Old Radios .
Here are some old AA5 AM tube radios, and a few solid state ones.
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Most of these sets are pretty common.
Click here to see two AA5 schematic diagrams,
a history of the AA5 radio, the "UL" knot -
. Radios A-D,
Radios G .
H thru K .
Radios LMN .
Radios OP .
Radios T thru Z .
By type:. Bakelites .
Plastic tube sets.
Solid state sets 70s ,
80s & 90s, 2000s.
FM only radios -
45 MHz FM b'cast sets - TVs - Radios in 3-D! - Radio station
jingles - Radio index .
Click here for
Fonts, and for chassis pictures, and here for radio pictures from the 1936 Acratone catalog.
Align an AA5 radio without
Identify outside foil on
modern capacitors. AA5 Repair tips.
Radios in movie _Dr Strangelove_.
A study of radio dials.
Radios for foreign countries
(ie, non USA). Deco and Moderne Radios IMHO, YMMV. Other Equipment
AA5 radio modifications:
Circuit mods to do in ordinary boring AA5 AM radios. The ones you see for cheap in junk boxes at
fleamarkets. Scuffed up but complete sets.
-Using a 12BA7 pentagrid
converter in place of a
12BE6 or 12SA7 in AM tube radios. 6dB more signal gain.
-And more IF gain by replacing the 12BA6 with
Replace the 12SA7 with a 6SB7Y in an AA5, twice the
-"K-tran" IF transformer
tweaking for a little more gain.
for more signal capture from the air.
-Using car radio tubes in an AA5.
-Using a dual control pentode such as the 6AS6/5725 in the IF of an AA5 radio.
-An AA5 modified to be a double conversion SW set (5.5 to 16 MHz)
-Negative feedback in AA5 audio amps
-Infinite impedance AM detector in an AA5
-High fidelity AM detector (mods for better modulation acceptance)
-Wideband AM IF filter for 10KHz of AM radio station audio reception
-Three AM tube radios using
and one using
compactrons. Another using both.
AA5 AM tube radio designs to run on
240V AC, four methods (a "what if" study).
-To run an AA5 on 100VAC (Japan), replace
the 50C5 with a 35C5 or 30A5, or if it's a 50L6, use a 35L6.
Optional: install second 1K resistor in parallel with the resistor
connected between rectifier output B+ and the output tube screen/
B+ for rest of set. That is, between the two sections of the
- Explanation of humbucking via a tap on the output transformer used in some AA5s, just above here
- Small micropower AM transmitters to build: tube, or
Modifying older digitally tuned AM receivers to get the extended AM band.
Example shown is the AKAI AAR32
It's sometimes fun to use HP and Tektronix tubes in TVs and radios.
My father built this years ago
for the stereo equipment in the living room. The B&W photo shows part of it in the upper left corner, as it was in 1960.
Sketchy woodworking plans of
this furniture style electronics rack, for rack mount equipment.
Improve the SAF (spouse acceptance factor) of your equipment!
Two schematic diagrams of the typical "AA5" AM tube radio:
knot is symmetrical: .
You name it, the Catholic Church had a patron saint for it.
If you are from a 240V AC country, and just moved to America, see
if your apartment or house has an outlet like this. 240V at 15 amps (NEMA 6-15).
for large air conditioners.
But not the electric dryer or range outlets,
those are too much amperage and if your equipment ever
shorts out could cause a fire. If your old
equipment designed for 240VAC doesn't mind 60Hz (most stereos
and non-clock radios will be fine on 60HZ, but turntables
probably will play too fast), you could use this outlet, or have one
installed in your house or condo. You'll need to modify an outlet strip
you bought in your home country by changing its plug to match the
American 240V outlet. Be aware that both sides of the mains in this
plug will be "hot". That shouldn't be an issue in well
designed equipment, as many European plugs fit in many European sockets either
way. Like the Italian 10A and 16A plugs, Schuko general use 16A (the ones with ground
contacts on the sides, not the "pin in the socket that sticks into the plug" type),
and 2 pin Euro plugs.
That makes both power wires on a radio's power cord potentially hot in
And a few Australian style American outlets made by Hubbell in the late 40's,
here, in my house, feeding 240V 60Hz to an Australian
Calstan radio, and this
Philco from New Zealand. And some pictures
I took during a vacation in Australia in April 1986 🌏
I also taped some Aussie radio airchecks
during my trip
Links to other sites on the Web
My other web page:
sub-miniature tube info,
Old Electric Clocks pictures,
* Modified AM radios with
* Astro art pictures
Extensive list of radio web pages
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Ham radio page
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