national valco amp

[pontiacpete]

Anyone familiar with this amp. THe tube line up is 5y3, 2-6v6s, and 6sc7 and a 6sq7. The 6sq7 had been changed to a 12ax7.
Is there a schematic for this amp?
It probably had a field coil speaker. It now has 2 - 8" speakers and most likely a different output transformer, parallel.

Got it working but it has a noise , like a ticking oscillating sound in the backround.
here's some pics:

[sgunn]

there's a schematic at valcopages

[pontiacpete]

thanks , I ended up using a schematic that Terry sent me. Very helpful. thanks