fender amps on ebay

Reverb Fender Blues Jr. broke!?
I just bought a Blues Jr. off eBay from a seller you trust. The only problem is no reverberation work. When the reverb is "0" everything sounds fine, but when his time there is a strong buzz and does not add reverb to pitch, when it rises to 12 is not a ridiculous amount of buzzing / humming and still no reverb. All tubes are light and everything seems intact, the amplifier is aesthetic conditions. I've been playing guitar for 5 years, but I have very little experience with actual wiring amps, so if you could answer "from Zero would be greatly appreciated. Thank you! Take care.
Fender reverb circuit in every amp is similar http://www.geocities.com/princerev2/schematic.html very Before taking a look at the cables, etc off the amplifier, disconnect from the outlet and let sit for 15 minutes. valve circuits can accommodate a few electrical surprises for the unwary even after they are turned off. Take back and check the wiring to and from the reverb unit (This one silver box), since it is the most likely cause of the symptoms you describe. Also make sure that some clown has not started the reverb unit and is really present.
Harmonica Amps Vol.27 Fender-Clone Deluxe-Amp (2007)