[ARC5] [MRCG] Attic Archaeology

[Dennis Monticelli]

Heater to cathode leakage.

On Mon, Apr 20, 2015 at 6:16 PM, Jay Coward via ARC5 <arc5 at mailman.qth.net>
wrote:

>
> ,
>  What exactly is the H-K test? I have two TA-12  transmitters with I think
> 4 ea 807's. If I can do this test with a TV-7 tube tester I could save you
> the trouble of the test and maybe cull a few out. I only need tubes for
> one. the other is a parter or a project for someone else.
>  Jay
>
>
> -----Original Message-----
> From: Scott Robinson <spr at earthlink.net>
> To: Jim Falls <radio-tuber at att.net>; MRCG <mrcg at mailman.qth.net>; ARC-5 <
> arc5 at mailman.qth.net>
> Sent: Sun, Apr 19, 2015 9:03 pm
> Subject: Re: [MRCG] [ARC5] Attic Archaeology
>
>
> Folks,
>
> I'd like to make a plea here. The Colossus computer in the UK  (which
>
> runs and is demonstrated regularly), which was used to decode the German
>
> high command code during WWII, uses a number of 807s (50, I think). For
>
> reasons of preserving all details of the original design, they won't use
>
> 1625s. Don't ask, I already had that argument when I was there and they
>
> weren't willing to budge on this point
>
> I sent them about 30 such tubes last
> year, and they were very grateful.
> If anyone has good (doesn't have to be new)
> 807s, I would like to get
> them, do the special H-K leakage test that Colossus
> requires, and ship
> the ones that pass off to the UK. I will return all that
> fail the H-K
> test to the original owner. In my experience so far, about half
> of
> otherwise perfectly good 807s pass this
> test.
>
> See
>
> <http://www.tnmoc.org/>
>
> for info about the museum,
> and
>
> <http://www.tnmoc.org/explore/colossus-gallery>
>
> for Colossus-specific
> stuff.
>
> It's a really good cause, and if any of you are in the London,
> Bletchley
> Park, where Colossus and other such things are located, is a 45
> minute
> commuter train ride out of (as I recall) London's Euston station. The
>
> entrance to the park is about 1000 feet from the train
> station.
>
> Peace,
>
> Scotty Robinson
>
> On 4/18/15 1:50 PM, Jim Falls wrote:
> >
> I have 18 NIB 1625's and 3 loose that test excellent/near max scale on my
> Hickok
> 600. Anyone need some? I'll bring them to SLO.
> >
> > At least a dozen nib 211's
> also.
> >
> > More later as I progress.
> >
> > Cheers!
> > Jim K6FWT
> > CBLA #37
> >
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