[Test-Equipment] HP 200 CD - UPDATED

[kf9nz at juno.com]

      Thanks to all for the info.  I guess I should have Googled "200CD"
before I bothered all of you.   Mine must be a very late version since it
uses miniature tubes instead of the metal octal base ones shown in the
manual I just looked at.  I carried one of these boys around a lot back
in the '60's, but never opened up the case until I got this one.  They
never failed.   Too bad hp exists in name only today.

Frankf9nz   


On Sat, 31 Jan 2009 12:51:36 -0800 "Eric Lemmon" <wb6fly at verizon.net>
writes:
> I compared both HP200CD manuals on the BAMA site with their tables 
> of
> contents, and found that Section IV page 13 is missing, and page 12 
> is
> included twice.  Page 13 is the troubleshooting chart.
> 
> 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 Eric 
> Lemmon
> Sent: Saturday, January 31, 2009 12:24 PM
> To: 'Discussion of Electronic Test Equipment'
> Subject: Re: [Test-Equipment] HP 200 CD
> 
> 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
> 
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