Graymark Micro-Museum
The Graymark Micro-Museum includes a number of constructed kits that are fully restored and functional; additional constructed kits that are untested; a number of original kits that have not been constructed; and a number of manuals, documents, a poster and a catalog. Many of the kits were various types of simple radios, but there were many other types of electronic kits.
A brief history of Graymark, the electronics kit company is in the following document. The company existed from about 1961 to about 2023
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.
Part of the Graymark Micro-Museum
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:
http://www.ka2c.com/graymark-511/
The 515 micro-power AM transmitter used 3 tubes.
An unopened 505 AM transmitter kit
An assembled 505 AM Transmitter
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.
The 509 audio amplifier had a bright red chassis.
The 502 is a 12 VDC power supply using a transformer, full wave rectifier and capacitor filter.
The 523 strobe light had psychedelic lettering.
The 802 was a 2-transistor radio similar to the earlier 508.
216 VOM
218 Digital Multimeter
Project Ideas Booklet – It contains about 10 simple projects
Graymark Catalog from 1974 – This contains many of the Graymark kits up to that time, but also a number of discrete components and kits from other companies
Manuals for some of the kits.
601 robot kit
603A robot kit
606A robot kit
Komponent kits