Philco Model 91D (91) Console Radio (1933)
This beautiful model 91D highboy (where the D stands for "with doors") was introduced in the early summer of 1933. It uses
the later two-band version of the 9-tube model 91 chassis. The early, single-band version of the chassis was introduced the
previous summer as one of the first Philcos to adopt the newly introduced 6 volt tubes. The radio tunes the standard broad-
cast band from 520 -1500kc and the police/aircraft band from 1.6 - 3.2mc. It provides a tuned RF stage, automatic-volume-
control (AVC), a bass-compensating 4-point tone control, a shadow meter for precise tuning and a push-pull output stage
using type 42 pentodes (wired as pentodes, not triodes as would be the case in later Philcos). This model employs the code
126 chassis that drives a single loudspeaker (the 91X of the same model year employed the non-interchangeable dual-
speaker code 226 chassis). The original purchase price of the 91D was $85.
The complete tube line-up is 44 (RF amp), 36 (LO/mixer), 44 (IF), 37 (2nd detector diode-connected triode), 37 (det amp),
37 (audio driver), 42 * 2 (push-pull outputs), 80 (rectifier). The driver is transformer-coupled to the output stage. The
schematic is available here, courtesy of NostalgiaAir.
The 91 series was a follow-on to the model 90 line that ran until the spring of the previous year. I purchased this radio from
an antiques store in restored condition, exactly as photographed. It is a tall radio, standing almost 48" high!
the later two-band version of the 9-tube model 91 chassis. The early, single-band version of the chassis was introduced the
previous summer as one of the first Philcos to adopt the newly introduced 6 volt tubes. The radio tunes the standard broad-
cast band from 520 -1500kc and the police/aircraft band from 1.6 - 3.2mc. It provides a tuned RF stage, automatic-volume-
control (AVC), a bass-compensating 4-point tone control, a shadow meter for precise tuning and a push-pull output stage
using type 42 pentodes (wired as pentodes, not triodes as would be the case in later Philcos). This model employs the code
126 chassis that drives a single loudspeaker (the 91X of the same model year employed the non-interchangeable dual-
speaker code 226 chassis). The original purchase price of the 91D was $85.
The complete tube line-up is 44 (RF amp), 36 (LO/mixer), 44 (IF), 37 (2nd detector diode-connected triode), 37 (det amp),
37 (audio driver), 42 * 2 (push-pull outputs), 80 (rectifier). The driver is transformer-coupled to the output stage. The
schematic is available here, courtesy of NostalgiaAir.
The 91 series was a follow-on to the model 90 line that ran until the spring of the previous year. I purchased this radio from
an antiques store in restored condition, exactly as photographed. It is a tall radio, standing almost 48" high!
Philco 91D.. a 6-leg Highboy cabinet with Doors.
"Philco 91D...6-leg
Highboy cabinet with
doors, supreme tone
quality, bass
compensating tone
control, shadow tuning,
automatic volume
control, floating
chassis, oversize
speaker and other
Philco improvements"
Highboy cabinet with
doors, supreme tone
quality, bass
compensating tone
control, shadow tuning,
automatic volume
control, floating
chassis, oversize
speaker and other
Philco improvements"
A Child can tune with Philco Shadow Tuning...
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