Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 42570
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Transistor   Audio Frequency 
Identical to AC164
Similar Tubes
Other shape (e.g. bulb type):
  AC107 ; AC122

Base Wires
Description Small PNP germanium alloy transistor intended as AF amplifier in hearing aids.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
3 x 1 x mm / 0.12 x 0.04 x inch
Weight 1 g / 0.04 oz
Information source -- Collector info (Sammler)   Towers IVT, TVT 1979/80 ECA

trans_ac164_outl_drw.png AC164: tdv1_ECA_Datenlexikon
Bernhard Nagel

Collection of



Forum contributions about this tube
Threads: 1 | Posts: 1
Hits: 1248     Replies: 0
This transistor was designed for small hearing aid equipment
Ruben Garcia Bayon

I believe this was one of the  very first small germanium transistors, designed specifically for hearing aids equipment.

End of forum contributions about this tube

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