Digest for sci.electronics.repair@googlegroups.com - 3 updates in 2 topics

9:44 AM Penedão
oldschool@tubes.com: Aug 23 12:46AM -0500

On Wed, 22 Aug 2018 12:54:50 -0400, Ralph Mowery
>rg 8x cable without degrading the audio. It is only for communications
>quality speech.
 
>I know all about RF type cable, but have not ventured into the audio.
 
You can buy a cheap 6 foot guitar cable on ebay for under $5. Cut off
the 1/4" jacks and install your own connectors. A local music store may
even have an old used guitar cord and sell it real cheap.
Ralph Mowery <rmowery28146@earthlink.net>: Aug 23 10:11AM -0400

In article <cbisnd5br3n4a2tntg8s7n1v9uffqr28fv@4ax.com>,
oldschool@tubes.com says...
 
> You can buy a cheap 6 foot guitar cable on ebay for under $5. Cut off
> the 1/4" jacks and install your own connectors. A local music store may
> even have an old used guitar cord and sell it real cheap.
 
That is just about what I did. I got on ebay and bought a 50 foot cord
for about $ 12 and plan on cutting off the ends. I will see how that
works out when it comes in in a few days.
 
I thought I had some rg58 with the stranded center, but could not find
any. Could not use the 8x as found out it was too large to fit the
hole. I have some of the rg 142 think that is it, double shieled
silver plated size as 58) but did not want to use that cable at a couple
of bucks per foot and is sort of stiff.
"Ron D." <ron.dozier@gmail.com>: Aug 22 02:42PM -0700

I figured I have to back my statement up:
 
from: PDF page #1: https://www.desmith.net/NMdS/Electronics/Hickok/Hickok%20539C%20Calibration%20V4.1.pdf
 
 
Use this procedure to test and calibrate the Hickok
Model 539C mutual conductance (AKA
transconductance) tube tester. Except as noted, all
of the readings are taken with a 1000 ohms per vol
t
meter. If an accurate 1000 ohms per volt meter is n
ot available a modern high impedance analog or
digital voltmeter can be used with appropriate shun
t resistors in parallel with the input to simulate
proper loading. The following resistor values shoul
d be used: 10 volt scale use 10K, 50 volt scale use
51K,
250 volt scale use 250K. All resistors are 1/2 watt
5% carbon composition. Calibration will be easier
if
you supply AC power through a constant voltage regu
lation type transformer to do the tests, but this i
s
not essential. Recalibrate the tester any time eith
er rectifier tube is replaced. The correct type #81
(#63
for 230VAC mains) fuse lamp must be installed in th
e tester or false readings can result.
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