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In Reply to: RE: Music Reference RM9mkII Driver Tubes posted by Blackdog on August 21, 2020 at 14:51:06
Dan,
Thanks for getting back. Wasn't clear in my note. I did reinstall the original driver tubes from Ram Labs and flipped them to see if that would make a difference. Nada. You get tired of fooling with the trim pots after a while. Something happened to upset the amp by inserting those NOS tubes--but what?
Follow Ups:
If comfortable doing so, just use a soldering iron to reflow the existing socket pins where they contact the pcb board. Just smear a titch of flux using a toothpick on each contact should give you good results. Don't add more solder unless you really need to. Remove flux with flux remover if you have any on hand. Not too critical if you use it sparingly.
Doing a solder reflow should fix any broken connections.
Soldering done with amp off if course.
Clean and tighten the tube socket insert contacts too if you can.
Barring all the work above, you could always try wiggling the tubes in their sockets to see if the sound sputters back. But if it does, you'll end up doing the repair anyways. And sometimes wiggling isn't the best thing unless you've felt with situations like this before.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
As mentioned above, those boards are a bit flimsy. Probably a broken board trace or two.
Dan Santoni
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