Best transistor cross reference?

[zeno]

The trouble makers are the hoz output. Its called a gate controlled switch.
They are marked SG-### and are on a heat sink on the HV board.
It takes nothing to blow one & some other parts. Finding the actual
cause is sometimes imposable. When I was at Sony service they would
often change the whole HV board to get one right. That was the mid 70's
and almost nobody would touch one. Those that did charged $125 + parts
sometimes the bill went over $200, a lot back then. My 76 Coupe DeVille
was only about $8000 new IIRC ! And that was a REAL Caddy

On your 2SC1127 you should be OK BUT on older sets you did have to use
the OEM or the color didnt look right. They even had a bulletin on it.
Cross that bridge if you come to it.

73 Zeno
LFOD !

[AlanInSitges]

Originally Posted by zeno

The trouble makers are the hoz output. Its called a gate controlled switch.
They are marked SG-### and are on a heat sink on the HV board.
It takes nothing to blow one & some other parts. Finding the actual
cause is sometimes imposable. When I was at Sony service they would
often change the whole HV board to get one right. That was the mid 70's
and almost nobody would touch one. Those that did charged $125 + parts
sometimes the bill went over $200, a lot back then.

73 Zeno
LFOD !

A while back Shango had one of these that kept eating all of the semiconductors in the HO section. After lots of back and forth he tracked it down to a broken - what do you call it, wire? bracket? clamp? - through the flyback core. I can't remember the whole reason this caused it to happen; it was a really complicated circuit.

[zeno]

Watched that & communicated with him. It was a broken U-bolt on the FBT.
Holds the ferrite core halves together. Without it the resonant freq goes off
& you would see garbage on the drain of the SG. Normal wave form would be one big clean spike. Normal transistors in Hoz out can also instant destruct &
sometimes cause a chain reaction BUT most the time there are easy ways to
fix them. The real bad ones were the 17" sets with the controls along the bottom. At the time they were the BEST you could get. The first runs had TWO SG-613's one for hoz out & one in the power supply. A nightmare.
So to Shangos set. Cost was the big thing In the day SG-613 = $25,
OEM damper $8, OEM 2SC867 $12. Add a C-note for labor. A few weeks
later the customer hears a click & everything is blown again. You
have to eat the SG613 as Sony WILL NOT warranty them ( along with
video heads, some clocks & other things).

Nuff fer now, always a pleasure Alan.
LFOD !

Originally Posted by AlanInSitges

A while back Shango had one of these that kept eating all of the semiconductors in the HO section. After lots of back and forth he tracked it down to a broken - what do you call it, wire? bracket? clamp? - through the flyback core. I can't remember the whole reason this caused it to happen; it was a really complicated circuit.