You are biddng on a pair (2) of Altec Lansing Model 1578A Transistor Preamplifiers/ input transformers. These plug into standard 8-pin sockets. They appear to be in good original condition, but are untested. They show the following on the side:
Source 150 Ohms
Usable 30K to 20K Ohms
Load 600 Ohms
Gain 33.5 DB
Output +8 DB
Power 12 VDC ay 13 MA
They measure 1 1/4 inches in diameter, and are 1 3/4 inches tall, above the pins. They should be needed by someone. Shipping weight is 8 ounces. Please see my pother auctions for more interesting radio and audio items and tubes.