>
>>>When it had a VHF visitation, my old ''plywood box'' amplifier would
>>>Blow the parasitic suppressor resistors into something like cosmic
>>>dust. My guess is that the engine for this transaction was the
>>>1000 Joules that were stored in the 9200v supply. The transaction
>>>took place so quickly that it never tripped the breakers.
>
>>>>But they resistors don't blow up nor do they "look">>
>>physically damaged.
>>>>
>>>The above resistors were disappeared. Forrest Gump was right.
>
>Dear me, I did see the Forrest Gump movie, but I recall not the simile,
>could you please enlighten this luddite?
>
? "Shit happens" -- Forrest Gump. Murphy said something similar.
>Then - the plywood box amp seems to have an extraordianry ability. Does
>this amplifier still exist?
Yes
>As a prospective author, I'd dearly love to
>make some network measurements on it, and outfit it with peak measurement
>apparatus to see what is "up" with it.
To do this, you would have to remove the present all Ni-Cr alloy vhf
suppressor device and install a copy of the suppressor whose R-supp
virtually disappeared. .
> VHFYou say it has a "VHF visitation" so
>I assume you actually measured a VHF occurance. What was the frequency
>observed?
A bit under 68MHz. No measurement was made during the big-bang. The
anode-resonance that apparently supported the event was found with a
dipmeter..
> What was the length of time the pulse lasted (if it was a pulse)?
beats me. It sounded like a shotgun, only louder. .
> How did you discern that it was not one of Eimac's fabled "barnacle"
>incidents?
>
At 15kV, the tube subsequently exhibited an above avg. vacuum. This was
hardly surprising since the tube had recently been rebuilt by Econco
Broadcast Services. A VHF visitation seemed likely because the
carbon-comp R which disappeared was DC shorted by <2milli-ohms of
buswire. // RE: Eimac. I have never seen an Eimac engineering
bulletin on parasites. Have you? // I have listened to Rauch's banter
about appearing/disappearing barnacles. It reminded me of a ''sea
story'' that is oft' heard over brewskis. .
>If this amplifier does not still exist,
It still exists. 150 in does 15 out. When I used to tune it up (with a
pulser), my neighbors' porch lights blinked.
>can you provide adequate details so
>that it can be completely replicated? Oh, such a learning experience that
>should provide!
Replication is quite straightforeward, and can be accomplished with
ordinary hand tools - thanks to precision sheet metal shears, PEM-nut
fasteners plus screwed & glued douglas fir plywood. . . See "Ugly" on
my Web site. Photos are provided of a slightly smaller version using a
more linear tube. . A simplified diagram of the only thing in the
amplifier that is somewhat unique is provided. (the grid circuitry)
>
cheers, Fred
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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