Custom Marshall 18 Watt - TMB

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blackwhaleamp

blackwhaleamp

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#1
Hi,

I want to build a custom "Marshall 18 Watt - TMB" amplifier. My idea is just to have the TMB channel, plus a passive Effect Loop and Reverb circuit.

I decided to add the Effect Loop right after the first pre-amp stage, and the Reverb Fender-like circuit right.

I plan to use a solid state rectifier instead of a tube. I also want to add a power scaling. This is not in the circuit, but I have no idea how the London Kits looks like.

Could you please have a look to the circuit, and let me know if it makes any sense for you?

Thanks
 

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#2
Normally an 18W TMB's FX loop is inserted between the last pre-amp stage and PI, so as not to alter the preamp gain structure. Personally, I don't think reverb is beneficial to an 18W, but you could also insert that before the PI.
For simple power scaling just look up the VVR or VRM.
 
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#3
I also think that an FX loop right after the first stage is pretty useless. What effect would you run before a distorting preamp? Besides, the output signal is not really lo-Z, and it will probably too hot for guitar devices. Also from a practical point of view, you can run the effects right before the amp as well then.
 
#4
Agree on the placement of the loop since you need preamp distortion before the loop for it to have value. I return the output of a (parallel) loop to the "other" side of the PI like the Marshall does with it's "other" channel. I do it for phase reasons.
 
#6
Why not? The TT kit should at least solve the level problem.
If it was my amp I would add a hardwired bypass anyway. TT suggest it in the manual too.
Is there a special reason for choosing a 12AY7 in the PI?
 
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