[Collins] 30S1

[Dr. Gerald N. Johnson]

On Sun, 2007-04-15 at 13:28 -0400, J D Delancy wrote:
> Jerry
> 
> Thanks.  I'm not sure we're talking about the same diodes though.  The one's 
> I think are CR206 are bullet like shaped, clip into holder that looks like a 
> buss fuse holder and about two inches from the front panel of the shelf
> 
>   jd
> 
In my yellow book schematic there is only ONE CR206. Its listed as
1N1081. There is a second 1N1081, CR209. That picture I sent is of the
shelf with the 12AL5 and the diodes that I see as selenium are behind
the 12AL5. The clip in diodes would have been appropriate 1958 or so
replacements for the selenium. Though some 1N108x family were silicon
top hat shaped rectifiers with wire leads. At least the versions used in
the pictures in my 75S-3B book. This picture could have been an early
pair of seleniums on the bias rectifier.

Maybe you can compare the wire colors if that's the right area in the
picture. Otherwise notice that the "fuse" clips have inner edges on the
clips on one end which only accepts the diodes (because they have a
groove on only one end) in one way.

OK, I've dug the reference collection. Catalogs showed those were
Sarkes-Tarzian diodes. 1N1081 100 volts 1 amp, 1N1084, 400 volts 1 amp.
I had to find my original Sarkes-Tarzian data sheets to identify the
diode ends. The end with the groove is the cathode end. Look for the
groove acceptance wings on the clips.

They probably will be both turned the same direction even though they 
aren't in the same circuit.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer