Search results

Schematics for Mark V 35 footswitch and FS Matrix here: https://boogieforum.com/threads/mesa-boogie-mark-v-35-footswitch-schematic-pinout.87864/

Today I asked Mesa Boogie for the pinout on the Mark V 35 Footswitch (5-pin Din jack) and they sent the whole footswitch schematic over immediately. What a great company :love: I figured I'd add it here for future reference. I just successfully built a 5-pin Din Male to 2x TS(Female) project...

I have an odd sound coming from my MK1 (see short video clip). I've tracked the issue down to the Reverb Tube (I'm 99% that is the reverb tube - see blue arrow). It's a high-pitched laser-beam harmonic distortion that sits above an otherwise clean tone. It is most prominent when playing lower...

Fred, do you know what that single RCA jack is for (above your amp's date)? My Mk1 head has a 1/4" jack there (the two chassis holes to each side are populated with RCA's for my reverb tank). Is it a Power Amp input maybe?

Thanks to some detailed photos of other user's Mark 1's on this board, I figured out the Footswitch Boost mod just by looking at it. It's about as simple as I had hoped. At the back of the first Push-Pull Potentiometer (Gain Knob #1/Boost) there is a resistor strapped across the two pins. If you...

I understand that a Footswitch (to boost channel 1) was a factory option on the Mark 1’s. I would like to add this to my Mark 1 head. Does anyone have experience/instructions on how exactly to implement this mod? I have to imagine it’s pretty straight forward and there’s already a blank hole in...

No speaker, it's the head version. Not sure about the Fetron, I'll have to take a look but I think it's all newer tubes. The tech who sold it to me did a re-cap. So far it's a great sounding amp. The GEQ definitely gives it a lot of tone options.

I recently bought an original Mark1 60w head, sn204x, w/reverb, loop, geq. It is dated June78. Interesting that the OP's mk1 is only 3 months older and didn't get the GEQ. Was the graphic eq an available add-on with many markI's? Or is it because the Mkii's were brewing in late 78? Can I ask a...