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TE-38 Duet

TE-38 Duet ; Sonora Radio & Telev (ID = 62032) R-Player
 
TE-38 Duet ; Sonora Radio & Telev (ID = 626832) R-Player
 
TE-38 Duet ; Sonora Radio & Telev (ID = 626833) R-Player
 
TE-38 Duet ; Sonora Radio & Telev (ID = 626834) R-Player
TE-38 Duet ; Sonora Radio & Telev (ID = 513621) R-Player TE-38 Duet ; Sonora Radio & Telev (ID = 513582) R-Player
TE-38 Duet ; Sonora Radio & Telev (ID = 513615) R-Player TE-38 Duet ; Sonora Radio & Telev (ID = 513580) R-Player
TE-38 Duet ; Sonora Radio & Telev (ID = 513588) R-Player TE-38 Duet ; Sonora Radio & Telev (ID = 513598) R-Player
TE-38 Duet ; Sonora Radio & Telev (ID = 513606) R-Player TE-38 Duet ; Sonora Radio & Telev (ID = 513611) R-Player
TE-38 Duet ; Sonora Radio & Telev (ID = 1667654) R-Player TE-38 Duet ; Sonora Radio & Telev (ID = 1667655) R-Player
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TE-38 Duet ; Sonora Radio & Telev (ID = 513621) R-Player
Sonora Radio & Telev: TE-38 Duet [R-Player] ID = 513621 812x700
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For model TE-38 Duet, Sonora Radio & Telev. Corp.; Chicago (IL):
Restored phonograph during play, shows motor shaft pull-back lever pulled out.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Sonora Radio & Telev. Corp.; Chicago (IL)
alternative name
 
Sonora Electric Phono
Year: 1939/1940 Category: Sound/Video Recorder and/or Player
Valves / Tubes 1: 70L7GT
Wave bands - without
Details Rec.Player+Audio.Amp+LS
Power type and voltage Alternating Current supply (AC) / 115 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5.5 inch = 14 cm
Power out
from Radiomuseum.org Model: TE-38 Duet - Sonora Radio & Telev. Corp.;
Material Wooden case
Shape Tablemodel, with any shape - general.
Dimensions (WHD) 12.25 x 9.125 x 7.5 inch / 311 x 232 x 191 mm
Notes

Resistance line cord (320 ohm)

External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 13 = 1942 and before
Literature/Schematics (3) -- Original prospect or advert (The Sonora Folder for 1940.)


All listed radios etc. from Sonora Radio & Telev. Corp.; Chicago (IL)
Here you find 334 models, 199 with images and 250 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Sonora Radio & Telev: TE-38 Duet
Threads: 1 | Posts: 1
Hits: 4465     Replies: 0
sonora-rad: TE38; replace 70L7 with 117V version?
Joe Sousa
26.Oct.08
  1

It would be nice to replace a 70L7 with a 117V version to eliminate the need for power cord resistor, but when I was looking for a 117V plugin replacement for the 70L7 I found that there was no replacement with the same pinout, and that the 70L7 puts out twice as much power as the 117L7, with the same 110V Bplus.

This is because the 117L7 has a set of curves that works better with a higher impedance and a higher B+. It would be voltage starved in this application. A higher B+ and higher load impedance in the output ransfomer load line shown below, would have increased the possible p-p swing.


The squarer, more tetrode-like set of curves of the 70L7 can fit the lower 2k impedance load line and double the current swing cleanly.

The distinguishing feature of low voltage power pentodes is that they have a lower voltage knee to give more headroom for a wider current swing.

Taking a look at 6L6 high voltage pentode vs 50C5 low voltage pentode confirms this.

In series heater power pentodes, a different heater voltage may mean also a different curve family.

Comments invited,

-Joe Sousa

 
Sonora Radio & Telev: TE-38 Duet
End of forum contributions about this model

  
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