This poster of Graymark’s kits is about 3.5 x 2.5 feet. It dates from the 1970’s and was intended to be displayed where students could see it and browse for a project.
The Graymark poster hanging in the radio shack.
The Graymark Micro-Museum includes 5 constructed kits that are fully restored and functional; a number of original kits that have not be constructed; and a number of manuals and documents.
A 501 Crystal Radio was one of the simpler kits.
The 506 radio has 5 tubes (follows the American 5 tube radio lineup – 50C5 35W4 12AV6 12BE6 & 12BA6). It covers the standard AM broadcast band and a Shortwave band. It also has a phono jack input to function as an audio amplifier
The 510 AM radio also uses the 5 tube American radio lineup
The 511 regenerative All Band Radio used 3 tubes and plug-in coils. By placing the receiver slightly into regeneration, it was possible to receive CW and SSB signals. However, stability & selectivity were very poor. Detailed info is here:
The 515 micro-power AM transmitter used 3 tubes.
An unopened 505 AM transmitter kit
A Graymark 512 8-transistor portable radio kit that was never assembled.
The Graymark 525 table top radio came with a wooden cabinet. It used a standard 5-tube American radio lineup like the 510.
Manuals for some of the kits.