On 09/05/2015 11:05 PM, DaveC wrote:
[Who] made the item in question. [?]
John :-#)#
An American offset printing equipment company. Its a paper/envelope feeder
for a small offset presses. Extinct company.

I can say that the bandwidth requirement of the circuit is very small€”DC-10
KHz€”and low current. Dont know about gain.

Thanks.


There are pretty simple circuit diagrams out there to measure gain if
you have more transistors with the same markings.

One example:

http://electriciantraining.tpub.com/.../14179_111.htm

The only other criteria are breakdown voltage and current. If it only
drives other transistors and resistors to Vcc are over around 2K then it
is likely 100ma or less.

If you know the Vcc you know the minimum breakdown voltage unless it is
being used to control solenoids that have their own B+ source, then that
voltage is your absolute minimum (times at least 2).

John :-#)#

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