[sdiy] RE: Countryman phase shifter component ID needed

[Larry Spence]

Several people have emailed me suggesting the little white chips might be
Vactrols.  I don't think so, partly because they're too small (about 1 mm
thick), and because it would mean there are nine Vactrols and only one op
amp, which would be an unusual design to say the least.

I mananged to get Carl Countryman's email address, so I've emailed him and
will hopefully get some details from the man himself.

Larry

-----Original Message-----
From: >>>marjan<<< [mailto:urekar.m at EUnet.yu]
Sent: Wednesday, May 09, 2001 5:21 PM
To: Larry Spence
Cc: synth-diy at node12b53.a2000.nl; analogue at hyperreal.org
Subject: Re: [sdiy] Countryman phase shifter component ID needed


> There's a key component that I don't recognize.  It's a little white chip,
> about 1 cm on a side and only 1 mm or so thick.  It's got ten copper
leads,
> four of which have been snipped off flush with the chip.  Markings are an
H
> logo (Harris?), A9, 911-5.  There are a total of nine of these "chips"
(they
> don't look like normal ICs) on the main board.  The only other visible
> active component is an old-style op amp.  Can anyone ID the white chips?
> Primitive delay lines?  Op amps?

Vactrols (LDR+LED pair)? Often used in phase shifters...
Maybe just LDR but then it should have LED or a bulb somewhere...


marjan