Mesa boogie heartbreaker No reverb

[pontiacpete]

So this amp came in with no reverb. I check the tank and find one of the small wires broken off at the jack. Soldered it back in place but no reverb. I check the transducers and find one open. Change tank with a similar one, an ‘AB’ type. Still nothing. Changed the RCA cable, and again no verb. Now I start changing tubes and cleaning sockets and re-tensioning the sockets. No luck. Even though the transformer measures Out fine with the ohm meter I swap in a new one and still nothing. Oh forgot to mention the voltages are looking good. Got high voltage on pins 1 and 6. Got low voltage on pin 3 and 8.
When banging on the tank there’s the usual crash but not that loud.
The end of the input wire to tank there’s a hum when touched.
Tried hooking up a speaker to the input RCA cable, no sound.
I’m running out of things to check.
Can someone shed some light on this problem?

[Pedro Vecino]

You could have some problem with the grounding scheme of the tank (fifth digit of the code). Many times, in Roadster, Road king and others, using Fender type tanks I have been forced to connect the grounds of RCA plugs to each other internally.
Without that connection these tanks (4AB2C1B, for example) don't work in them.

[pontiacpete]

Thanks Pedro that did it!!