VINTAGE NOS 807 TUBES

VINTAGE NOS 807 TUBES Introduction

FOR SALE: Lots of 807 tubes GE, MARCONI, RCA, WESTINGHOUSE The classic 807 beam tetrode valve is unusual in still being designated as current production in the 1960s and having a five pin base. The parameters given are for single ended use. When used in a class AB1 as a push pull pair with 600 volts on the anode an output power of 65 Watts was normal. These valves were much used in medium power amateur radio transmitters for high level modulation. In this use the output transformer, called a modulation transformer, would be impedance matched to the anode circuit of the RF power valve. The audio power would increase or decrease the amplitude of the RF envelope. The 807 was also a workhorse of the HF bands. As a transmitter power amplifier (shown in the lower table) operating in class C producing 40 Watts of RF, it would need a pair of 807's in push pull to generate the 20 Watts of audio required to fully modulate the valve. Other modulation systems operating on the screen grid would require much less audio drive but with less RF output. We also have 807 tubes with Bakelite and ceramic bases. Payable by e-transfers No Paypal Free shipping is available to anywhere in Canada on combined orders of $250.00 or more!