Quote:
Originally Posted by old_tv_nut
What sort of high voltage rectifier was used, do you know? When I joined Motorola in 1966 they were working on the solid state chassis (I wasn't directly involved), and they used a single solid state rectifier assembly that consisted of a stack of several hundred "high" voltage rated diodes (perhaps 1kv each). The asembly had curved side fins to equalize the capacitive current among the diodes from the top to the bottom of the stack. The units were made by Varo in Texas.
I don't know how long Motorola used tube rectifiers, but my impression is that it was just a stopgap while the solid state rectifiers were being perfected.
|
Off hand I have no idea, and I will have to get the service manuals out of storage. The Christmas holiday has become rather extended in the UK and for most non-retail operations extend thru to the 3rd January! That includes my storage facility.
I spent an hour or two reading through my dads Journals this morning and I am learning some interesting things about some interesting Anglo/USA connections. In 1955 Thorn and Sylvania set up a CRT plant in the UK, in 1956 they formed the Sylvania Thorn colour TV labs here. and before 1967 Thorn were importing the Glass CRT bulbs from the USA for the original run of CTV tubes and building them here. Dad also mentions co-operation between Thorn and RCA in the mid 60s (have not found out what for as yet).
Those Line output / EHT state of the art transistors were Texas R2009.
No round tube CTVs were ever marketed in the UK as by 1967 rectangular tubes were the norm here, BUT dad did say that it is possible that some rebranded USA round tube sets were actually imported, modified for PAL UHF 625 line 240 volt 50 hz.. and put on the rental market?