boobtube twin revisited

[juansolo]

Yeah that's in the right place as per Cleggy's suggestion.

[sonolink]

Great!!
Thanks John. I'll keep you guys posted!!!
Cheers 
Sono

[sonolink]

BTW, It´s a Hammond 1590BB box you used?

Cheers
Sono

[juansolo]

1590XX

A BB would be very snug!

[sonolink]

Good thing I asked hehehe!!
Thanks mate!

[sonolink]

I'm trying to cut down on things as much as possible since I now have more switches and knobs than the original project. So I'm thinking of customizing a double gang pot to have a single Master knob that depending on SW4 position would act as 1Mlog or 100klog Master output. (It's a matter of swapping wafers basically)

On the same line of thought I'd like to ask: is the Presence knob really necessary? Is it's role rather important?

Thanks

[juansolo]

I'm trying to cut down on things as much as possible since I now have more switches and knobs than the original project. So I'm thinking of customizing a double gang pot to have a single Master knob that depending on SW4 position would act as 1Mlog or 100klog Master output. (It's a matter of swapping wafers basically)

On the same line of thought I'd like to ask: is the Presence knob really necessary? Is it's role rather important?

Thanks

It can be a trimmer as you only need to change it really depending on what you plug it into amp-wise. If it's always the same amp it can be set and forget.

[sonolink]

Great!! I'll definitely go for that then. A trimmer inside will give me more room

Thanks John!!
Cheers
Sono

[sonolink]

Probably a dumb question but I've been checking the pics of the guts you have posted along the thread and cannot figure out what you use to hold the boards in place!! They look like they're floating held by the cables!! Could you share what you use please?

Cheers
Sono

[juansolo]

Part of it is the cables as it's all solid core in those builds. But the board is secured to the back of the pots using Scotch tape.

[sonolink]

Clever!

Cheers
Sono

[PaulL]

Lovely.

I agree about using tubes at higher voltages. They just don't seem to sing otherwise.

I just let the wires hold the board in place too. I was worried until now.

[sonolink]

Maybe a dumb question but lately I've been asking myself:

Why a 9v converter? If it needs nearly 2A to work and the best way to feed it is with a separate PSU such as the Truetone One Spot why not have directly a 240VAC input?

Just out of curiosity
Cheers
Sono

[m-Kresol]

I would guess it's because standard centre negative plugs and cables are not made for such high voltages. Also, you would need another circuitry internally for heaters.

not to speak of high voltage dangers..

[sonolink]

Sorry what I meant is why not going directly from a 240VAC outlet into the pedal and inside the pedal have a PSU converting that into whatever is needed by the effect? After all we're using a One Spot that converts 240VAC into 9v, and inside the pedal the charge pump is converting those 9V into 190VDC and 6V for the effect...

Just wondering...
Oh and of course I wouldn't use a standard coaxial DC cable for that...
Cheers
Sono