[Hallicrafters] S38 restoration hits a snag, film at 11.

[Jim Tripp]

Hi Kirk,

You really should have a VTVM, or other high input impedance VOM meter
for working on radios.  When you measure the bias voltages on tube
socket pins it is important that the meter does not become part of the
circuit load, and therefore change the reading.  A high input
impedance voltmeter avoids this problem. 

There are a lot of good used VTVMs on the market. One popular one is
the RCA Senior Voltohmyst (spelling?). But you can find models made by
Eico, Heathkit, Knightkit, Simpson (maybe), and many others.  There
are probably modern VOM meters with FET inputs that accomplish the
same as a VTVM without the need to have an AC cord plugged in to the
wall someplace. But anything modern will most likely have a digital
readout and there is nothing like an analog readout for working on
radios. 

I love checking capacitors with the ohm meter scale. You can see the
meter deflect as the ohm meter battery charges the capacitor and then,
hopefully, end up at some high value of ohms. You can't see this
deflection movement on a digital meter.

Sorry I can't help you with a spare one, but check the flea markets,
ham fest, and that ever popular web based auction site. You can also
put out a "wanted" notice on Craigslist because that might turn up one
in your immediate area and you won't have to pay shipping.

If all else fails, go to the Dayton Hamvention in Dayton, OH on May
19-21. You will probably see 50 or more for sale there.
http://hamvention.org/


Jim/wa6dij

See my Hallicrafters radios at:
http://www.freewebs.com/wa6dij/hallicraftersradios.htm


-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Kirk Z
Bailey
Sent: Wednesday, March 29, 2006 11:40 AM
To: Hallicrafters at mailman.qth.net
Subject: [Hallicrafters] S38 restoration hits a snag, film at 11.

Now here's the beef;
My multimeter is a shiece of pit. (think about it...) I need to get a 
decent multimenter.

The radio is playing well, but has a bit of roughness to the audio. 
There may be some bad resistors in there way off value, with this
think 
I am GUESSING what the real value is. I may also want to replace 1 or 
more tubes to improve sound quality. Anyone got some helpful 
suggestions- AND A SPARE METER THEY CAN PART WITH which is worthy of 
depending on to trouble shoot a radio?


-- 
end
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