27 Apr
2016
27 Apr
'16
5:40 a.m.
European tubes are easy to evaluate in that respect
because the letter codes
designate what's inside. I remember the EABC80 (not sure that's the correct
EABC80 _is_ the correct number. It is a triple diode triode. The number decodes
as follows :
E : 6.3V heater
A : diode
B : double diode (so a total of 3 diodes)
C: triode
8 : B9A (noval) base
There is also the (more common) UABC80 (with a 100mA heater for series
string use) and PABC80 (least common, with a 300mA heater for series
string operation).
number), which is a diode plus double-diode plus
triode. Intended application,
if I remember right, was FM detector (discriminator, double diode), AGC detector
(single diode) and audio preamp (triode).
More often it was used in AM/FM radios. 2 diodes for the FM detector and one for
the AM detector and AGC. And the audio amplifier triode.
-tony