Can you read schematics?If not Ill try to walk you through, or others may be able to help, hopefully not confuse you
If we can get some up close pics it will help too. The cap will look like a tiny can either silver, black, or yellow, sometimes off white from age. In the pic it is a black cap.That resistor is for the Pull Gain boost. The newer Marks on one channel now have a Middle control that from 0-12 O'clock its a regular Middle control, 12 noon to 5pm is boost. So on the early Marks even some Mark I's, there is the 100k resistor, see the Middle control on the Mark was 10k pot as in most Fender amps, when you have 100k there, it pushes the gain up past the range of the tone stack/EQ bypassing the EQ, giving you all that Boost like on Santana's "Europa" in fact his Snake skin Mark I didn't even have cascaded gain in the 1st Mark I, it had the Gain boost or Tone Stack bypass switch. Some have the added cap to reduce the high frequencies, so the boost is not so fizzy, you can add it if you want to, the earlier ones did not have it yet. I hope that helps
Yes, some came stock, they later added the cap to reduce fizziness, you can attach a ceramic cap across the resistor if you want to reduce some fizziness, different values like .001uf, .002 or even .0047, the bigger the cap, the more treble roll off as you know, the cap goes from the signal to ground through the switch on the schematic
It depends on the amp, speaker, guitar and your ears Great pics Jamme 1961!!!
If you know about the polarity great, if not, be sure that the "+" end of the cap is in the direction of pin 8 (cathode) of V3B 12ax7.
They are great, UNDERATED amps that just need love and attention and they will take care of you! They are also easier to work on than the newer Mesa's and sound sweeter in many cases especially with the right parts!
Let us know how it works out for youThey are great, UNDERATED amps that just need love and attention and they will take care of you! They are also easier to work on than the newer Mesa's and sound sweeter in many cases especially with the right parts!
I thought I pointed that out but maybe it was in another thread. I even posted pics with the info, did you see them?
