Home from work and digging the part numbers up for the various 10-turn
pots.
Mouser Electronics
958 North Main Street
Mansfield, TX 76063-4827
Voice: 800-346-6873 USA, Canada, and Puerto Rico
Voice: 817-483-5712 DX Countries es local
Fax: 817-483-0931
Email: sales@mouser.com
http://www.mouser.com
No minimum order in USA, Canada, and Mexico
Minimum Export order is $100 per shipment.
Specifications: 7/8" TEN TURN PRECISION WIREWOUND.
Power rating is 3.09 watts @ 40 C derated to zero watts @ 125 degrees C.
Tolerance: +/-5%
Linearity: +/-0.25%
Temp Coefficient: +/-20ppm/C degrees
Temp Range: -55 degree C to + 125 degrees C
In the cross-reference in the catalog the following are cross referenced
to the "Spectrol 534" which is what I'm using. There's also cross
references to "Bourns 3540" and "BI Technologies 7286 "series of pots.
Interesting, I also have a 50 ohm 10-turn but it's not listed in the
Mouser catalog.)
Stock No. (Metal Shafts)
594-53411102 1k $13.48
594-53411502 5k $13.48
594-53411103 10k $13.48
594-53411104 100k $17.08
These pots are also available with a plastic shaft $11.04, excluding the
100k pot which is $14.11.
Mouser also carries turns-counting dials for these.
Digi Key also has some pots, though a couple of dollars higher than
Mouser. They are Clarostats.
Installation in the 40a: I simply clipped the leads on the OE 10k
pot, then desoldered the remaining legs. These pots are wire-lead,
which means they won't give any support for the front panel. Without
the support the panel still seems plenty solid with the other
controls anchoring it. The pots outer shaft on mine was a tad too big
for the pre-drilled hole in the 40a. I used a cone-shaped grind-stone
on the end of a drill to grind slightly from both sides. Grind at a
slow/medium speed (wear eye protection) for short periods of time. Be
careful and take your time. Grind from both sides until you think the
hole is just about big enough....it doesn't take long so don't over do
it and end up making the hole overly big. Drilling from both sides has
produced a bevel on each side creating a raised edge on the inside of
the hole. Use a small file or whatever and grind this down smooth.
Sucker will slide right in without a lot of fuss.
Thought I'd pass this on, usual disclamers, not responsible for
errors<g>, no that isn't my dog, etc.,....
72/73
Ed Welch KF4KRV
NorCal Member #???
1st Grand Poobah ScQRPion of Alabama
QRP-L #873 - FISTS #2964
Luverne, Alabama
Crenshaw County - Grid EM61
+--------------------------------------------------+
----------+ Norcal 40a es Straight Key es Wire-wrapped Trees +----------
+--------------------------------------------------+
> Isn't "time" a 4-letter word? <
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