The PL504 is a purpose designed television pentode line output valve. It was introduced as a replacement for the PL500.

The peak anode voltage is quoted as 7,000 Volts and shows why the line output stage of a television receiver was the last consumer electronics product to remain a valve. The CRT excepted of course.

TV line output valves found their way into amateur radio transmitters for service at HF (up to 30 MHz) because of their peak voltage characteristics and relatively high current capability.

The wide glass tube envelope is 28 mm in diameter, and excluding the B9D base pins, is 89 mm tall.

 
Pin Connections

B9D	1	2	3	4	5	6	7	8	9	tc
	g1	g1	k,g3	h	h	g2	g2	k,g3	k	a

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	mAa	mAs
	27	0.3	75	200	440	30

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 08 June 2007