[rfeenstra]

Good point on the heater current. The schematic also lists a 5V4 which has a slightly higher capacity, still 2 amps heater current. The 5V4 and the 5Z4 are cathode rectifiers rather than filament. Don't know if that makes much difference other than slightly slower in supplying current to the filter sections which is 32mfd at 600v (2 x 16mfd in parallel).