Mark IV Reverb going in and out

[miguelk]

I just re-tubed my Mark IV shortbody combo with full set of JJ 12AX7's & 6L6's. Now the reverb is shutting off after the amp warms up. Flipping the standby switch will get it back for a few minutes, but it eventually shuts off again.

I tried re-seating the reverb tube, and even swapped it with another pre-amp tube. The former reverb tube works great in its new preamp position. Problem still there.

Anyone have an idea where I may have gone wrong?

 

[srf399]

Check to see if the wire connector from the tank at the chassis is pluged in all the way.... Seriously. I has a similar problem and it may be that it pulled out a bit when you were in there changing the tubes