Effect loop issue

[MKibanez]

Ok here is my setup, a TC G major in the effect loop of my Mesa Rectoverb 50, the volume of the loop on the head is around 1 oclock. Last week my 2 EL 34 burned so I had them changed of course at a chop near my place. Yesterday I plugged back my setup and there is a big difference in the volume of the effects that goes in the loop. The effect is now very low volume compare of what I had before!!! Do you think there is a link between the tubes change and the loop?

Thanks for your help.

 

[Dave L]

No, I don´t think changing power tubes should have any connection to the loop - unless the dying tubes made some damage elsewhere in the amp. Does the Rectoverb have a tube-driven loop? If so, that tube sounds like a more likely culprit.

Assuming that everything is set up just like it was before, of course.