[Test-Equipment] HP 200 CD

[Eric Lemmon]

You can download a very good copy of the 200CD manual at this site:
<http://bama.edebris.com/manuals/hp/200cd/>

Choose the "200cd_cleaned" version- it's very good.  You will find the
component values in the parts list.  The 5AR4 rectifier can be replaced with
a 5Y3GT tube.  You can't replace a tube rectifier with silicon diodes unless
you compensate for the greatly-reduced forward voltage drop of the latter,
and that can be problematic.  I suggest that you stick with the original
parts.

73, Eric Lemmon WB6FLY
 

-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of kf9nz at juno.com
Sent: Saturday, January 31, 2009 12:01 PM
To: test-equipment at mailman.qth.net
Subject: [Test-Equipment] HP 200 CD

        A 200CD followed me home recently after being abandoned.  It
lights up and does produce tone, although I only had it on for a few
seconds to see if there was any smoke leaking out.   Can anyone tell me
the value of the three electrolytic caps C12-C13-C14 in the P.S.?    
Also, what is a 5AR4 tube?  Obviously a rectifier, but I have never heard
of it.  Is there any common type replacement?    I suppose a couple of
silicon diodes would do the job if the 5AR4 quit anyhow, but I'd just
like to know. 

Frankf9nz