154-0644-00
The Tektronix 154-0644-xx (P/N 154-0644-00,154-0644-04,154-0644-05,154-0644-09) is a CRT with distributed deflection plates for instruments specified up to 500 MHz. Suffix -05 has green P-31 phosphor, suffix -09 has blue P-11 phosphor.
A domed scan-expansion mesh between the deflection plate structure and the accelerating anode provides both isolation and a two-times deflection magnification.
Typical acceleration voltage is 24 kV (−3 kV on cathode, +21 kV on post-acceleration anode).
As used in the 7904, the 154-0644-05 CRT has a deflection factor of 3 V/div and an impedance of 385 Ω.
Håkan H. said:
There were four revisions of 154-0644-0x, -00, -04, -05 and -09.
Only -00 (<B040600) and -05 (replacement for -00 and used from B040600) were used in 7704A.
The other two were used by 7854 and 790x series opt 78 i.e P11 phosphor. For some reason 7704A opt 78 used another CRT.
If the CRT was replaced on 7704A below B221300, a Part Replacement kit (050-1732-01) was required. It contained the -05 CRT and two resistors (one for 7704A and one for 7904/R7903) used to reduce the heater voltage to extend CRT life.
Kit instructions here: Media:050-1732-01.pdf
