Re: Unknown transistor osc.
Salford Electrical Instruments, a subsidiary of GEC were based in Times Mill Heywood Lancs. Now demolished and rebuilt as a Morrisons.
Their Quartz department made crystals from raw quartz, and the head of that department was Dave Standring, a very competent and amicable chap.
What's inside will be first class.
SEI also made ferrites and metal dust magnetic cores, film capacitors, the heated window antenna converter for Ford (patented!) and they made the 'Selectest' GEC's rather nice rival to the AVO 8.
QC is their normal prefix for crystal oscillators of all types. I no longer have their catalogues and spec sheets, sorry.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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