February 1947 Radio News
[Table of Contents]
Wax nostalgic about and learn from the history of early
electronics. See articles from
Radio & Television News, published 1919-1959. All copyrights hereby
What drew my attention with this
P.R. Mallory &
Company advertisement appearing in a 1947 issue of Radio News
magazine was not one of the actual electronic components for which they are most
noted - potentiometers, capacitors, switches, metal alloys, and of course batteries
(later renamed Duracell). Rather
what interested me was the huge variety of standard potentiometer and rotary switch
extension shafts Mallory manufactured. Unlike modern electronics where pots and switches are typically
mounted to the enclosure with wires running to the circuit assembly, many older
radios and televisions had all components mounted on a metal chassis with control
extensions reaching to front-panel mounted dials and knobs. As an aside, Philip
Rogers Mallory began his company manufacturing tungsten wire for lamps. Believe it or not, people
are selling these vintage advertisements on
eBay; well, at least they're trying to sell them.
Mallory Offers 12 Clutch Type Controls for use in Auto Receivers
Mallory offers the widest range of resistance values in clutch type controls
to fit every need. Four different values are available in the Universal Midget line
(100M ohms, 250M ohms, 500M ohms, 1 megohm), and eight values in popular combinations
of overall and tap resistances in our Tapped Midget line.
Add these to the Plug-In Shafts you see at the right, and you can replace original
controls in any auto set you name - not merely replace them but duplicate them mechanically
and electrically. Get the complete story from your Mallory distributor.
You Expect More ...
and Get More ...
No Wobble - this ring prevents it!
All Mallory Plug-In Shafts are made with a small ring as shown above. That's
why they can't wobble or work loose - why they fit as securely as a fixed shaft.
Insist on Mallory - the Complete Control Line
P.R. Mallory & Co., Inc.
Vibrators ... Vibrapacks* ... Capacitors .. Volume Controls .. Switches .. Resistors
.. Filters ... Rectifiers ... Power Supplies.
* Reg. U.S. Patent Off.
Approved Precision Products
P.R. Mallory & Co., Inc., Indianapolis 6, Indiana
Posted July 20, 2022
(updated from original post on 2/23/2016)