Re: [usa-tesla] Rectifier Question
- At 10:06 AM 7/04/00 , Jim Farrer wrote:
>Dear Jet,I'm guessing that the variable resistor has values other than "ohms" , but
>You wrote of your glomination ("glommed onto" in U.S dollers) of
>a mystery box.
>I believe what you are describing here is a new mystery box.
>======>> I'm including your first mystery box memo at the end of
>I can't make any guesses on the current box. Does it have
>other than the switch, variable resistor, and selenium plate
thats all there is to it , I took some photo's of it yesterday they should
be developed within a week or so.
I will be acquiring a cheap & nasty (read expendable but reasonably
accurate) multi meter from www.jaycar.com.au cat number QM1490 or similar
that should help me measure out simple (non HV) capactiance & inductance in
the things I find or am trying to figure out.
As far as the first mystery box goes it is a confirmed analog RF signal
generator , freq range of
(outer scale) 10Hz to 90 Hz
C 20M Hz to 6M Hz
B 1500K Hz to 500K Hz
A 520K Hz to 400K Hz
The C , B , A freq ranges are actually marked as "mc" & "kc" , which I take
were Mega & Kilo Cycles at the time of construction RF1 jpg
RF2 jpg is an underside view of the box , the paint tin I refer to is
actually a cream can , mounted behind the front switch marked 1 to 6 , you
may have to mess with the brightness or contrast to get some of the finer
details from the pic , there is not a printed circut board to be seen in it.
>Why is it that this stuff is more interesting than my federalBecause the idea of combining valves/analog switching with
semiconductor/digital switching is almost as creative as filling out your
<snip initial syntron/rectifier post>
>J.B.'s first mystery box memo:
> [usa-tesla] Help Required with Valves & the like.
> Mon, 23 Aug 1999 14:34:30 +1000
> Jet Black <blackj@...>
>From: Jet Black <blackj@...>
>Whilst shopping through the local "bazaar" the other day , I came
>interesting "hand crafted" aluminium box with a hand marked (180
>band) indicator dial (the dials controls are of bakelite
>a 240V AC lead coming out of the back of it.
>I thought this looks interesting so I haggled with the merchant &
>for $20 (Australian)
>When I asked the merchant what he knew of it & what it does , he
>lapse in memory (to the point that he could no longer speak
>I was quite happy with my purchase of this "mystery box" as I
>had a vague
>idea of what it was..........
>I was unwilling to plug it in & try it out when I finally had the
>take a closer look , besides it was late at night 240 Volts and
>box's don't mix too well so , I decided on an autopsy to see what
>Autopsy notes follow:
>Check fuse ,the fuse has been tampered with & another higher
>of fusewire had been resoldered back into the fuse , leaving the
>fuse wire alongside the new heavier
>guage fuse wire.
>Definately hand built , I had to drill out a lot of blind rivets
>into the back of it.
>Upon sliding the thing out of the box , my jaw dropped , it's got
>it , WOO HOO ! (as in Homer Simpson)
>They are marked.
>6V4 , 6BE6 , 12AT 7 (2V4) (made in England).
>Plus olde capacitors , resistors , hand wound coils and all sorts
>, some of the parts could be immediately identified , others
>of the switches is shrouded by old paint tins and soldered shut.
>It appears <imho> to be a hand built RF analog signal generator
>Something someone has built for their own private use _many_
>years ago ,
>maybe built by a man ahead of his time at the time , I'll try to
>builder or any of his friends down & have a quiet chat with
>In the mean time , I will take some decent photo's & videotape
>If you have read this far thank you :) this is where I very
>for some help & guidance in order to get this thing cleaned up
>I'm still pouring over it with a jewelers magnifying glass trying
>reverse engineer it and draw up a schematic diagram of sorts for
>parties to view.
>Any tips or local knowledge on how to handle clean & maintain
>this sort of
>"old school" tech would be greatly apprectiated.
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