68C diode from 1963 [Repair]

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From: N_Cook on 25 Jan 2010 03:17

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.

From: N_Cook on 25 Jan 2010 04:47

N_Cook <diverse(a)tcp.co.uk> wrote in message
news:hjjk1l$64m$1(a)news.eternal-september.org...
> 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

From: Mark Zacharias on 25 Jan 2010 05:49

"N_Cook" <diverse(a)tcp.co.uk> wrote in message
news:hjjk1l$64m$1(a)news.eternal-september.org...
> 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

mark_zacharias(a)labolgcbs.net

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.

From: N_Cook on 25 Jan 2010 10:16

From: N_Cook on 25 Jan 2010 10:50

Mark Zacharias <mark_zacharias(a)sbclobal.net> wrote in message
news:00cec390$0$8066$c3e8da3(a)news.astraweb.com...
> "N_Cook" <diverse(a)tcp.co.uk> wrote in message
> news:hjjk1l$64m$1(a)news.eternal-september.org...
> > 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
>
> mark_zacharias(a)labolgcbs.net
>
> 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.
>

I was taking 6303 on the Elno main caps as datecode , dark brown phenolic
pcb board, wire-wrap type wiring and some strange transistor packagings as
being consistent with 1963 but will burrow again

Not that 150A package but
Imax 120mA, Vr max 50V, Ir max 10uA, and at 7mA, 1.65V forward V, -7mV per
degree C

As one 1n4148 is about -1.6mV per deg C then 3 in series would be about
right forward V but not enough thermal response at -4.8mV , is Ge more
thermally responsive ? or some sort of NTC thermistor in there as well

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