"N_Cook" wrote in message
...
Mark Zacharias wrote in message
...
"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.
I tried to email you some data on that diode but it bounced. You can
email
me at
and reverse the domain to read "sbcglobal"
and I'll resend.
BTW I think the VN-900 was closer to 1970...
I own one, also a VN-700...
Mark Z.
Presumably about 1973 made, from www cites, although I can find no
indicator
inside the amp.
Can't find 6303 as an ELNA type number , so maybe old stock caps used.
Those 2SC960 with great bolt down mounting flanges, that are not bolted,
floating in mid air look mighty strange also , no package pic/type number
found for them, somewhere between TO3 and TO37 but flanges twice as thick
but TO5 size cap .
Amp serial number 046017**
As a teenager in the '70's I used to like these models, (the VN-900 and
VN-700) but now as a technician I find they are really kind of junky as
regards the amp section and overall quality, compared to the Pioneer,
Kenwood, Marantz etc of the time.
Seems like they put a little too much of the manufacturing cost into the SEA
tone section.
Also, I find one can clean the controls until you are blue in the face, yet
within a couple months they are acting up again. I seem to have much better
luck on this with other brands.
My VN-900 has low level noise problems I have so far been unable to resolve.
Coupling caps, power supply, signal transistors, no luck. Had to set it
aside for some future date...
Mark Z.