Hot Rod Deluxe issue

[Valvehead]

the voltages on the relays appears normal.

Clean is a normally closed contact, when the relay is not energized. 16 volts on both ends of the coil.

Check that the contacts of k1 are switching.

Use an ohmeter.


No connection/ switching according to meter .

With the clean channel on, the wiper of the clean volume pot should connect to the junction of r41 & r44.

Yes -

when you engage drive, this connection should no longer be true.

Still connected !

The wiper of the drive pot should now connect to r41/44.


Wiper is not connected

edited with anSwers


AND THANKS FOR YOUR HELP MAN !

[g1]

That's bizarre. Did you measure those voltages right on the relay pins? K1 and K2 coils are in parallel. If K2 switches then K1 should switch but you don't even hear it click. If the voltages are correct on the actual pins (same voltage as K2), which you have verified, then K1 must be bad.
I know you replaced it but there is still that tiny chance the new one is bad. I would swap K1 and K2 and triple check those voltages at the K1 coil comparing against K2 coil.

[Enzo]

Or the traces from one to the other are open somewher.

[Valvehead]

ok-- i swapped the 2 relays.

BUT--when i pulled k1 out i broke a leg. I had another relay sitting here to use--BUT , dont know if its good or not --it is installed as k2 .

So, some things changed-

K1 now audibly cliks, K2 does not

the clean ch volume is now correct--operates on clean ch. only.

On the dirty channel (ch.2) , now the Master volume does nothing at all. The drive level now works, increases gain, but it is also the volume of the channel!

the more drive switch works properly.

the LED now seems proper ?? blank on clean , yellow on drive , red on More drive

[g1]

The relay installed as K2 is no good.

[Valvehead]

ok...i need to do a Mouser order tonight anyway---ill grab one---see ya in 4 days

[g1]

Forgot to ask, any chance that pin that broke from K1 was already broke before you removed it? That would explain how you could have measured proper voltage at the pin yet the relay wouldn't switch.

[Valvehead]

not sure.

regardless, i just ordered a new relay

[Valvehead]

ok--its fixed !!

replace k2 relay and the amp is working great

thanks everyone for your time and knowledge !!!