The 1624-RCA is a transmitting tube very much like the well-known 807, the major difference being a direct- heated filament, 2 volts- 2,5 amperes.
Connected as a pseudotriode (screen to the plate, by means of a resistor) it is a good performer for a SE amplifier.
In fact this tube has a number of advantages compared to other tubes of similar poweroutput:
-RCA: NOS-quality terms- stands for rigid construction, reliability, good sound, nice look.
-DIRECT-HEATED sound, more like a 2A3 than an 807
-better and cheaper than many triodes of todays current productions.
-EASY to drive, unlike other triodes (eg. 2A3, 300B)
no high voltage swing is required; in my amp cathode bias is -23 Volt. It is possible to use a good quality low µ-tube as a driver, such as the 6SN7. No problems with slew-rate either, since the anode current of the driver is about 3mA!
for CONSTRUCTION DETAILS of the 2x1624SE
go to the next page
Uf = 2, 5 Volt
If = 2 ampere
Ua = 600 Volt
Ia = 50 mA