The Amp Garage

Hello there. To anyone who has tested this in their amp, would like to ask if it is ok to wire the dual rectification this way.
Thanks!!

Finally I got a pop when switching channels using 1M resistor in relay.
Will try 2.2M !!

Hello. This is my 18W TMB version base on Trinity TMB but with some mods: * Channel switching with relay * HI/LOW sensitivity switch for each channel * VVR power scaling (just power amp) * heater elevation * Dual rectification TMB_2020_3.png Whats your opinion on ow the heater elevation and dual rec...

I think it would be best to switch the input of either of the routes that were “offline” to ground because they would be amplifying if in the signal path or going crazy just floating. I’ve done it as I’ve described with a DPDT switch and it works. I’ve never tried it as illustrated in the schematic...

Lauri wrote: ↑Thu Dec 05, 2019 8:47 am There needs to be a resistor to ground on the lower channel after the 0.022µF cap before the relay. Otherwise it will pop loudly when changing channel.

dual ch design-popprevent.png

Thanks for your suggestion!!! I thought about popping problems as well, but didnt not where to put that resistor!

hako wrote: ↑Wed Dec 04, 2019 11:06 pm +1
The 47k is a grid stopper, the grid leak resistor is the 1M at the input jack.
The main purpose of the gs is to prevent noise (rf) and i would use two of them, right at the grid of each preamp tube....

Ahhh. You re right!
Thanks for your tip. It would be one resistor for each stage then.

I think it would be best to switch the input of either of the routes that were “offline” to ground because they would be amplifying if in the signal path or going crazy just floating. I’ve done it as I’ve described with a DPDT switch and it works. I’ve never tried it as illustrated in the schematic...

Hello everyone!
I have a question regarding this dual channel schematic I found somewhere on the net.
Shouldnt the 47K grid leak resistor (see green line) be switched with the relay as well, so the inactive channel is not amplifying a signal all the time?

Thanks!