[Boatanchors] FS: McMurdo Silver 905-A sig tracer

[Bry Carling]

FOR SALE: McMurdo SIlver 905-A "SPARX" signal tracer from
1947. Includes probe. Fair to good condition. It's all there. Case handle is torn up. 

I found an article available on this unusual goodie, with schematic if anyone is interested.  
It's basically a small 3-tube audio amplifier with built-in speaker and 120V AC supply.  

Not bad for $12.00 plus shipping.

73 - Bry AF4K