Epiphone Electar Zephyr Schematic?

[Dr Phil]

Hi gang- I have one of those pre-war(?) Epi Electar Zephyr amps with the controls on top and the chassis in the bottom (Ser.#87XX). I understand that these may have been made by Nat Daniels. Does anyone have or know where I can get a schematic for this gem? Has anyone done any upgrades or mods to one of these? The tube complement is 3 each 6SJ7's up front, a pair of 6L6GA's and a 5V4 rectifier. I don't know if these are correct since there is no tube chart. It appears to be pretty much unmolested. In fact, it doesn't appear that there has ever been a repair done on it. It certainly doesn't have much power to be sporting two 6L6's, but this is primitive stuff here. I will appreciate any help! Thanks in advance! -Dr.Phil