They don’t calculate , they use the trial and error method.
They think it’s normal to loose a doorknob cap, vacuum variable capacitor, tube etc. Swap part with the next size up and repeat.
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On 2025-03-12 10:28, HaL Mandel via groups.io wrote:
When bolting-up the tube sockets for the GU-84b's
I could tell they were some doozies.
Cleaning the silver metal without removing
it from plated instead of solid metal contact
areas required a toothbrush and a pile or two
of Kool-Amp silver plating powder to get the
'low hanging fruit' acceptable.
The big surprise for me were these green glazed
oblong-shaped capacitors with silver metal flat
contacts on each end. They formed a circle around
one of the concentric parts of the sockets.
The grid port, going back through the neutralizing Breuhne bridge
is bypassed, or perhaps better named as "loaded" with a non-inductive
450 ohm, 50 watt 1% resistor that can easily be replaced
or removed as the neutralizing process is analyzed on the bench.
With the cost of all these little specialized pieces taking longer to
agree with myself that the purchase will probably be useful has
gauged my efforts in getting this project 'hot' and making satellite
contacts on 10m.
This is why, looking at the 500MW nuclear reactor experiment
elsewhere, I wonder who performed the calculations for each
and every component, and how did the design choice fare on
a peer review for viability, feasibility and reasonability?
Hal
W4HBM
Links:
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[1] /g/ham-amplifiers/message/41070
[2] /mt/111589618/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
