So the story goes...
- Back in 2002 I purchased a bone-stock, used Marshall JTM45RI for about $600.00
- It sounded like ass and was nothing like a mid 60's JTM45
- In 2004 I installed a PTP kit and lots of fixin's (MM OT, NOS Mullard pre's, VA KT66 power, etc)
- It sounded great!
Fast forward to 2013...
- I wanted MOAR GAIN and the ability to use 6CA7s & variac down, so I modded it again
- swapped grid resistors from 470 to 1K
- swapped 27K NFB resistor to 47K
- moved NFB wire from 16ohm tap to 8ohm tap
- changed tonestack to Superlead values
- tried a trebley-er bright cap but yuck... took it off (500pf stayed)
- got a pair of EHX 6CA7s... very nice - clank and crunch
- it sounded closer to what I wanted...
Here's what it sounded like (and currently sounds like):
So fast forward to 2017...
It's time to finish the job. The amp is still extremely thick and needs to have some more parts changed
to get things exact. I also gotta figure out something to go from shared cathode to split (turret board
is designed for shared only).
I've gone through the amp and labeled everything (huge size, so had to shrink it; probably unreadable).
My ever-faithful assistant is ready to lend a hand...
- Back in 2002 I purchased a bone-stock, used Marshall JTM45RI for about $600.00
- It sounded like ass and was nothing like a mid 60's JTM45
- In 2004 I installed a PTP kit and lots of fixin's (MM OT, NOS Mullard pre's, VA KT66 power, etc)
- It sounded great!
Fast forward to 2013...
- I wanted MOAR GAIN and the ability to use 6CA7s & variac down, so I modded it again
- swapped grid resistors from 470 to 1K
- swapped 27K NFB resistor to 47K
- moved NFB wire from 16ohm tap to 8ohm tap
- changed tonestack to Superlead values
- tried a trebley-er bright cap but yuck... took it off (500pf stayed)
- got a pair of EHX 6CA7s... very nice - clank and crunch
- it sounded closer to what I wanted...
Here's what it sounded like (and currently sounds like):
So fast forward to 2017...
It's time to finish the job. The amp is still extremely thick and needs to have some more parts changed
to get things exact. I also gotta figure out something to go from shared cathode to split (turret board
is designed for shared only).
I've gone through the amp and labeled everything (huge size, so had to shrink it; probably unreadable).
My ever-faithful assistant is ready to lend a hand...
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