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328A

Information - Help 
ID = 9683
       
Country:
Worldwide
Brand:
Tube type:  Vacuum Pentode   Universal 
Identical to 328A = S328A = CV2619 = 4328A = 5A/136A
Similar Tubes
Heater different:
  S310A
Other base:
  4328D ; 5A/136D ; CV245
Other base and other heater:
  310A
First year 1937 - - Manufacturers Literature Western Electric Company Inc.: Voltage-amplifier

Base 6-Pin-Base U6A, old, USA (Codex=Kf) Top contact with a cap
Was used by Telephony
Filament Vf 7.5 Volts / If 0.425 Ampere / Indirect / Parallel, (AC/DC) /
Description

Similar to 310A with different heater. Silvered pins, gold-plated grid.
WE writes in 1937: "The electrical characteristics of the 328A tube are identical to those of the 310A tube except for the heater voltage and current."

"This tube is intended primarily for use in audio, carrier and radio-frequency voltage amplifiers, oacillators or modulators. The connection for the suppressor grid has been brought out to an external terminal, thus making the tube more flexible in its applications." ... "A small, metal cap control-grid terminal is located at the top of the bulb."

The tube was widerly used for telephone repeaters and was also made by Valvo in Germany - and used for military purposes.

 
Tube prices 3 Tube prices (visible for members only)
Literature Tube Lore   
Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature

 
328a.jpg
328A: eigenes Bild
Harald Straub

 
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328A: rtt
Michael Schlör

 
328a_data1.png
328A: own collection
Peter den Boer



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