Anyone here near NW OHIO ? That can fix my Mark 3 ++ green stripe

  • Thread starter Thread starter Techdeth
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Techdeth

Techdeth

RESIDENT ROCK PROFESSOR
It turns on . . I retubed the preamp tubes and it didn’t fix it
You just get a quiet crackle of noise when you play . Barely audible
Please help
Tech
 
And the power tubes look lit up as normal Nick? Feels more like a power tube issue. This is a good time to ask though we have all the Mark-Talk dudes checking in. :yes:
 
The power tubes look great . Before Mike b put new caps in it a restored it . It kinda sounds like that . My amp tech won’t touch mesa boogie
. I played less than 8 hrs in 2 years
 

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Techdeth said:
The power tubes look great . Before Mike b put new caps in it a restored it . It kinda sounds like that . My amp tech won’t touch mesa boogie
. I played less than 8 hrs in 2 years
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Write to Mesa and make them pay for shipping and fixing it.
 
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Next step (for me anyway) would be to check the Phase Inverter 'preamp' tube. I believe this would be V5 which sits by itself in the middle. I know you said you swapped them all, just double check with a known good 12a preamp tube. Didn't listen to video. Leaving for dinner. Good luck.

Mark guys here will know. :yes:

At least it is not oscillating. :dunno:
 
311splawndude said:
Next step (for me anyway) would be to check the Phase Inverter 'preamp' tube. I believe this would be V5 which sits by itself in the middle. I know you said you swapped them all, just double check with a known good 12a preamp tube. Didn't listen to video. Leaving for dinner. Good luck.

Mark guys here will know. :yes:

At least it is not oscillating. :dunno:
Click to expand...
Mike B s saying the other cap sounds blown
 
I have a quad of something I can send you cracker. If you want to try that. I would probably pull a quad out of something else and try that just for the hell of it.
 
Did you try anything I suggested in your other thread about this?
 
Techdeth said:
Mike B s saying the other cap sounds blown
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Mike B knows these inside out and will turn it around faster than any one of us could.

I would suspect an issue with an LDR. They didn’t use relays back then. If the amp wasn’t completely recapped then that’s what he probably means - one of the low voltage electrolytic caps on the main board that don’t get a lot of attention.
 
This is why I have “tube amp anxiety” constantly.. it dosent matter what company, old or new, serviced or not.. sooner or later there is going to be a time consuming expensive pain in the ass. hope you get it worked out without much hassle
 
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