Hi Mike,

the 2N508 seems to be ideally suited for use in amateur
LF rigs as it said to be specifically designed for
"entertainment equipment" ;-)

Data from 1975 vintage Motorola books:

2N1309

"PNP germanium general purpose amplifier."

Case:
  TO-5, pinout=?

Maximum ratings:
  PD: 150mW
  VCEO: 30V
  IC: 300mA

Characteristics:
  hFE (IC=10mA): 80 min.
  fab ("frequency cutoff"): 12MHz (fT~9.6MHz)
  Cob: 20pF max.
  VCEsat (IC=10mA): 200mV max.

2N508

"PNP germanium transistor for audio driver and low
power output service in entertainment equipment."

Case:
  TO-5, base-emitter-collector counting clockwise from
  the "tab" (bottom view). Base connected to case.


Maximum ratings:
  VCB: 18V
  VCEO: 18V
  VEB: 5V
  IC: 500mA
  Tj, Tstg: -65..+100C
  PD: 225mW

Characteristics:
  ICBO (VCB=-16V, IE=0): 16uA max.
  IEBO (VEB=-3V, IC=0): 16uA max.
  BVCER (IC=0.6mA, RBE=5k) 18V min.
  hFE (VCE=-1V, IC=20mA): 99..198
  VBE (VCE=-1V, IC=20mA): 180..320mV
  Cob (VCB=-5V, IE=1mA, f=1MHz): 35pF max.
  fab ("frequency cutoff", VCB=-5V, IE=1mA): 2.5MHz

73
Johan SM6LKM



--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 268.1.0/269 - Release Date: 2006-02-24