I'm aware that in some situations TO92 transistors marked C556 mean BC556
(not 2SC556), can the same be for BF...?
I have a board with dozens of BF422, HV transistors on. These agree with the
schematic but someone has previously replaced 2 with a pair marked F422 and
one of them has failed B-C-E short. Diode testing (Vb-c Vb-e) the
remaining one shows correct pinout for BF422

"N_Cook" wrote in message
...
I'm aware that in some situations TO92 transistors marked C556 mean BC556
(not 2SC556), can the same be for BF...?
I have a board with dozens of BF422, HV transistors on. These agree with
the
schematic but someone has previously replaced 2 with a pair marked F422
and
one of them has failed B-C-E short. Diode testing (Vb-c Vb-e) the
remaining one shows correct pinout for BF422


That marking style is fairly common.

ian field wrote in message
news:8i13o.319199$k15.160568@hurricane...

"N_Cook" wrote in message
...
I'm aware that in some situations TO92 transistors marked C556 mean
BC556
(not 2SC556), can the same be for BF...?
I have a board with dozens of BF422, HV transistors on. These agree with
the
schematic but someone has previously replaced 2 with a pair marked F422
and
one of them has failed B-C-E short. Diode testing (Vb-c Vb-e) the
remaining one shows correct pinout for BF422


That marking style is fairly common.



I don't remember coming across it before for BF... , a few times I've seen
it with Philips TO92 BC... types