New 36W tremolo TMB project
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Re: New 36W tremolo TMB project
Installed them..
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Re: New 36W tremolo TMB project
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.
Jack
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Re: New 36W tremolo TMB project
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?
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
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
Jack
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Re: New 36W tremolo TMB project
Thx! Didn't think of that option...great tip!!TriodeLuvr wrote: βMon 03/29/21 12:53 amThe 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
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Re: New 36W tremolo TMB project
Ok with a 22uf 500V cap I read 425V unloaded... thats better to start with
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Re: New 36W tremolo TMB project
Heaters are wired, power supply too...
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Re: New 36W tremolo TMB project
"The delivery was not possible due to unforeseen circumstances." Does your postman have IBS or something?
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Re: New 36W tremolo TMB project
I don't understand either. I was notified the postman was coming yesterday. My daughter was home all day but never saw the postman...JMPGuitars wrote: βMon 03/29/21 7:09 pm"The delivery was not possible due to unforeseen circumstances." Does your postman have IBS or something?
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Re: New 36W tremolo TMB project
The postal services gave the parcel to the wrong mailman yesterday.. and today they can't find it anymore... I'm just furious!!!!
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Re: New 36W tremolo TMB project
WOW!! That's terrible. The tracking number says delivered.
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Re: New 36W tremolo TMB project
This is crazy. I called them and they are gonna start an investigation. That can take up to 2 weeks... this is really incredibleJMPGuitars wrote: βTue 03/30/21 10:37 amWOW!! That's terrible. The tracking number says delivered.
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Re: New 36W tremolo TMB project
Hopefully whomever received the package will be honest and deliver it to you quickly.
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Re: New 36W tremolo TMB project
Yeah, but it needed to be paid in cash or electronically to the postman. The customs fee and taxes. Otherwise they don't hand it over. I can't imagine anyone doing that for a parcel they didn't order...
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Re: New 36W tremolo TMB project
If it ain't here by the weekend I'll be forced to go turretboard ... I don't believe it will ever be found if it ain't found tomorrow.
Same postal services managed to lose a new laptop I ordered for my son last year. After weeks and weeks of telephone calls and emails I was forced to buy another one because they couldn't find it... amateurs!!!!
Same postal services managed to lose a new laptop I ordered for my son last year. After weeks and weeks of telephone calls and emails I was forced to buy another one because they couldn't find it... amateurs!!!!
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Re: New 36W tremolo TMB project
Wow. You're making the USPS look amazing right now. I guess we should have used another carrier.
I'm guessing whomever paid for it will probably want to get their money back when they figure out it's not very useful to them...or watch, in a week a mysterious new member on this site will start posting photos of their build with the PCBs.
I'm guessing whomever paid for it will probably want to get their money back when they figure out it's not very useful to them...or watch, in a week a mysterious new member on this site will start posting photos of their build with the PCBs.
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Re: New 36W tremolo TMB project
Well.. I would be fine with that. The more TremTMB, the better
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Re: New 36W tremolo TMB project
You could have told me that a week ago.TriodeLuvr wrote: βTue 03/30/21 4:06 pmMaybe you shouldn't have labeled the package "Killer PCBs."
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Re: New 36W tremolo TMB project
Ok...apparently the package is once again on its way in delivery mode. Fingers crossed!!!
BTW, I made a new frontplate with the exact line up according to the latest PCB version. Less room for error...
Edit: it's arrived!!!!
BTW, I made a new frontplate with the exact line up according to the latest PCB version. Less room for error...
Edit: it's arrived!!!!
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