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With ref to your question about the reverb/eq footswitch if you have no eq then the gain boost should be wired up toe the eq if it is not it is a simple mod to do as all that happens is that when the peal is engaed it shunts the mid section down to earth taking it out of cercuit and hence the...

A sure sign of cap death is a change in tone and also extreme death or total failure would bring on motorboating as the cap would no longer filter out the cycle noise when the ac gets altered to dc. When mine where dying I noticed that when I played the bottom strings-low E I got a bit of...

Try replacing the fuse,remove all the output valves (6L6 and EL34) hit the standbye switch if the fuse blows you have a short somewhere if it doesn't then it could be your BIOS is set to low and is drawing to much current! (see forum on watford valves site)

Ref that 6FQ7 it should be V6 and is for the Phase Inverter/Driver Sorry I should have turned the page! never mind that confirms it more.

Have you got another amp with reverb? Try plugging the RCA cables into that if you have and that would eliminate the Pan or Amp. Did you check the wiring as I suggested? it might be permanently shorted down to earth as the previous owner maybe did not want to use reverb. Looking at the...

Ref that Lead/Rythm switch I think for that one you have to have two wires going to it not a + and ground well that's what I've read on ere' but I have not got round to checking it out yet.

Allo matey!! I could not find anything wrong but having read about someone else having a bad RCA plug ( the moulded one ) I thought I'd go for that first. It's the grey lead that plugs into the chassis end I don't think the other end gets disturbed that much so is best left alone. I would...

Hi me again, When I tried jiggling the grey RCA cable nothing seemed to happen but I took the bull by the horn and changed the plug, that cured it. It might be worth plugging the tank into another amp using the current wiring so testing connections and then move on to the PCB it's possible...

If you look at the MkIIb 1981 Old friend post it's got a nice picture of those three wires.

If you check my post you will see all the hassle I've had sorting mine out. The Pedal with the Led plugs into the front and switches the Lead channel in that is controlled by the two pots on the right expect a loud POP when you do this. The other plugs into the chassis underneath you will...

Once I'd re-wired still no Reverb this latest problem stemmed from the Grey RCA plug for the reverb springs once changed all works OK. I'd like to thank Boogiebabies for taking the time and effort to help me My band will be gigging in Belgium/Holland on the 27th December at a place called...

Many thanks Boogiebabies for the gut shots unfortunately as is typical the bit I wanted to see was obscured by wiring.I have finally worked it out I hope so this is it!! The gain/boost goes to an RCA Socket located on the chassis just one wire from the mid pot. ( this was wired to the other...

I'm still lost on this wiring for reverb/eq footswitch. any takers out there please.

I guess I'm all alone then.Bump

Well I seem to be talking to myself :o I think I've finally cracked it. See if you follow my logic. :idea: On the MkIIb they come either with or without EQ those fitted with Reverb/EQ will be wired up to the foot switch socket for switching these in and out those that don't have the EQ fitted...

Bumpy Bumpy!!

I'm wondering now what gives? on the circuit diagram the only foot switches shown are for EQ and Gain Boost and no Reverb are some wired up so that these are switchable and the Reverb is permanant? I still need to know the wiring Please!!!

If you really want to crank the mids you can change the 10k pot for a 25k thus giving you even more mids.Harry

Hi all, Thanks for the chassis photo.unfortunately it does not clearly show the wiring only highlights the fact that mine is completely up the wall. If no one can tell me can anyone post chassis pictures of MkIIb innards mainly showing the Footswitch wiring in glorious Technicolour I can then...

Hi, One last issue with this Mk IIb can anyone tell me the wiring for the footswitch it is not shown on the circuit diagram and I think mine is wrong!! I know the sleeve is shared with the EQ as a common earth but I can't see at what point to wire in the pos or hot side for switching reverb...