please help !! rev C schematics for part replacement

[danvortex]

anyone has rev C schematics ?? I own dr#29 and it needs a red channel's gain pot replacement, i need to know what is in there exactly to preserve the tone.
I'd also like to find the schematics for this revision for futur use. I also own a REV D, so if anyone got that one too...

thank you for your help

Dany

 

[fluff191]

I don't think they kept the early revision schematics.

And is the pot beyond pulling the chassis and measuring it?

 

[danvortex]

the tech who,s working on it asked me to fond the specs, i don't know if he has a problem measuring it. Someone from Mesa answered giving me the 2 channels pot specs but he did not tell me if the pot is the same for all the 2 channels revisions

 

[mikey383]

All I have are Rev. F schematics, but I'm showing a 1Meg pot.

 

[danvortex]

Hey there Dany,

The Red Channel gain pot on a 2-Channel Dual Rectifier utilizes a 250K 5% Audio Taper pot. Hope that helps.

Best Regards,


This is the answer i got from Marcus Daniel

 

[mikey383]

The treble pots are 250K, but both sets of schematics I have show a 1 Meg pot for both the orange and the red channel gain.

The Tremoverb schematics I have also show a 1Meg pot for the gain on both channels, 250K for the treble.

My manuals show part number 592794 on both channels, for both the Dual/Triples and the TOV.

Maybe your tech could pull the orange channel's gain pot and measure it. :?:

 

[mikey383]

Although GNZ's TOV has 250K gain pots in his... :?: :?: :?:

So, I open my tremoverb to change the pot value and finaly do a comparision and clips, but ironicaly, my 2 channel dual rectifier tremoverb has 250K pots!!!!



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waht this mean??? every recto has 250k??? or just the new ones??? do the 2channel rectos pre 500 has 1M pot???
there is my recto serie



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well, it`s the perfect situation for me to tell you if change 250k to 1M make a diference, or not, and how, so i did:



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And my veredict is...

1M pot dont change the tone like you are moving any well of the eq, it changes the feel and tone from the gain, make it a litle more fat, chunkier and adding a more crunch to the mid range, it make a more tight low end too. it is not a night and day change, its like your rectifier just awake more angrier, and horny... :evil:
i like a lot the change, thats way i put new pots and new and better caps as you can see in the picture, and i will make some clips, but to make 1M to 250K i just will run a 330k resistance in paralell to the pot.

regards!

 

[jamme61]

I have schematics from a pdf file called mesa support V1.2. it shows the gain pots on my TOV to be 250K (mesa part # 592794) not 1 meg. The weird thing is, on my shematics for the dual rec, it shows a 1 meg gain pot but, the mesa part listed in the same schematic is 592794, which is a 250K gain pot. When I took my TOV apart and looked at the gain pots, both were 592794 and measured 250K. You can call mesa and they will tell you and sell you the pot too. Hope this helps

2 CHANNEL DUAL / TRIPLE RECTIFIER SOLO HEAD

Gain Pot 592794 Gain Pot 592794

Treble Pot 592738 Treble Pot 592738
Middle Pot 593737 Middle Pot 593737
Bass Pot 593739 Bass Pot 593739
Presence Pot 592151 Presence Pot 593737
Master Pot 592739 Master Pot 592792

 

[danvortex]

Thank you all guys!!

Marcus at Mesa answered my second mail yesterday, he says the red channel's pot on 2 channels DRs are 250K (all revisions)