Yeah, those are old. In college in the 80's I had a Philips that I
picked up from the scrap heap and repaired it. They must have bought a
screw factory, it had so many screws. Partly transistorized but PL509
H-final, no PD500. It was a fairly compact unit but got quite hot.
Yes, in the 1980 - 1984 or so, I used to buy trade in sets like the K6, K9, etc,
refurbish those, and sell for a couple of hundred guilders.
Very 'green' too (hey an other first) ;-) ) 'recycling', except that the K6
drew several hundred Watt.
Then came the glorious idea of using SCRs and those could die like the
flies.
Some sets had SRCs in the deflection (2 turning each other off) Blaupunkt? Nordmende?,
not sure.
In one of those somebody did not do the math right, the transformers were wound with
litze wire to reduce losses, but got freaking hot anyways.
At some point I just didn't want to repair those anymore. Unless
someone dangled a crate of Grolsch in front of my nose ...
Those SCRs indeed was a common fault on those.
Sony had the KV1810 or something like that, it used silicon controlled switches.
Their soldering process sucked, and due to bad contacts the switches
would sometimes not switch off, both in supply and deflection, BOOM.
And smoke.
One TV was not like the other, clearly some manufacturers went to great trouble
to make a great set, and did, some models of some manufacturers were perhaps
made by the newcomers in the company.... And there was the cost factor too.
Philips with K12 did make a real good set, but it was too expensive (they told me),
the K40 was the other side, to be precise: the cheap side.
The K12 had black current stabilisation in the CRT driver, the K40 did have a lot of things NOT.
It all sort of worked though.
