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38-3XX

38-3XX ; Philco, Philadelphia (ID = 501550) Radio
38-3XX ; Philco, Philadelphia (ID = 688080) Radio 38-3XX ; Philco, Philadelphia (ID = 50530) Radio
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38-3XX ; Philco, Philadelphia (ID = 688080) Radio
Philco, Philadelphia: 38-3XX [Radio] ID = 688080 466x716
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For model 38-3XX, Philco, Philadelphia Stg. Batt. Co.; USA:
Philco model 38-3XX. Image courtesy of Mark V. Stein for Radiomuseum.org use only
 
Country:  United States of America (USA)
Manufacturer / Brand:  Philco, Philadelphia Stg. Batt. Co.; USA
Year: 1937/1938 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 9: 6U7G 6A8G 6N7G 6K7G 6H6G 6Q7G 6F6G 6F6G 5Y4G
Main principle Superhet with RF-stage; ZF/IF 470 kHz
Wave bands Broadcast plus 2 Short Wave bands.
Details
Power type and voltage Alternating Current supply (AC) / 115 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: 38-3XX - Philco, Philadelphia Stg. Batt
Material Wooden case
Shape Console with any shape - in general
Notes Model 38-3XX has "Magnetic Tuning" (automatic frequency control) for eliminating drift and pulling stations to properly centered tuning. Export version had 230 VAC power.
Price in first year of sale 130.00 $
External source of data Ernst Erb
Source of data Collector's Guide to Antique Radios 4. Edition
Circuit diagram reference Rider's Perpetual, Volume 8 = 1937 and before
Mentioned in Philco Radio 1928-1942
Literature/Schematics (1) Pre-War Consoles


All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA
Here you find 3741 models, 2122 with images and 3137 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Philco, Philadelphia: 38-3XX
Threads: 1 | Posts: 3
Hits: 2006     Replies: 2
philco: 38-3XX
George Davis
09.Mar.12
  1

 Hello again, Another newbe question ; I have a 38-3 and a 38-4 Philco. I was wondering if the power transformers are interchangable. The 38-3 is 115v 50 -60 cycle,115-25cycle. the 38 -4 is 110-120v 50 to 60 cycle. 110 V to 120- 25 to 40 cycle, and 115 to 230  50-50 cycle   Thanks in advance George

Thomas Albrecht
10.Mar.12
  2

The power transformers for a 38-3 and a 38-4 should indeed be quite similar.  The 38-3 appears to have a slightly higher capacity power transformer, based on my observation that the high voltage secondary winding as a little lower resistance as indicated on the schematic.  That would make sense since the 38-3 has one more tube than the 38-4.  Even so, the difference is fairly minor.

Since the 38-3 transformer is a little higher capacity, it is fine to use it in either the 38-3 or 38-4.  Using a 38-4 transformer in a 38-3 might result in a transformer that runs a little hot, although it is well worth trying.  If it runs a bit hot, lowering the AC line voltage with a small bucking transformer can be a good solution.

Since these transformers were designed to run a several frequencies, and 60 Hz is the highest frequency they were designed for, most likely these transformers have some margin built in.  Operating at lower frequencies is generally more stressful on the transformer, so running with today's 60 Hz USA power, it should run cool.

Best regards,

Tom

George Davis
10.Mar.12
  3

Thanks again Tom. I am going to try it. Let you know  how it works. George

 
Philco, Philadelphia: 38-3XX
End of forum contributions about this model

  
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