> sorry for my ignorance but what's an RA53? Yes, I've
> searched but found no information. :)

As Alan says, RA53 very popular thermistor for audio oscillators.
I've had an oscillator made from a circuit in the Maplin catalogue
of around 1978. Worked very well, except, oh dear, I broke the
RA53. I have another oscillator now and wouldn't pay the $40
for a new RA53 or even probably bother shopping around

You can see an RA53 here, at Radio Spares site

http://www.rswww.co.nz/

Enter 151114 as the product code in the Search And Find option

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