N_Cook wrote in message
...
In 1963 JVC VN900 amp, circuit designation STV-3, probably a triple diode
for bias seting, any info on it?. Parts listing absent from the manual,
just
68C on black body 4x7x10mm that looks like a slotted opto device but
instead
of square bottomed notch , semicircle curved, as though for locating on
a
rod, but mounted on pcb here.



Just found a side ref to it in the manual, a varistor, part number
E03094-002
circuit symbol 3 triangles in a row, like 3 diodes without 2 of the cathode
bars,
not skew Z over a resistor, or back to back triangles
Probably varistor diode but no useful data found yet , whether varistor or 3
diodes or varistor and 1 diode or whatever, or that symbol found elsewhere