Good thinking my friend!
Yes ! one can get variable trim-cap 250-1180pF, but I’m not sure about voltage though. Usually they are 100v max.  Made by Sprague-Goodman (US) and Murata (Japan).


Hi telecaster,

Yes you are correct! OTS 100 and 50 are identical and all mods apply to both of them.
100w already got 200mF filter caps so no change there.
Cheers

Hi Mcinku,

I have some pics and I'll try now, but soon I have to open my amp (again ) and I'll take more pics.

Be cool

  

That was FAST.

thanks man

Just done the V1 and V2 mods today, leaving FET/Boost and Rock/Jazz switch mod for another day. Finished off a new footswitch with a 5 pin XLR socket on the switch so I will be able to swap cables easily.

Very impressed with the mod to V1 caps. Like it best with no cap in place of the .047. Much fuller sound.

V2 mods are a big help with treble on OD channel.

Anyone in the UK know where I can get 5 core flexible (and I don't just mean flexible like lighting flex!) cable for footswitches?. I'm currently using 7 core automotive cable but its a little too rigid, could do with something better.

Thanks Pickmaster. I just wonder if that cable has large enough cores for a 5m cable or whether I'm going to get too large a voltage drop. I've since found this

http://www.evelcables.co.uk/epages/Store2_Shop1476.sf/en_GB/?ObjectPath=/Shops/Store2.Shop1476/Products/SY5C0.75

but they want £10 for delivery for  approx £5 worth of goods!


By the way, when I did my mods I had to substitute some cap values since I couldn't get the exact same ones, but I guess thats not necessarily a problem, but with resistors I'm never sure of the voltage/wattage rating required. Nik uses three types the standard colour ring versions , Dale and another brown bodied one with writing on. Where would I get these in small quantities? RS won't do less than 25 a time of most stuff of this value. I got most of my caps from Hotrox as they are local but his stock of resistors amounts to 4 differing values!

Thanks again for posting those mods.

For sounds scroll down on the pages here:
http://www.guitarampcab.com/overtone.html

and here:
http://www.guitarampcab.com/fatty.html

Cheers

Has anyone tried mic cables for the footswitch?. I wonder if the small conductors will drop the voltage too much and prevent the relay working reliably.

I did wonder whether 3 conductors would do the trick only my electronics knowledge is not sufficient to have worked it out. I'm pretty much toed to 5 pin XLR's now since I've built the new footswitch, bought all the connectors to convert the original, my pedal board etc etc. And to think I could have got away with mic cable and a stereo jack socket.

Would you be so good as to show us how you wire the footswitch for this?

Many thanks

Hywel Harris