[sdiy] Question: Vactrol equivalent part numbers

[JH.]

> My Korg PS-3100 has some LDRs in it - three are "HTVP873D" and another
three
> are "HTVP873-G35-201B" and I want to buy some spares.
>
> The first type contains two LDRs with a common terminal, the second type
is
> a standard single LDR.  I have searched and visited several websites but,
> short of demounting the LDRs and measuring them, I don't know their
> characteristics and can't see what equivalents there might be. the Perkin
> Elmer site didn't throw up any equivalents.
>
> Does anyone know these devices, or can anyone tell me model numbers for
some
> similar ones?

These are made by Hamamatsu, and AFAIK you can still get them. Not cheap,
though. Try google - it's been a long time since I got mine.

JH.