Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 25229
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Tube type:  Photomultiplier 
Identical to 1P28
First Source (s)
01.Sep.1950 : -- Original-techn. papers.

Base Sub-Magnal 11 pin

Ultraviolet-sensitive (S5/UVA, 3400 Angstroms). 9 stage, side-on type having S-5 response. Wavelength of maximum response is 3400 
+/- 500 angstroms. This type makes use of cesium-antimony dynodes and a cesium-bismuth, opaque photocathode. Window material is Corning No. 9741 ultraviolet transmitting glass or equivalent. Tube has a non-hygroscopic base. Supply voltage DC/peak AC between anode and cathode 1250 volts.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
33 x 94 x mm / 1.30 x 3.70 x inch
Weight 45 g / 1.59 oz
Tube prices 1 Tube prices (visible for members only)
Information source - - Manufacturers Literature   RCA Phototubes and Photocells PT-60

1P28: Karl Reiter
Karl Reiter

1p28_sock.png 1P28: elektron taschenbuch 1952
Heinz Höger

More ...

Just Qvigstad
1P28: Original Datenblatt
Karl Reiter

More ...

Collection of



You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]

Data Compliance More Information