Do they hurt?tone? said:
tone4days said:
XSSIVE said:
Jeff Seal said:Well, let's see...... first off Luke's amp arrived in pristine condition internally, and after watching one of the 12ax7's disintegrate in the tube tester, it was determined that was probably the cause of the massive "hum". Put in an old RCA and fired her up......awesome doesn't begin to describe the 2204 tone! So any changes would be better suited on a new platform and the entire original PCB came out (pots, jacks and all), thus insuring both the original circuit remained intact, while still achieving the desired results. (not like these amps are going down in value anytime soon) I get many old Marshall's in and most have been "altered" beyond recognition...which happens to be a "pet peeve" of mine.
Between all the amps I get in to be "modded, unmodded and re-modded" I have a rather nice collection of turret boards and used PCB's lying around, but not a single one as nice as Luke's.... So I grabbed a turret board and went to work!
Luke was after what quite a few people are after, not tons of gain like a Mesa, but more of a "Marshall on steroids" type tone. SO..... the circuit you see is a combination of a 1959(super lead) 2204, 2210 and a 2555. The basic premise was to create a 2204 with a PPIMV but without the "drawbacks" the new MV create's. (that is a discussion within itself!) The layout is gain, gain, gain, tone stack(plate driven) MV then another gain stage.
Besides being incredibly loud, the amp now has twice as much gain, but with the ability to clean up nicely at all levels. Single handedly the coolest thing is that little trimpot located to the bottom about halfway through the board. It allows the rate of which OD is achieved to accomodate playing styles by either increasing or decreasing the onset of OD while simultaneously "boosting" the level proportionately. Basically all the way down is standard 2204 gain structure, up is closer to TSL. This allows the use of the guitar's volume control to further dictate the amp's OD amount. (if that made any sense at all!)
..it's just a bad*ss Marshall!
Jeff Seal
Jeff Seal said:Well, let's see...... first off Luke's amp arrived in pristine condition internally, and after watching one of the 12ax7's disintegrate in the tube tester, it was determined that was probably the cause of the massive "hum". Put in an old RCA and fired her up......awesome doesn't begin to describe the 2204 tone! So any changes would be better suited on a new platform and the entire original PCB came out (pots, jacks and all), thus insuring both the original circuit remained intact, while still achieving the desired results. (not like these amps are going down in value anytime soon) I get many old Marshall's in and most have been "altered" beyond recognition...which happens to be a "pet peeve" of mine.
Between all the amps I get in to be "modded, unmodded and re-modded" I have a rather nice collection of turret boards and used PCB's lying around, but not a single one as nice as Luke's.... So I grabbed a turret board and went to work!
Luke was after what quite a few people are after, not tons of gain like a Mesa, but more of a "Marshall on steroids" type tone. SO..... the circuit you see is a combination of a 1959(super lead) 2204, 2210 and a 2555. The basic premise was to create a 2204 with a PPIMV but without the "drawbacks" the new MV create's. (that is a discussion within itself!) The layout is gain, gain, gain, tone stack(plate driven) MV then another gain stage.
Besides being incredibly loud, the amp now has twice as much gain, but with the ability to clean up nicely at all levels. Single handedly the coolest thing is that little trimpot located to the bottom about halfway through the board. It allows the rate of which OD is achieved to accomodate playing styles by either increasing or decreasing the onset of OD while simultaneously "boosting" the level proportionately. Basically all the way down is standard 2204 gain structure, up is closer to TSL. This allows the use of the guitar's volume control to further dictate the amp's OD amount. (if that made any sense at all!)
..it's just a bad*ss Marshall!
Jeff Seal
