Marshall AVT50 Valvestate 200 Combo blowing main fuse

[Enzo]

OK, for some reason my AVT50 file includes a digital reverb board, but now that I look, my basic schematic is the same as yours.

So remind me and us what we are looking for in the reverb?

[Hanger-18]

As I got this chassis as a already molested(unsuccessful repair attempt) it was missing the power amp board and reverb tank. The only thing I found for reverb is a 4 pin connector on the main board. I want to know if I can use this connection directly to a reverb tank. As in a cable from the 4 pin to the rcas of a new 8DB2C1D?

[Jazz P Bass]

The block diagram shows IC1A driving the tank & IC1B recovering the tank.

avt50_Block Diagram.pdf

[Hanger-18]

The block diagram shows IC1A driving the tank & IC1B recovering the tank.

[ATTACH]39425[/ATTACH]

So am I right in assuming I can attach the spring rcas directly to the CN2 4 pin connection? And figuring which side of the connection is drive and recovery.

[Enzo]

Yes.

It is simple to figure it out. The op amp on the left, IC1a shows its output pin wired to CN2-4, that is the hot to your pan drive, the jack marked INPUT. Pin 3 of CN2 is the return from that jack. Note it is not grounded.

CN2-1 is the hot from the return jack, the one marked OUTPUT, note it feeds an input pin on the op amp. CN2-2 is the ground from the pan output jack.

[Hanger-18]

Thanks