TMB tremolo part deux

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Classic 18

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Josh

the matter of the FX loop...

Is this schematic correct? I adapted this from the EF86 Xtra.
I want to use a stereo cable for this. So on the pedalboard I will make a stereo jack plugin for the reverb and delay pedals...

[JMPGuitars]

Josh

the matter of the FX loop...

Is this schematic correct?

That's not correct. You're missing two resistors, and the jack won't work that way. You need the send and receive to connect to each other directly when nothing is plugged in so the 68K resistor is bypassed. There are stereo jacks where you can make that all happen, but not as you have it drawn.

[Bieworm]

The brothers...

[JMPGuitars]

Very nice...but where's the logo?

[Bieworm]

Very nice...but where's the logo?

Nice remark!!.. The glue was curing overnight

[Bieworm]

New 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

[JMPGuitars]

New 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

Ha, 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]

New 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

Ha, 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?

That's the odd thing with recordings. They never really reflect what hou hear when your playing.
Bottom line: it cured the disease most certainly!

I tested both amps on max vol. The TMB trem is significantly louder than the classic 18. Probably the higher speaker efficiency and the SS rectifier from the TMB...

[zaphod_phil]

The brothers...

The Blues Brothers?

[Bieworm]

The brothers...

The Blues Brothers?

Moet like Angus and Malcolm

[zaphod_phil]

It's there, but way less. I cranked it earlier. PR is still required I think...
Will do tomorrow..the clip

BTW... The 100k resistors at the PI...why do you mark them otherways? Are they a specific type of resistor and why?

Those appear to be carbon composition resistors, which are only recommended for use as PI load resistors. In that position, they help produce asymmetry, so you get more even harmonics generated, and the noise they produce isn't significant relative to the large signal levels at the PI output.

[Bieworm]

Josh... I owe you clips from the tremolo TMB too now...

FX loop is operational and very good!!!

But going to do that tomorrow

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15889632572408607099277039594595.jpg

[geoff 1965]

just been testing that effect loop today and it handles all the modulating effects very well, i have a series passive loop in my lite2 and effects like reverb & delay are okay but some others cause problems.

[Bieworm]

https://www.dropbox.com/s/vwcaxvfws1fsu ... p.m4a?dl=0
This is one badass amp!!!

The gain is on very light until minute 1.45..
4x the same riff ..
2x no reverb, 1 soft picked and 1 hard picked.
2x with verb, 1soft picked and 1 hard.. notice the touch sensitivity!!!
From minute 1.45 I turn up the gain half way..
This is an awesome amp!!!

[JMPGuitars]

https://www.dropbox.com/s/vwcaxvfws1fsu ... p.m4a?dl=0
This is one badass amp!!!

Agreed! That amp sounds awesome. Nice work.

[Bieworm]

Josh, I was testing stuff with a 5W 24V zener between the rectifier and the first filter cap.
B+ dropped as expected. But the voltages on the PI did too..as expected...
What is your opinion on that?
Took it a little further by parallelling another 8.2k from B+ point B to C, ending up with 4.1k. That helped some, but the powertubes went lower in plate and grid voltages.
Just testing here...
Is there any way I can get the PI back up to spec without the 4.1k tweak?

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15893987691391083130513156225186.jpg

[JMPGuitars]

I like the red voltages. Go back to that, and see how it sounds.

[Bieworm]

Josh, I was wondering... the cathode caps and resistors of V2.. are they responsible for the huge boost in overdrive? I have yet to find a TMB that drives so hard as this one.. that is the only part that I can't find in other TMB designs.. on the trinity SIII those caps aren't there.. only a 2.7k and a 56k to ground. Where did you get your inspiration for that? Just trying to understand it...

[JMPGuitars]

Josh, I was wondering... the cathode caps and resistors of V2.. are they responsible for the huge boost in overdrive? I have yet to find a TMB that drives so hard as this one.. that is the only part that I can't find in other TMB designs.. on the trinity SIII those caps aren't there.. only a 2.7k and a 56k to ground. Where did you get your inspiration for that? Just trying to understand it...

Ha, you need to look at the bigger picture. That V2 isn't in the circuits you're referring to. That tube is increasing the gain, and driving the tone stack.

The amps you're comparing to are 2 channel amps with the same amount of preamp tubes, but the first 2 preamp tubes are only used 1 per channel in them.

I was also going to experiment with a 12AT7/ECC81 in the V2 position if I think the gain is too much when I build mine. You can try that if you want.

Thanks,
Josh