JTM 100 Mk V
New Member
- Joined
- Mar 7, 2020
- Messages
- 15
- Reaction score
- 21
Greetings From Toneville everybody ,
Well my beloved 68 SuperBass developed some noise and an overtone that was ugly, so I shut it down and put it on the bench. I immediately noticed a bulge in the PI cap. I've been pushing my luck on the caps I know, but the tone has been to die for while in my care and I've kept a close eye on things. So I had an F & T 32/32 on hand and performed the swap.
This amp sounded remarkable, VHII and WACF tones all day long into the matching cabs with 25's. The remarkable tone factor here was the spongey bouncy bottom end. Tight, not stiff. Very elastic yet dynamic.
With this F & T, the mojo just went out the window. I've got more volume and high end with stiffness. Noticably stiffer.
I get the fresh cap sound, I've recapped and built stuff where I've heard it age and break in over time.
Thats now what I'm hearing. Radical tone variation.
So, first reaction is . . . Where can I source NOS Marcon 40 / 40 Filters ?
From there I am all ears, I've never had this radical a change from one filter or part thats within spec.
I don't believe the F & T is bad, in fact quite the opposite, Its very healty. I don't think a 50 / 50 LCR would be the answer either. So it leads me to ask about the Marcon here. Was it "THAT" good ? Was I only operating on half of the cap to begin with ? I only measured the UF when it was out and drained, and it speced ok ... 41 / 42 actually.
I'm a little confused and could use some advice here.
Thanks alot in advance and I look forward to getting the groove back. I'll include pics :
Well my beloved 68 SuperBass developed some noise and an overtone that was ugly, so I shut it down and put it on the bench. I immediately noticed a bulge in the PI cap. I've been pushing my luck on the caps I know, but the tone has been to die for while in my care and I've kept a close eye on things. So I had an F & T 32/32 on hand and performed the swap.
This amp sounded remarkable, VHII and WACF tones all day long into the matching cabs with 25's. The remarkable tone factor here was the spongey bouncy bottom end. Tight, not stiff. Very elastic yet dynamic.
With this F & T, the mojo just went out the window. I've got more volume and high end with stiffness. Noticably stiffer.
I get the fresh cap sound, I've recapped and built stuff where I've heard it age and break in over time.
Thats now what I'm hearing. Radical tone variation.
So, first reaction is . . . Where can I source NOS Marcon 40 / 40 Filters ?
From there I am all ears, I've never had this radical a change from one filter or part thats within spec.
I don't believe the F & T is bad, in fact quite the opposite, Its very healty. I don't think a 50 / 50 LCR would be the answer either. So it leads me to ask about the Marcon here. Was it "THAT" good ? Was I only operating on half of the cap to begin with ? I only measured the UF when it was out and drained, and it speced ok ... 41 / 42 actually.
I'm a little confused and could use some advice here.
Thanks alot in advance and I look forward to getting the groove back. I'll include pics :