Pye 817 Valve List

Early Electronic Television

Pye 817 Valve List

Television: Single channel TRF. The 817 originally had a Hivac T5M CRT. Our set came with a Emiscope 3/1 triode. Magnetic focus and deflection, approx. 45 degrees.

Function	Quan.	Type	Notes

Video RF amplifier	3	EF6
Video detector	2	EA50/T6D	Push-pull
Audio RF amplifier	2	EF6
Audio detector	1	EA50/T6D
Sync separator	1	EF6
Horizontal (line) oscillator	1	6J5	*
Horizontal (line) output	1	6V6	*
Vertical (frame) oscillator/output	1	6153T
Rectifier (HT)	1	UU5/IW3
High Voltage (EHT)	1	HVU1/HVR2	2500 VDC

*Factory (?) replacement for a Hivac AC/TZ, a triode-tetrode specially made for the set.

Factory service notes