TMB tremolo part deux
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Re: TMB tremolo part deux
Josh.. I was experimenting with the amp with 12at7 and 5751 in V2. The OD on low volume disappears. I'm still deciding if I like it better.. it looses its Mojo a bit. The at7 is some Chinese tube that I have for a very long time..unused. and the 5751 is an old JAN. It feels as if the ideal tube is somewhere between those two and the JJ12ax7S that 's been in there all the time. Do you have a suggestion what types and brands I should definitly try?
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Re: TMB tremolo part deux
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Re: TMB tremolo part deux
That's with the 2.2K resistor on V2 cathode 1? Post the demo publicly, it sounds awesome. I think I'll update the schematic with that value, and leave a note if people want more gain to lower that a little.
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Re: TMB tremolo part deux
Yes that is a 2k2 cathode resistor on the first triode of V2. It magically added even more touch sensitivity that while clean sounds are obtained with lighter touching the strings, there is some decent gain on tap when strummed harder. You know I have the part of voltage devider that goes to ground with a 500k audio pot and 10k resistor in series. The pot was set at vol 4 for the recording. Didn't measure the resistance...JMPGuitars wrote: ↑Sat 05/30/20 7:58 amThat's with the 2.2K resistor on V2 cathode 1? Post the demo publicly, it sounds awesome. I think I'll update the schematic with that value, and leave a note if people want more gain to lower that a little.
https://www.dropbox.com/s/k4rlwdg0c64a9 ... 2.m4a?dl=0
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Re: TMB tremolo part deux
Hey I have an idea...
What if I wire a parallel resistor on the 2.2k CR V2 cath 1 that can be brought in by footswitch... that would give me an OD pedal.. if I wire a 5k pot + switch in a pedal to do so then I would be able to dial in the amount of OD...
Is this a good idea, that being the cathode and all...?
Maybe try a 3k resistor first, that would bring me in the ballpark of 1.5k , just like it initially was with the OD on the preamp. I have a dual footswitch that on 1 side controlls the tremolo, the other side might be used for engaging the OD via the 3k resistor. It means it would share ground with the tremolo switch, but we'll see if that's a problem when doing the alligator clip tryout. The input jack for the footswitch is a stereo jack already, so... quick testing is easy enough
What if I wire a parallel resistor on the 2.2k CR V2 cath 1 that can be brought in by footswitch... that would give me an OD pedal.. if I wire a 5k pot + switch in a pedal to do so then I would be able to dial in the amount of OD...
Is this a good idea, that being the cathode and all...?
Maybe try a 3k resistor first, that would bring me in the ballpark of 1.5k , just like it initially was with the OD on the preamp. I have a dual footswitch that on 1 side controlls the tremolo, the other side might be used for engaging the OD via the 3k resistor. It means it would share ground with the tremolo switch, but we'll see if that's a problem when doing the alligator clip tryout. The input jack for the footswitch is a stereo jack already, so... quick testing is easy enough
Last edited by Bieworm on Tue 06/02/20 5:06 am, edited 2 times in total.
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Re: TMB tremolo part deux
If you put low gain tubes in the V2 position, it's no longer a Marshall 18W, but some other amp, as that change totally changes the preamp gain structure. Definitely try a re-issue Mullard ECC83 (made by New Sensor) for some really beautiful tone.
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Re: TMB tremolo part deux
Noted!!!zaphod_phil wrote: ↑Mon 06/01/20 7:04 pmIf you put low gain tubes in the V2 position, it's no longer a Marshall 18W, but some other amp, as that change totally changes the preamp gain structure. Definitely try a re-issue Mullard ECC83 (made by New Sensor) for some really beautiful tone.
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Re: TMB tremolo part deux
Did you see my post about the lamington reverb? I would appreciate your opinion about it...and I'm somewhat confused about the power trannie. How do you see that?JMPGuitars wrote: ↑Wed 04/22/20 5:16 pmHa, both sound great. I admit I didn't listen all the way through on either, but I didn't find it that noticeable before, and not at all after. Did you still hear it somewhere?Bieworm wrote: ↑Wed 04/22/20 1:47 pmNew voltage chart..after the PR mod. 15V zeners + UF diodes
The fizz is 99% gone. Did recording before and after. Full blast ...
Before PR mod:
https://www.dropbox.com/s/sh56wppb87ti6 ... 3.m4a?dl=0
After PR mod:
https://www.dropbox.com/s/sh56wppb87ti6 ... 3.m4a?dl=0
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Re: TMB tremolo part deux
i found out that in an other amp I had some very nice tubes hiding inside that I forgot about...
1 gold pin EHX 12AX7EH
1 tung sol 12AX7
So after some playing around I found the EHX in V1 and the TS in V2 were absolutely amazing AND much less hiss..
So I put the JJ's in the box
The EHX and TS are a very big improvement!!! Though the JJ's were nice too..
Had a 12AT7 groove tubes in the other amp too, but in V1 it sounded really great, but the tremolo started thumping.. no go!!
1 gold pin EHX 12AX7EH
1 tung sol 12AX7
So after some playing around I found the EHX in V1 and the TS in V2 were absolutely amazing AND much less hiss..
So I put the JJ's in the box
The EHX and TS are a very big improvement!!! Though the JJ's were nice too..
Had a 12AT7 groove tubes in the other amp too, but in V1 it sounded really great, but the tremolo started thumping.. no go!!
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Re: TMB tremolo part deux
Did you build the cabinet?
The one I did last year is similar for that 18W build:
viewtopic.php?f=4&t=25367
I just don't like the controls at the top back, inconvenient. Then again, the thing I HATE about my Fender Twin Reverb is the switches in the back. But, they had to put the logo somewhere, I guess...
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Re: TMB tremolo part deux
roadshow wrote: ↑Tue 06/09/20 4:10 pmDid you build the cabinet?
The one I did last year is similar for that 18W build:
viewtopic.php?f=4&t=25367
I just don't like the controls at the top back, inconvenient. Then again, the thing I HATE about my Fender Twin Reverb is the switches in the back. But, they had to put the logo somewhere, I guess...
Yep I built them both from scratch. The cut-outs even done by hand. My TMB tremolo has the standard top control and my classic is front controlled.
You're right about switches on fenders. The thing that bothers me most is that they don't have a standard spot for those switches. It depends on the type...
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Re: TMB tremolo part deux
Nice work,
Along with the 18W BB I copied the link in my last reply, here's the Marshall 4x12 slant I built:
viewtopic.php?f=7&t=25652
Along with the 18W BB I copied the link in my last reply, here's the Marshall 4x12 slant I built:
viewtopic.php?f=7&t=25652
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Re: TMB tremolo part deux
Nice man!!!roadshow wrote: ↑Tue 06/09/20 10:04 pmNice work,
Along with the 18W BB I copied the link in my last reply, here's the Marshall 4x12 slant I built:
viewtopic.php?f=7&t=25652
The hardest part is getting a straight and tight grill cloth... oh man that's a sweat job!!!
The coolest combo I made was building a 3x10 combo for my vibrolux reverb.
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Re: TMB tremolo part deux
for the record.. after 2 band practices I decided I wanted a little more preamp dirt. I changed the 2.2K resistor over the .68uf cap to 1.88k (1.5K + 470R in series) I will have the next practice next thursday.. will report back after that. Eventually I will put a 1.5K with a 680R in series with a switch to lift/bypass the 680R.
Edit: heck!!! Did it just now anyway!!! It's promising
Edit: heck!!! Did it just now anyway!!! It's promising
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Re: TMB tremolo part deux
I'm reading through the thread and listening to your clips. Are you aware the two links above are the same?Bieworm wrote: ↑Wed 04/22/20 1:47 pmNew voltage chart..after the PR mod. 15V zeners + UF diodes
The fizz is 99% gone. Did recording before and after. Full blast ...
Before PR mod:
https://www.dropbox.com/s/sh56wppb87ti6 ... 3.m4a?dl=0
After PR mod:
https://www.dropbox.com/s/sh56wppb87ti6 ... 3.m4a?dl=0
Nice playing and a great sound BTW.
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Re: TMB tremolo part deux
Thx!! I left the amp like that .. very fine piece of equipmentTheCoda wrote: ↑Sat 10/24/20 8:45 amI'm reading through the thread and listening to your clips. Are you aware the two links above are the same?Bieworm wrote: ↑Wed 04/22/20 1:47 pmNew voltage chart..after the PR mod. 15V zeners + UF diodes
The fizz is 99% gone. Did recording before and after. Full blast ...
Before PR mod:
https://www.dropbox.com/s/sh56wppb87ti6 ... 3.m4a?dl=0
After PR mod:
https://www.dropbox.com/s/sh56wppb87ti6 ... 3.m4a?dl=0
Nice playing and a great sound BTW.
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