Philco Model 47-1227 Radio and Phonograph Console (1947)
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The Philco 47-1227 is a very solid performing 9-tube radio-phonograph providing coverage of both the standard
broadcast (540-1720kc) and modern FM (88-108mc) bands. It has excellent sensitivity and selectivity, owing to the
use of double IF stages plus, for the FM band, a high gain pentode RF amplifier. The set uses a 12" electrodynamic
speaker mounted to the front-panel that tilts out to reveal the internal phonograph. Negative feedback is applied from
the secondary of the output transformer through to the input of the af stage, providing improved frequency response
and reduced harmonic distortion. This model was introduced in 1947 with an initial sales price of $239.50.
The 47-1227's tube line-up is 6K6GT*2 (push-pull power amp), 6AG5 (FM rf amp), 7F8 (converter/osc), 6BA6 (1st IF),
7R7 (2nd IF, AM det, AVC det), 7X7 (ratio detector, 1st AF), 6J5GT (phase inverter), 5AZ4 rectifier. Interestingly, this
radio does not use Philco's notorious FM1000 discriminator, which was a forerunner of today's PLL discriminators for
FM. Instead it uses a ratio detector based upon the dual diode section of the 7X7 tube. There is no AFC on the radio
and drift is a problem on the FM band while it is warming up.
Of all the radios we have in our home, this is one of the best performing (at least on BC) and it sits in our great room
and gets played very often while we're eating dinner. It sounds just great tuned to WJIB (on BC) out of Cambridge
(about 15 miles away), even after dusk when they shut the radiated power down to 5W! Some of my other radios will
barely pick it up then.
I found this set at a yard sale and when I tested it out I could hear static but it would not tune in any stations. It turned
out the screen-grid decoupling capacitor for the 6BA6 1st IF tube was shorted to ground. After this diagnosis I gave it
a complete re-cap, though it wasn't the easiest chassis I've ever worked on owing to its use of a sub-chassis that's
very cramped. The phono does work but it needs a replacement cartridge.
broadcast (540-1720kc) and modern FM (88-108mc) bands. It has excellent sensitivity and selectivity, owing to the
use of double IF stages plus, for the FM band, a high gain pentode RF amplifier. The set uses a 12" electrodynamic
speaker mounted to the front-panel that tilts out to reveal the internal phonograph. Negative feedback is applied from
the secondary of the output transformer through to the input of the af stage, providing improved frequency response
and reduced harmonic distortion. This model was introduced in 1947 with an initial sales price of $239.50.
The 47-1227's tube line-up is 6K6GT*2 (push-pull power amp), 6AG5 (FM rf amp), 7F8 (converter/osc), 6BA6 (1st IF),
7R7 (2nd IF, AM det, AVC det), 7X7 (ratio detector, 1st AF), 6J5GT (phase inverter), 5AZ4 rectifier. Interestingly, this
radio does not use Philco's notorious FM1000 discriminator, which was a forerunner of today's PLL discriminators for
FM. Instead it uses a ratio detector based upon the dual diode section of the 7X7 tube. There is no AFC on the radio
and drift is a problem on the FM band while it is warming up.
Of all the radios we have in our home, this is one of the best performing (at least on BC) and it sits in our great room
and gets played very often while we're eating dinner. It sounds just great tuned to WJIB (on BC) out of Cambridge
(about 15 miles away), even after dusk when they shut the radiated power down to 5W! Some of my other radios will
barely pick it up then.
I found this set at a yard sale and when I tested it out I could hear static but it would not tune in any stations. It turned
out the screen-grid decoupling capacitor for the 6BA6 1st IF tube was shorted to ground. After this diagnosis I gave it
a complete re-cap, though it wasn't the easiest chassis I've ever worked on owing to its use of a sub-chassis that's
very cramped. The phono does work but it needs a replacement cartridge.
...brings you static free FM broadcasts and standard programs.
Automatic record changer plays up to 12 records.
Permanent needle lasts for thousands of plays!
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