes the same
noise in other rooms of the...
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All grounds intact. All pot and jack mating surfaces are clean. Only speaker cable plugged in.
Sound file attached. Ty!...
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Only grounded it for a quick moment. Not sure that was even a relevant test. I’m getting .4 ohms measuring jack to chassis. I get .2 ohms when I short...
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I wish it were the case. I’ve had my phone on airplane mode with Wi-Fi off and even powered down all together. That digital noise is just part of the...
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Apologies - haven't been getting notifications, so pardon the hanging replies.
Tacking in new OT doesn't resolve anything. Was...
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Excellent thank you all! I just took in the amp bad was able to remove the back enough to get some good cleaner in. Really appreciate the help....
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Thanks for the leads! These sit on a brown note dumble clone. The shaft is thin and about an 3/4” long. These are 250k used for fx send and return...
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Help ID this pot
Here’s a long shot, but have any of you seen a pot that looks like this? It’s in a dumble clone from an infamous and defunct builder of
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Thanks, guys.
PI wiring is per schematic/layout. With ot wired per layout, equaling stops with feedback resistor lifted. Buzz I’m complaining...
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Tomorrow I’ll sub in a know. Good OT, but something strange I’ve noticed. Amp has original OT. When it was running KT88’s, the blue and...
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