FA Heathkit electronics trainer . LN works
 

Heathkit Digital Trainer AC powered

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2566410867
This is a working Heathkit trainer Model ET-3100 with such things a
Power supply with Positive control knob and negative control knob.
Connetor blocks to make solder less connections. A 1 k ohm contol knob
.. this is a variable resistor for your experiments. also a 100k ohm
knob for the same. Breadboarding board to make solderless connections
.. A range switch to selects the frequency range of the signal
generator. (low or High) A frequency control knob = varies the
frequency of the signal generator fromn 200hz to 2khz. connector
blocks for sine gnd and square wave.. Red led for unit power on
indicator. Two large schematic sheets for the trainer are included. A
GREAT GIZMO FOR A ELECTRONICS ENTHUSIAST. Shipping in the USA is
$13.00 Canada is $17.00