[R-390] test equipment question

[Craig C. Heaton]

Steve,

 

What is on your test bench now will get the job done. Add a 600 ohm resistor
to hang on the speaker terminals to check the signal +noise to noise ratio.

 

I never needed more than the items you have already listed. Other pieces of
test equipment might make trouble shooting faster, but will those failures
occur? Not to restart the capacitor, beat the dead horse discussion, a cap
analyzer that test caps at rated voltage is nice, but one could save the
money to purchase said item, just buy the caps and replace BBOD's etc.,
before plugging the receiver into a wall outlet.

 

Craig,

 

From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Steve Toth
Sent: Friday, February 13, 2009 12:28 AM
To: r-390 at mailman.qth.net
Subject: [R-390] test equipment question

 


Some questions for the veteran radio techs - I'm organizing to start work on
a couple of R-390A's I just acquired.  What test equipment do I need (as
opposed to "would like to have") to get these babies running??

 

What I have now:

 

TV-7/U tube checker and spare tubes

AN/URM-25D signal Generator

Heathkit VTVM

Digital VOM

Digital Dial / Direct Freq Meter good to 50Mhz

 

Looking at the Y2K manual, pg. 1-12 and looking thru the stage-by-stage
troubleshooting steps in Section 5, three other items are mentioned:

 

1.) RF Multimeter - can I use an adapter with the VTVM or VOM?  How?

2.) Audio Oscillator that covers 425-3500hz @ 100mv

3.) Oscilloscope that can cover .2 to 2vdc/cm

 

If I do need'em what inexpensive models should I look for at ham flea
markets (got a big one coming up in the Northwest), places like Fair Radio,
on Craigslist and (last preference)Epay?

 

Thanks.

 

-- Steve 

Woodinville, WA

If you can read this, thank a teacher; if you're reading this in English,
thank a military veteran.

 

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