Low wattage Tremolo TMB reverb

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Bieworm
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Re: Low wattage Tremolo TMB reverb

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geoff 1965 wrote:
Thu 07/01/21 11:34 pm
The dissipation and drain are a lot lower on that mosfet Bieworm @ 75W & 4.5 amp,suitable for just the screen voltage but are you going to be the guinea pig that tries it out?
Naahh.. I'm going to build one myself. I found a 800V 5A N channel mosfet that look more interesting..
https://datasheetspdf.com/mobile/919474 ... or/P5N80/1
Only problem is a well priced pot. The max wattage for a good price over here are 0.5W cts pots.. is that ok?
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Re: Low wattage Tremolo TMB reverb

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The schematic shows 1/2W which are rated at 500VDC so that will be okay, “build one yourself” as in the VoCo screen voltage?
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Re: Low wattage Tremolo TMB reverb

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No I'm going the safe path and use stuff from you guys
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Re: Low wattage Tremolo TMB reverb

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Okay Bieworm then the mosfet has to be close to the type & specs I posted earlier,notice the 1M pot is linear as well.
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Re: Low wattage Tremolo TMB reverb

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geoff 1965 wrote:
Fri 07/02/21 1:54 pm
Okay Bieworm then the mosfet has to be close to the type & specs I posted earlier,notice the 1M pot is linear as well.
Do you reckon the 800V 5A 140W mosfet isn't sufficient?
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Re: Low wattage Tremolo TMB reverb

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The others are at least 8amp,plus you have to check the gate,drain & source are the same configuration.i used a 2SK2698 which was 500V,15amp,150W by default”I got the 69 wrong should have been 96 when ordering” it works but i’m going to change to a 900V 8Amp when I build the new chassis for the 6V6 amp.
here's the spec sheet for the NTE2377
nte2377.pdf
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Re: Low wattage Tremolo TMB reverb

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geoff 1965 wrote:
Fri 07/02/21 5:29 pm
The others are at least 8amp,plus you have to check the gate,drain & source are the same configuration.i used a 2SK2698 which was 500V,15amp,150W by default”I got the 69 wrong should have been 96 when ordering” it works but i’m going to change to a 900V 8Amp when I build the new chassis for the 6V6 amp.
here's the spec sheet for the NTE2377
nte2377.pdf
Hey Geoff.. I'm a novice to mosfets. But this one seems to be able do pull it off?
Screenshot_20210703-095137_Samsung Internet.jpg
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Re: Low wattage Tremolo TMB reverb

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Not sure Bieworm,i’m no expert on mosfets myself,I stayed close to the NTE2377 specs when I got mine i.e. TO-3P type
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Re: Low wattage Tremolo TMB reverb

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Josh, is the extra triode from the tremolo TMB going to make a big difference compared to the SL TMB? I mean, is the SL TMB going to sound fat enough?
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Re: Low wattage Tremolo TMB reverb

Post by JMPGuitars »

Bieworm wrote:
Sun 07/04/21 4:27 am
Josh, is the extra triode from the tremolo TMB going to make a big difference compared to the SL TMB? I mean, is the SL TMB going to sound fat enough?
How fat it sounds depends on your build. Use the latest docs, the latest docs are the best.

Here's a couple I made in the past (18 and 36W versions):

https://www.youtube.com/watch?v=PeRZXThV54s

https://www.youtube.com/watch?v=UZ1X5SdKnLc

https://www.youtube.com/watch?v=EB0gux3Wrdk

Thanks,
Josh
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Re: Low wattage Tremolo TMB reverb

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JMPGuitars wrote:
Sun 07/04/21 8:16 am
Bieworm wrote:
Sun 07/04/21 4:27 am
Josh, is the extra triode from the tremolo TMB going to make a big difference compared to the SL TMB? I mean, is the SL TMB going to sound fat enough?
How fat it sounds depends on your build. Use the latest docs, the latest docs are the best.

Here's a couple I made in the past (18 and 36W versions):

https://www.youtube.com/watch?v=PeRZXThV54s

https://www.youtube.com/watch?v=UZ1X5SdKnLc

https://www.youtube.com/watch?v=EB0gux3Wrdk

Thanks,
Josh
Well, that doesn't lack fatness 😄
Do you happen to have a layout for the 18W SL TMB reverb?
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Re: Low wattage Tremolo TMB reverb

Post by JMPGuitars »

Bieworm wrote:
Sun 07/04/21 8:34 am
Well, that doesn't lack fatness 😄
Do you happen to have a layout for the 18W SL TMB reverb?
No, I never did the latest version with the reverb. But you can just compare my two layouts (Trem TMB vs SL TMB), the main difference is the preamp. They're both similar anyway.

I will eventually be making a layout for it when I do a PCB version of it, but I dunno when that will happen. Probably not until I sell more of the TremTMBR PCBs.

Thanks,
Josh
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Re: Low wattage Tremolo TMB reverb

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JMPGuitars wrote:
Sun 07/04/21 1:47 pm
Bieworm wrote:
Sun 07/04/21 8:34 am
Well, that doesn't lack fatness 😄
Do you happen to have a layout for the 18W SL TMB reverb?
No, I never did the latest version with the reverb. But you can just compare my two layouts (Trem TMB vs SL TMB), the main difference is the preamp. They're both similar anyway.

I will eventually be making a layout for it when I do a PCB version of it, but I dunno when that will happen. Probably not until I sell more of the TremTMBR PCBs.

Thanks,
Josh
I will make a layout based upon both types
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Re: Low wattage Tremolo TMB reverb

Post by geoff 1965 »

The power scaling on the Marshall origin amp adjusts the screen voltage like that VoCo Bieworm except it has a 3 way switch instead of a potentiometer,definitely worth looking into that & experimenting.
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