[Milsurplus] BC-221Tempature compensating Capacitors Last call.

[jcoward5452 at aol.com]

I wonder if all my BC-221-*'s and LM-*'s have this awful drift problem?
I tested an AN/ARR-1 test set on a spectrum analyzer once at work and 
it was a NOS, never turned on except at the factory, unit and it was 
within >50 Hz after 60+ years of sitting on a shelf somewhere.(This is 
a VHF cavity tuned source). I was impressed.I am also impressed that 
every LM or BC-221 I own,(or have owned), always got me on frequency 
for any net I wished to copy on the HF bands.Even those with no Cal 
Books that I've done cursory zero beat cals for specific 
frequencies.Why this dissection of the venerable BC-221,a workhorse 
frequncy standard for decades and possibly decades more?And what works 
for one model may not work for others.Anyway,I appreciate the effort to 
characterize your particular BC-221 but unless you do the same for 
hundreds if not thousands of every variant, the statistics of one does 
not carry much weight.
My .02
Respectfully,
Jay KE6PPF