Sensibly equivalent¶ to:
The CV2799 is a double beam transmitting tetrode.
Following the European pattern, a central flat cathode is surrounded by a split control grid (one half per valve), a common screen grid is wound next. The two beam forming plates can be seen either side of the central assembly. The anodes are finned for good heat dissipation and clearly separated from the central structures, the anodes are brought out to pin like top caps.
The heater runs at 6.3 Volts when both halves are in parallel or 12.6 Volts when in series. For 6.3 volts pins 1 & 7 are connected together with pin 5 as the other end. For 12.6 Volt operation the voltage is connected to pins 1 & 7 with pin 5 left unconnected.
The side view shows the angled anode plates that have been carbonised for greater radiating efficiency.
In addition to use as transmitter power amplifiers the upper frequency of 600 MHz made them popular for frequency multiplication.
The wide glass tube envelope is 40 mm in diameter and, excluding the B7A base pins and top pins is 52 mm tall.
Absolute Maximum Operating Conditions¶
Updated December11, 2015. shape:wide.glass.tube construction:all.glass type:double.beam.tetrode age:1940.1950 base:b7a heater:6.3v pins:7 pin:1.h pin:2.g1(2) pin:3.g2 pin:4.k.bp pin:5.hct pin:6.g1 pin:7.h pin:tc.a pin:tc.a(2)