UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - What is your oldest Homebrew / Kit still in everyday use?

Skywave · 2nd Jan 2008, 5:28 pm

Oldest bit of test kit here that gets occasional use is a home-design audio oscillator based on uA709C op-amps in a Wein Bridge cct., with a FET for amplitude stabilisation. Dates from circa 1975.

Oldest bit of home-brew kit that only very rarely gets used (these days) is a grid-dip oscillator (based on a design in PW). Tunes to 150 Mc/s. Uses EF91 + plug-in coils. Built approx. 1968.

Oldest bit of (home-modified

) commercial kit - but in regular use - is an Eddystone 640A receiver. Date of manufacture = 1947.

Al / Skywave.

2nd Jan 2008, 5:28 pm	#9
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: What is your oldest Homebrew / Kit still in everyday use? Oldest bit of test kit here that gets occasional use is a home-design audio oscillator based on uA709C op-amps in a Wein Bridge cct., with a FET for amplitude stabilisation. Dates from circa 1975. Oldest bit of home-brew kit that only very rarely gets used (these days) is a grid-dip oscillator (based on a design in PW). Tunes to 150 Mc/s. Uses EF91 + plug-in coils. Built approx. 1968. Oldest bit of (home-modified ) commercial kit - but in regular use - is an Eddystone 640A receiver. Date of manufacture = 1947. Al / Skywave.