Josh's 18W Tremolo TMB Builds

[Bieworm]

Josh, I drew them from scratch in Paint. They are just built up the same way, because I don't know any better.
I used a layout which I altered, nothing wrong intended. But I removed it just now. I'm sorry man...won't happen again.

You edited my graphics in paint. It looks like you or somebody removed one of them already, but my schematic FX loop is still on there: https://el34world.com/Forum/index.php?t ... #msg288799

Please remove that also. I spend a lot of time on that stuff and provide them for free. I only ask they aren't posted on other sites or used for commercial purposes.

Thanks,
Josh

Done

[JMPGuitars]

Done

Thanks! BTW- check out your thread I replied to. That reverb is another version of the same 1 tube reverb I use, but ZP and I made my version nicer.

[geoff 1965]

Definitely interested in your reverb Josh just busy working on my 18W and 6V6 projects at the moment.but here’s my first question: are you limited to using a certain tank in your circuit i.e. i’ve always liked the full size accutronic tanks in the peavey’s

[JMPGuitars]

Definitely interested in your reverb Josh just busy working on my 18W and 6V6 projects at the moment.but here’s my first question: are you limited to using a certain tank in your circuit i.e. i’ve always liked the full size accutronic tanks in the peavey’s

Tank size isn't exactly relevant. I use two different models, one is small, one is big. What you need is the correct (or close enough) impedance rating for the reverb driver.

[JMPGuitars]

This is what I use:

Reverb Driver:
Hammond 1750A
OR
ClassicTone 40-18034
Either Model's Secondary Impedance: 8Ω

Tanks:
8AB2A1B, Medium Decay, 3-Spring - Input: 10Ω
9AB3C1B, Long Decay, 3-Spring - Input: 10Ω

[geoff 1965]

thanks for sharing that Josh, in your opinion which tanks do you think are best,accutronics or MOD?

[JMPGuitars]

thanks for sharing that Josh, in your opinion which tanks do you think are best,accutronics or MOD?

Both sound great, but I usually get MOD. I forget everything that pushed me in that direction, but I remember that one of the reasons was because the MOD tanks include the cushy mounting stuff attached.

There was more to it than that, but I'm not getting any younger.

[geoff 1965]

yeah i've seen good feedback on the MOD's, so what's the resistance of the reverb potentiometer you're using and is it log or linear?

[JMPGuitars]

yeah i've seen good feedback on the MOD's, so what's the resistance of the reverb potentiometer you're using and is it log or linear?

A1M

EDIT: wow, I just realized the pot I used in my Tremolo TMB is a push-pull switch. I haven't even tested that out yet. Whoops.

[geoff 1965]

Which tank is in the combo Josh,the medium or long decay?

[JMPGuitars]

Which tank is in the combo Josh,the medium or long decay?

The larger one is in the combo, but you haven't heard it yet. The demo I posted was with my test tank, which is an Accutronics. MODs get installed in stuff, that one will always be on the bench since I don't have to worry about installation issues.

[JMPGuitars]

Check it out, I wired up a footswitch for the combo amp:

footswitch1.jpg

The shell for the footswitch should be here tomorrow, and then I'll record a demo.

[ViperDoc]

Nice footswitch lights. Very cool!

[geoff 1965]

When you do the demo Josh can you dedicate a section to the reverb without tremolo? i never use tremolo effect myself and I really liked your 36W head demo “which decay was that?”
nice work!

[JMPGuitars]

When you do the demo Josh can you dedicate a section to the reverb without tremolo? i never use tremolo effect myself and I really liked your 36W head demo “which decay was that?”
nice work!

Typically I throw the smaller can in heads due to space limitations. Larger tanks in combos, or not. They both sound good.

Nice footswitch lights. Very cool!

Thanks!

[geoff 1965]

Which driver tube do you use,12AX7 or 12AT7?

[JMPGuitars]

Which driver tube do you use,12AX7 or 12AT7?

AX7. My reverb is a modified/improved version of the single tube reverb.

[geoff 1965]

zooming in on the reverb cathodes Josh! it looks like you have sprague 25uf's but it's blurring when i zoom on the resistors,do you have the same resistance on both cathodes?

[JMPGuitars]

zooming in on the reverb cathodes Josh! it looks like you have sprague 25uf's but it's blurring when i zoom on the resistors,do you have the same resistance on both cathodes?

Nope, and those caps aren't the same size.

[Bieworm]

Which driver tube do you use,12AX7 or 12AT7?

AX7. My reverb is a modified/improved version of the single tube reverb.

Can you define 'improved'? What makes it better?