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.
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.
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
this one in 1996
This should be in the E section, but there's some leakage in this web site