M
musicman93x
New member
Hey guys I am going to build a Jose modded JMP from a new Marshall 1959HW.
It is my first Jose mod and I am not sure which one Id like to do. The parallel or split cathode style mod.
Ive seen a lot of instructions from Jason Tong from Headfirst amplification and have to say that he is really a top dude for information about these amps.
Current amps that I have and am happy with are a Friedman SS100, BE100, Suhr SL68. What I miss on both Friedmans is the fuzzy smeary top end when driving the master hard like it does on a old school NMV JMP. Hell even a JCM800 does it nice.
Anyway I got all the parts I needed except for the switchable diodes to start. These parts are:
Coax
Shielded Coax
Heat Shrink
500pf, 1000pf, 3300pf ceramic caps
0.68uf polyester or electrolytic caps
2200pf, 4700pf polyester caps
500M Linear Pot / Push Pull with DPDT
1M Audio Taper Pot (depth)
500pf Silver Mica cap
25uf, 250uf electrolytic for fat cap
ECC83/12AX7 Tube Socket
100k, 220k, 330k, 2.7k, 820 resistors
Ill try to maintain a stock looking amp from the front but get some switchable options on the back panel for the depth circuit capacitor, NFB, and V1a/b resistor and cap values and Fat cap.
It will get the pre tone stack master. The depth circuit will utilize a 6way double pole rotary switch on the back using .0022uf to .0068uf caps each in polyester and ceramic to try different dielectrics. I heard ceramic in the depth curcuit is the way to go.
If anyone has some tips to try out I would be very happy to incorporate. Its not my first mod..I am handy with a soldering iron and know the risks and how to drain the caps before operating inside.
If someone is interested in doing it as well I am happy to share some details and post pics here.
I am located in South Germany if anyone is really serious about it.
It is my first Jose mod and I am not sure which one Id like to do. The parallel or split cathode style mod.
Ive seen a lot of instructions from Jason Tong from Headfirst amplification and have to say that he is really a top dude for information about these amps.
Current amps that I have and am happy with are a Friedman SS100, BE100, Suhr SL68. What I miss on both Friedmans is the fuzzy smeary top end when driving the master hard like it does on a old school NMV JMP. Hell even a JCM800 does it nice.
Anyway I got all the parts I needed except for the switchable diodes to start. These parts are:
Coax
Shielded Coax
Heat Shrink
500pf, 1000pf, 3300pf ceramic caps
0.68uf polyester or electrolytic caps
2200pf, 4700pf polyester caps
500M Linear Pot / Push Pull with DPDT
1M Audio Taper Pot (depth)
500pf Silver Mica cap
25uf, 250uf electrolytic for fat cap
ECC83/12AX7 Tube Socket
100k, 220k, 330k, 2.7k, 820 resistors
Ill try to maintain a stock looking amp from the front but get some switchable options on the back panel for the depth circuit capacitor, NFB, and V1a/b resistor and cap values and Fat cap.
It will get the pre tone stack master. The depth circuit will utilize a 6way double pole rotary switch on the back using .0022uf to .0068uf caps each in polyester and ceramic to try different dielectrics. I heard ceramic in the depth curcuit is the way to go.
If anyone has some tips to try out I would be very happy to incorporate. Its not my first mod..I am handy with a soldering iron and know the risks and how to drain the caps before operating inside.
If someone is interested in doing it as well I am happy to share some details and post pics here.
I am located in South Germany if anyone is really serious about it.
