"Jim Lesurf" wrote in message


Yes. In fact IIRC some of our older sinewave oscillators in the
teaching labs use a small incandescent lamp to stabilise the gain of
the oscillator.

Case in point most really old oscillators, including the amateur's fave -
the Heath IG-18

(That makes me also recall that I think the old
'Sound Technology THD analyser I used to use also did something
similar.)

The alternatives use either photocells (typcially CdS) or later on, FETs.

I published a CdS cell update for the IG-18 a few decades ago in Audio
Amateur.

Audio Magazine published a series of articles for construction of a modern
THD analysis rig that used a FET to stabilize its oscillator.