Lawrys 8 Watt Valve Amp with Tremolo

[wokkaboy]

ok back to the correct thread. Think I've almost caught up to Gavmiesters posts !
Good news on the re-biasing.
Might have a crack at one of these amps Loz, might hunt down a cheap box/speaker that has the amp components not working

[maxaxe]

Good Gravy, this forum just gets more & more interesting . . .
Some clever dudes out there

[keloooe]

Loz, I'm guessing the bottom middle circle is the output and the circle with f/s on it is the foot switch jack?
And what is on the ends of the red wire with "active" marked next to it?

[lawry]

Hey Pest.
You are correct. The 'circle' is the output jack and the F/S is for a foot switch to turn on/off the tremolo. Without a foot switch the tremolo is on all the time so you have to turn the Depth knob down to stop it.
The wire marked 'active' is the bitey part of the incoming mains power. That is, the Active wire containing 240 volts AC that goes to the fuse F1. In AC you have Active and Neutral.

[Gavin1393]

Parts have arrived!!!!

Lawry, any chance of you sending me a PDF to gavmeister@pitbullguitars.com? Thanks mate!

[DrNomis_44]

@ Lawry Looks like a pretty cool little design for a Valve guitar amp, I'm going to be ordering some new bits and pieces for my Soldano amp this coming Tuesday, going to replace all the existing pots with some new CTS pots.

[FrankenWashie]

Wokka wants to know if the tremolo modulates the volume.
Yes it does. It modulates the 'ground' reference of the two output pentodes thereby causing the amplitude to vary.

I know all of those words, but when you put them together like that I'm lost

[Gavin1393]

I’m finally going to get around to building this….it might be considered vintage given how long it’s taken…the joys of retirement!

[WeirdBits]

Good luck!

[DrNomis_44]

Here's a suggestion for a mod to the original design, why not add a switch that allows you to switch between a Tube Rectifier and 1N4007 silicon power diodes? that way you can choose between the two.