Markedman
Well-known member
Could somebody tell me what going on in here? Looks like a mess to me, I really don't like the Japanese parts. https://www.flickr.com/photos/100168049@N04/15067555797/
Mark llA gut shot - help!
- Thread starter Markedman
- Start date
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Boogiebabies
Well-known member
The main caps look like mid 90's Mesa United Chemi-Con caps. The one on the preamp rail is just an oddball. It should be the same
size as the 30UF/ 500V in the power supply.
size as the 30UF/ 500V in the power supply.
Markedman
Well-known member
Does it look heavily modified?
Boogiebabies
Well-known member
Markedman said:
No, looks like it had some repair work but some old Mesa's are just sloppy.
Markedman
Well-known member
Thanks, it has a Mark llC front plate. I thought maybe it was modded.
Boogiebabies
Well-known member
Definately not a IIC preamp board. Maybe a IIB ?
McBarry
Well-known member
I can help here..
The preamp board is an RP-6A - the two zeners visible under that ginormous grey cap are a giveaway..
Being the 6A board, this places it square in the Mk IIA territory.
Both of my MK IIB's have the RP-9A board, where the zeners have been replaced with a solid ground track.
This is also reflected in the actual schematics that I was lucky enough to get with each amp from the original seller.
The preamp board is an RP-6A - the two zeners visible under that ginormous grey cap are a giveaway..
Being the 6A board, this places it square in the Mk IIA territory.
Both of my MK IIB's have the RP-9A board, where the zeners have been replaced with a solid ground track.
This is also reflected in the actual schematics that I was lucky enough to get with each amp from the original seller.
Markedman
Well-known member
Thanks, you guys have been a big help.
