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Maybe somebody here has had this issue........when the amp is sitting with all the controls turned down, then crank the reverb up to about 7 or higher, it starts to feed back.......I had also noticed some crackling noises as well...removed the chassis and cleaned the pre-amp sockets with De-oxit....removed the reverb tank and hooked everything back up on my bench.....using a completely different speaker and the amp was dead quiet and no feedback with the reverb.....put everything back in the cabinet again and same issue with the reverb....I also tried to turn the tank 180 degrees and just lay it at the bottom of the cabinet...same thing.....I have to take the tank out of the amp completely in order for the reverb to work properly......any suggestions???
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Tried different tubes? I know it doesn't make sense, but there's a lot of acoustic stuff and other "voodoo" that we just don't understand that can go on... sometimes one part just doesn't like to work with another...
Justin"Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
"Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
"All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister - -
Are they the stock speakers in there? And the bag, cardboard, etc. is all normal?
Does anybody ever turn the reverb that high?
Originally posted by Enzo
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I would 'reglue' the reverb coils.
Run a small dab down the sides of the inductor coils.Comment
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I switched the tubes around being careful to remember which one goes where originally......no difference....I'll try a few different types of tubes tomorrow and let you know...Originally posted by Justin Thomas View PostComment
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The speakers are stock and the bag and cardboard are all fine....This is a brand new amp actually......and the customer is about 6 hrs away and only had the amp one day.....I have a 68 Custom Twin Reverb that is so noisy that you can't even use it and that one is brand new as well...I am going to take the tank out of that one and try it to see if that helps......Actually the owner was getting it to feed back at around 4 when playing a guitar.....and it will feedback at 6 with no guitar....so something is not right.......I am going to try another tank first and I'll let you know......Originally posted by g1 View PostAre they the stock speakers in there? And the bag, cardboard, etc. is all normal?
Does anybody ever turn the reverb that high?
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Ok Jazz...if it turns out to be the tank I'll try that....Originally posted by Jazz P Bass View Post
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I just had a similar problem with a '66 Twin. The tank was so sensitive the customer couldn't gig with it. If anything touched the amp it would go into this spongy springy oscillation. One of the springs was pretty slack and just flopping around. I cut some of it off and made it more taut, but it didn't fix it to anyone's satisfaction. I ended up replacing the tank, problem solved.It's weird, because it WAS working fine.....Comment
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Yeah..I am going to try another tank from a 68 Custom Twin tomorrow....just to see if that is the problem....if it is the tank , I'll try the tip from Jazz...Thank you for the reply.....Once I get this sorted out I still have that 68 Custom Twin here that also has a weird problem....but that one is for a different thread.....Originally posted by Randall View PostComment
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FWIW: I've used a small bit of glue on the inner part of the transducers as Jazz suggested with good results.Last edited by The Dude; 04-18-2018, 12:52 AM."I took a photo of my ohm meter... It didn't help." Enzo 8/20/22Comment
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Ok. Just checked it out...I took the tank and cables out of the 68 Custom Twin and installed it into the 65 Twin....no feedback....I will try the glue trick to see if that works.....if not then the tank will have to be replaced....Originally posted by The Dude View Post
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In other words, you're potting them? With Elmer's?Originally posted by The Dude View Post"Stand back, I'm holding a calculator." - chinrest
"I happen to have an original 1955 Stratocaster! The neck and body have been replaced with top quality Warmoth parts, I upgraded the hardware and put in custom, hand wound pickups. It's fabulous. There's nothing like that vintage tone or owning an original." - Chuck HComment
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Not the transducer itself.
I reglue the bracket where it fits over the steel laminates. (as it is from the factory)Comment
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What happens if you set the tank on a piece of foam? If it is mounted on hard rubber grommets it will do exactly what you are describing.Comment
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I never tried that actually......come to think of it......It would be interesting just to see.......Originally posted by olddawg View PostComment
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