Except for the AM/FM set, all these below Emerson tube
radios use the same circuit board. This board has the IF
tube input biased to ground instead of the AVC line. Thus there
is no point in using a remote cutoff pentode (12BA6) for the IF
stage as its gain is not varied. So I replaced the 12BA6s with
some 12AU6s (sharp cutoff pentode) I had many of. This reduces
"modulation rise" distortion products in the amplified signal.
See the sub-miniature tube AM radio modification page for this radio on the right.
Original tubes in this set datecoded 65-17