Amie Wrote:Would results more qualitative than quantitative, regards measurements? It should at least show resonance of a tuned circuit pretty near where it should be if capacitive loading could cause a shift.
Hopefully reasonably quantitative. I haven't attempted any sort of calibration check, but will do next day or so. I'd expect it to have a constant attenuation, as a cathode follower, gain input to output will be about 0.95.
What I'm not confident of is, signal handling capability up to more than a few volts, especially at higher frequencies.
Your oscillator...
Sinewave looks really good and pure
Stabilisation method is novel, and 1% variation over the band, shows it's doing its job well.
What happens if you up the HT and use a higher value load, such that the average anode voltage or the supply current is the same?
Surprised at the chokes being wound in random direction, reason being, I'd expect them to be machine wound and all the same. Unless Epcos are running two kinds of machines, which rotate in opposite directions...
And, those valves which are decorating that birthday card (friend of yours I guess?), the pair of smaller ones look like the 1j24b! Which seems to have become my go-to small-signal battery pentode, sort of thermionic BC107. (And as no valve deserves to be compared with sand, I'm now off to wash out my keyboard!)
