Radios A thru E

This is an Admiral AA6 tube 6T01-6A1 chassis in a wooden cabinet meant for an Admiral AA5 tube radio 6T04-5B1. The 6A1 chassis uses a variable inductor to tube the output of the RF stage, and a variable 2 gang capcator for the antenna circuit and the local oscillator.

Replaced the wax caps and the filter electrolytics in the 6A1 chassis before even powering it up. And found that a 12SH7 sharp cutoff tube works better than the 12SJ7 it calls for. Needed to retune the antenna cap trimmer a little. Just above is a closeup of how the variable inductor that tunes the output of the RF amplifier was done. A spring loaded arm rests against a cam attached to the tuning dial drum that also tunes the variable cap. The shape of this cam was designed to control the arm, which in turn moves the ferrite bar in and out of the coil. This shape was made to have the tuning of this coil track what the variable cap for the antenna circuit is tuning. It's possible, back in the day, Admiral couldn't obtain 3 gang tuning caps but still wanted to make a radio with an RF stage. And someone designed this workaround. Which actually works quite well.

Here I replaced the RF stage that was a 12SH7 with a 5899 submini tube, a semi-remote cutoff pentode. I stuck an 8 pin submini tube socket into the center hole of the octal socket, and wired the corresponding pin functions to the octal terminals below deck. The octal socket became a terminal strip. Works well. I added a shield around the tube, connected to one of the tube's cathode pins. And a center shield in the submini socket was also connected to ground, for more shielding the input from the output. I also did this with the IF stage. That stage ended up with too much gain, so I lowered it with a 100K resistor in parallel with the output LC of the 2nd IF transformer (plate to B+). These tubes each need only 6.3V in the heater string (current is 150ma) so I changed the 35L6 to a 50L6 (the two 6.3V submini tube heaters look like a single 12V, and thus the heater string looks like a typical AA5).

Right: an Admiral AA4

Australia: The AWA is quite similar to an AA5, except for the use of a power transformer. Internal loopstick antenna.

A transistor radio:

No, it's solid state:


Apex AD3201. This DVD player has a hidden menu.
To access:
Eject the tray, then press the numbers 8, 4, 2, then 1 on the remote. Dashes should appear on the screen for the first 3 numbers, then the hidden menu should then appear upon pressing the last number. Use the ^ and v keys on the remote to select "region" or "macrovision". Use "enter" to step thru which region you want (9 is "all" or "bypass") and if you want macrovision or not. Macrovision may make some vintage TVs or VCR channel modulators unhappy. To save the settings, close the disc tray. You can use the "Y" video output to feed a B&W TV set, as it will not have the color subcarrier on it.

Airline 83BR-502. No logo anywhere on this radio. Superheterodyne without an IF stage, 300ma heater string with ballast.

The Belmont transistor on the left is a typical superheterodyne set.

This Airline 62-508 radio is a superheterodyne with 150ma heater string tubes.

My brother and I had an Admiral B&W TV set just like this one (model 24R12) back in the '60's when we were kids. Diagram

An Admiral FM only radio

Not related to Firestone.

This radio has my name on it! model: 010

Not collectable yet! with 8 track

An Australian MW radio set, circa late 1960's: Calstan

Closeup of the above dial with Australian radio station callsigns:

A tube AM/FM stereo tuner someone glued a "Sony" logo over the "Claricon" logo.

The AM section is just like that of an AA5, but the FM is pertty good. I made the FM a little more sensitive by changing the last two FM IF tubes from 6AU6's to 6DE6's (twice the transconductance). Also did that to the AM IF (6BA6 to 6DE6). This was done after I did a first realignment, so I did really see improvement after a 2nd realignment.

A car radio (on the right) using 12V B+ space charge tubes.

Another, tag said it's for a 1960 Oldsmonile

This one is all transistorized. Note the conelrad D markings.

DeWald model A500 And a model C-800 AM-FM

My first stereo receiver, bought in 1972

this one in 1996

Vacuum tube stereo amp
Less hum in the phono preamp if the 12AX7s are replaced with 7025s.

This should be in the E section, but there's some leakage in this web site