New 36W tremolo TMB project

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Bieworm
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Re: New 36W tremolo TMB project

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JMPGuitars wrote:
Fri 04/02/21 10:53 am
Bieworm wrote:
Fri 04/02/21 10:44 am
Josh.. I'm missing a 2uf cap for the cathode of V2B. I do have a 2.2uf 63V electrolytic cap. Should do the job, no?
I use a 3.3µF there, I think you'll be fine. ;)
Why 3.3uf? Halfway cold clipper kinda thingy?
Question about the non using the fx loop..for now..it looks like there are parallel solder terminals to the 68k terminals. I guess I have to put a jumper wire in there.. correct?
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

Bieworm wrote:
Fri 04/02/21 11:39 am
Why 3.3uf? Halfway cold clipper kinda thingy?
Question about the non using the fx loop..for now..it looks like there are parallel solder terminals to the 68k terminals. I guess I have to put a jumper wire in there.. correct?
For more bottom end.

Yes, jumper if not using the 68K, or connect the wire further back if not using turrets. Solder the jumper on the top of the board in case you change your mind.
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Re: New 36W tremolo TMB project

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Here is some progress.. did some more power amp wiring. And I put a ground buss at the pots. It makes it easier on wiring the shields of shielded wires. I always find it hard to add the shielded wires at the pots... mostly because I already soldered the grounds and have to add the shields afterwards..
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Re: New 36W tremolo TMB project

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Bieworm wrote:
Sat 04/03/21 2:52 pm
Here is some progress.. did some more power amp wiring. And I put a ground buss at the pots. It makes it easier on wiring the shields of shielded wires. I always find it hard to add the shielded wires at the pots... mostly because I already soldered the grounds and have to add the shields afterwards..
It might be fine, but technically the shields should not be sharing the preamp grounds. Shields are supposed to have their own connection to ground.

Personally, I shield the other end on the terminal strip using the ground lug.

If you find the preamp to be noisy, reverse the gain wire shielding end.
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Re: New 36W tremolo TMB project

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Thx for the tip!
In that case I need do put the shield of the input wire at the tube socket... but will leave it as is for now. If there's noise I will redo it ..
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

I just noticed... one of your outer foils is facing the wrong way.
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Re: New 36W tremolo TMB project

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JMPGuitars wrote:
Sat 04/03/21 4:10 pm
I just noticed... one of your outer foils is facing the wrong way.
Ah crap yeah!!! And a pretty significant one too.. sigh
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Re: New 36W tremolo TMB project

Post by TriodeLuvr »

Bieworm wrote:
Sat 04/03/21 5:21 pm
JMPGuitars wrote:
Sat 04/03/21 4:10 pm
I just noticed... one of your outer foils is facing the wrong way.
Ah crap yeah!!! And a pretty significant one too.. sigh
Might not make a difference, depends where it's located in the circuit. The purpose of caps generally is to conduct AC signal from one end to the other with as little impediment as possible. On that basis, if the cap acts like an AC short, it doesn't matter which end is the foil.

Jack
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Re: New 36W tremolo TMB project

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TriodeLuvr wrote:
Sat 04/03/21 7:35 pm
Bieworm wrote:
Sat 04/03/21 5:21 pm
JMPGuitars wrote:
Sat 04/03/21 4:10 pm
I just noticed... one of your outer foils is facing the wrong way.
Ah crap yeah!!! And a pretty significant one too.. sigh
Might not make a difference, depends where it's located in the circuit. The purpose of caps generally is to conduct AC signal from one end to the other with as little impediment as possible. On that basis, if the cap acts like an AC short, it doesn't matter which end is the foil.

Jack
Thanks Jack..
But I want the amp a right as possible. It's the cathode cap that has the negative end right there at the conjunction of itself and the end of the entire pot ground string..
Seems like the potentially largest noise introducer on the preamp ground.
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Re: New 36W tremolo TMB project

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OTOH...couldn't I scope the difference in noise like it is built in now? It only is connected to ground side. If the difference in measurement is small enough I can let it be since it will be not so obvious in the end?
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Re: New 36W tremolo TMB project

Post by TriodeLuvr »

If it's a cathode bypass cap, and it's not electrolytic, it won't matter. In addition to everything else, the operating impedance at that point is low and not susceptible to noise pickup.
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

I don't know how perceivable the difference would be over 1 cap's direction, but I've never seen anybody make an exception for cathode caps. I've also made plenty of quiet amps before I ever started marking the foils, so obviously the foil direction is not the most important point in building an amp...but it seems to help.
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Re: New 36W tremolo TMB project

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V1, 2 and 3 wired...
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Re: New 36W tremolo TMB project

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Damn... it's finished. Voltages are on the high side, but wall voltage is extremely high at the moment, so I will have to wait before I zener this one down.
All in all pretty in the same ballpark, so I decided to light it up. Biased at 83%, so is this safe? It says 24.8W/ tube ... on a 36W OT???. Man this sounds huuuuuge!!!!

https://www.dropbox.com/s/qg5bekvobi8ty ... e.m4a?dl=0
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Re: New 36W tremolo TMB project

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Ok, so I added a IN 5359 zener, 5W 24V... now we're in business!
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