New 36W tremolo TMB project

Double-Bubble! Place for discussing the 36W version...

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Re: New 36W tremolo TMB project

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JMPGuitars wrote: ↑
Tue 03/23/21 11:58 am
Bieworm wrote: ↑
Tue 03/23/21 11:12 am
Ah crap.. it's something my wife ordered online..in my name.
hahahahahahaahahah
Djeeezes Josh !!! You're ruining my high...
Anyway, there's a lot of work before I can start building. First prep the chassis.. transformer wiring , heater stuff... the zen time has already begun. I'm in the flow..
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Re: New 36W tremolo TMB project

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I changed the layout of the faceplate..
20210324_210323.jpg
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Re: New 36W tremolo TMB project

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Looks great!
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Re: New 36W tremolo TMB project

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Thanx!
Drilling job done for bottom and front. Still have to draw the back and I can only drill the holes for the PCB mounting when I receive it...
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Re: New 36W tremolo TMB project

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A small look into the future...
20210326_213406.jpg
Btw.. just got mail from the post office. It's going to be delivered... customs charge an extra 42€ !!!!! Criminals!!!!😠

Btw 2: I just noticed when installing the pots that you changed the layout sequence of the control plate... now I've gotta be careful with the wires from the board to the pots and not follow the layout there.
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

Bieworm wrote: ↑
Fri 03/26/21 3:39 pm
Btw.. just got mail from the post office. It's going to be delivered... customs charge an extra 42€ !!!!! Criminals!!!!😠

Btw 2: I just noticed when installing the pots that you changed the layout sequence of the control plate... now I've gotta be careful with the wires from the board to the pots and not follow the layout there.
WTF??? That's $50 USD! The total on the customs label is $65 USD. How are they charging 77% tax?! Wow, that's really special.


Yeah, be careful with wiring the pots. I didn't pay attention and had to redo two of the pots on the head version. Oops. lol
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Re: New 36W tremolo TMB project

Post by Bieworm »

JMPGuitars wrote: ↑
Fri 03/26/21 5:10 pm
Bieworm wrote: ↑
Fri 03/26/21 3:39 pm
Btw.. just got mail from the post office. It's going to be delivered... customs charge an extra 42€ !!!!! Criminals!!!!😠

Btw 2: I just noticed when installing the pots that you changed the layout sequence of the control plate... now I've gotta be careful with the wires from the board to the pots and not follow the layout there.
WTF??? That's $50 USD! The total on the customs label is $65 USD. How are they charging 77% tax?! Wow, that's really special.


Yeah, be careful with wiring the pots. I didn't pay attention and had to redo two of the pots on the head version. Oops. lol
Yeah, crazy taxpeople... don't worry anyway.. this is my special project and most certainly a keeper amp.
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Re: New 36W tremolo TMB project

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Some progerss...
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

Very nice. I'm curious to hear what this sounds like with 6L6s. And also when you eventually change it to EL34s. πŸ˜‰πŸ˜‰
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Re: New 36W tremolo TMB project

Post by TriodeLuvr »

That's a beautiful chassis, and lots of great parts going into it, too! 6L6 is a terrific tube with a long and distinguished audio history, and its many variants played a major role in WWII. My first tube gear built from scratch used a 1625, and I still have a stash of NOS Mullard 829B looking for a good home. Seriously, if I told you the lengths I've gone to in order to use some of the lesser-known types (like the 1222), you'd know I'm certifiable. Good luck with that amp!

Jack
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Re: New 36W tremolo TMB project

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I'm pretty positive there will be EL34 tubes in it at some point. But the 6L6 is a great tube in other amps I own, and I'm curious how it will behave in a marshall type of circuit..
The fact that everybody else automatically thinks EL34 will probably have its reasons...
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Re: New 36W tremolo TMB project

Post by Bieworm »

Josh, I bought some UF5408 diodes for the rectifier. But they are fairly large. Problem is the UF4007 isn't available around here. Is the size of the 5408 a problem for noise?
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

Bieworm wrote: ↑
Sun 03/28/21 5:37 am
Josh, I bought some UF5408 diodes for the rectifier. But they are fairly large. Problem is the UF4007 isn't available around here. Is the size of the 5408 a problem for noise?
Why would it have any effect on noise? It's the same thing, but 3A instead of 1A.
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Re: New 36W tremolo TMB project

Post by Bieworm »

JMPGuitars wrote: ↑
Sun 03/28/21 6:11 am
Bieworm wrote: ↑
Sun 03/28/21 5:37 am
Josh, I bought some UF5408 diodes for the rectifier. But they are fairly large. Problem is the UF4007 isn't available around here. Is the size of the 5408 a problem for noise?
Why would it have any effect on noise? It's the same thing, but 3A instead of 1A.
That's what I was thinking too when ordering them. But now I took a closer look and the difference in size is immense.. started to make me wonder if it would have an impact on the noise level. Thanks for clearing this out for me..
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Re: New 36W tremolo TMB project

Post by JMPGuitars »

Bieworm wrote: ↑
Sun 03/28/21 7:27 am
That's what I was thinking too when ordering them. But now I took a closer look and the difference in size is immense.. started to make me wonder if it would have an impact on the noise level. Thanks for clearing this out for me..
UF5408: Height: 5.3 mm, Length: 9.5 mm
UF4007: Height: 2.72 mm, Length: 5.21 mm

I mean, (not quite) double tiny is still pretty tiny. ;)
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Re: New 36W tremolo TMB project

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Installed them..
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Re: New 36W tremolo TMB project

Post by TriodeLuvr »

Bieworm wrote: ↑
Sun 03/28/21 5:37 am
Josh, I bought some UF5408 diodes for the rectifier. But they are fairly large. Problem is the UF4007 isn't available around here. Is the size of the 5408 a problem for noise?
Those look the same as the ultra-fast 3A rectifiers I use in doublers - GI856. The original General Instruments diodes are no longer available, but On-Semi makes a replacement, the MR856. I've compared the recovery time of the two using a scope, and they're virtually identical. These are neither better nor worse than smaller diodes in terms of noise. All rectifier diodes need to be kept away from high gain stages and 1M volume controls.

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Re: New 36W tremolo TMB project

Post by Bieworm »

Here's a possible stupid question...

I wired the PT from wall power to rectification. I was a fool not to check the HT voltages prior to attaching the diodes. It's all soldered and heatshrink isolated, so I don't have checkpoints for the HT voltages. I will address that anyway... but for now there is an oddity in voltage. I read 236VAC on the wallpower in the amp. But I read 275VDC after rectification. The HT would normally be 300V unrectified. Is this normal at this stage, being nothing else wired except the HT wiring? Is this voltage going up as the rest is being wired with filter caps and such?
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Re: New 36W tremolo TMB project

Post by TriodeLuvr »

The unfiltered output of a SS rectifier is pretty ragged. Your meter probably can't read it correctly. If you're concerned, you could clip lead in a small cap like 10uF or so and check again.

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Re: New 36W tremolo TMB project

Post by Bieworm »

TriodeLuvr wrote: ↑
Mon 03/29/21 12:53 am
The unfiltered output of a SS rectifier is pretty ragged. Your meter probably can't read it correctly. If you're concerned, you could clip lead in a small cap like 10uF or so and check again.

Jack
Thx! Didn't think of that option...great tip!!
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