An AM/FM prewar set, this one by Emerson.
Caution, screwheads on bottom of cabinet of the
578A are
directly connected to the powerline!
This FM tuner uses octal tubes! Model XFM-1
The GE model 1284A set above needed its
high voltage audio output transistor replaced. Used an NPN bipolar transistor
from the switching power supply of a junked monochrome monitor to
replace it, worked fine.
If you have a GE radio like this one
that is dead, check the output transistor.
I've had several with bad output transistors.
This GE C1580Z is the 1284A
with clock.
The homebrew set below uses GE circuit boards
almost identical
to those in the GE T1290A and T1290 sets above.
Here I installed a powerline
RFI filter behind the speaker
Radio now almost seems like a portable on batteries.
This homebrew set above uses a GE circuit board
almost identical to that in the GE T1290A. Right click "view image" to see the schematic, with my mods, full size.
These mods include a separate AM detector
using a base-collector strapped transistor for better weak signal demodulation, an
RFI filter
on the incoming powerline, and
changing a grounded (with respect to RF) base bipolar
transistor to a grounded gate JFET in the FM RF amp stage; this is to
improve the RF stage to have good strong signal performance, ie, better FM receive dynamic range, ie, a better intercept point. avoiding intermod products.
You'd want this if you live near New York City, with its crowded FM dial, right.
LW SW MW
Meissner 9-1047A tuner for the old 45MHz FM band.
This T601 has FM channel numbers, most don't.
RCA
A clock radio/TV
AM/FM stereo tuner
From Spain:
A European tube import
.. A Steelman 4AR12 console set, AM and phono:
This Truetone is virtually identical to my
brother's Lafayette set.
A nice tube radio with extra B+ on the audio output stage:
The H458T6 is just like this except brown trim instead
of black around the front. See below.
Using a 19HR6 tube in place of the
12BA6 in the IF amp stage improves the sensitivity of this set.
This radio
may be easily converted to 240VAC operation by removing the
powerline (mains) connection from the center of the
autotransformer to the top (rectifier plate). Leave the
heater string connected to the center tap.
See the diagram here.
This below Zenith had its selenium rectifier replaced by a silicon bridge. Details here.
Nice solid state hot chassis AM/FM with scrolling dial and 6 gang (3 AM, 3 FM) tuning cap: