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 acknowledged.
What drew my
attention with this
P.R. Mallory & Company advertisement was not an actual electronic component that they are
most noted for - potentiometers, capacitors, switches, metal alloys, and of course batteries (later
renamed Duracell). Philip Rogers
Mallory began his company manufacturing tungsten wire for lamps. Rather what interested me was the huge
variety of standard potentiometer and rotary switch extension shafts. 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. 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 February 23, 2016