AW: [sdiy] radio distribution (was: bio electricity)

[Czech Martin]

What about telephone broadcast?
Which is very good, because it implies the use of telephones,
which I presume is not the case. ;->

m.c.

> -----Ursprüngliche Nachricht-----
> Von: Alex Stettler [mailto:alex at xatomic.ch]
> Gesendet: Montag, 5. November 2001 14:18
> An: DIY Synth List; Dave Krooshof
> Betreff: RE: [sdiy] radio distribution (was: bio electricity)
> 
> 
> Hi,
> 
> 
> We had this system of radio distribution over the telephone 
> network here in
> Switzerland, too. It was called "Telefonrundspruch" (Well, at 
> the moment
> I really don't know how to translate this, so I leave it as is ;-).
> It was taken out of service only some years ago.
> It was mostly used in older houses, hotels etc.
> 
> Alex
> 
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Dave Krooshof
> Sent: Monday, November 05, 2001 10:35 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] bio electricity
> 
> 
> >Do you remember the FM audio distribution allong the
> >home mains power lines?
> >
> >m.c.
> 
> Yes, I do. That is: Im too young to remamber, but I have the 
> equipment.
> Here's a last weeks email pingpong from Harry and me.
> Maybe you can shine another a light on the safety issues...
> 
> _________________________________________
> --- Dave Krooshof <krooshof at xs4all.nl> wrote:
> > A tube question, Harry,
> >
> > I happen to have a 3 tube amp from the Radio Distribution.
> > That was a thing from the fifties, when the Dutch Phone
> > company used the telephone lines as a radio transmitter.
> > In the house was a box mounted on the wall. It had a switch
> > to choose between 5 chanels. Then it had a switchable trafo
> > for volume. The amp is totally weird. It hasn't got a trafo, nor
> > for the power supply, nor for the speaker. No readable info
> > anywhere on the print, parts, or box.
> > The odd thing is... I connected a jackcable to its input.
> > When I touch it, it doesn't hum, it beeps. Even louder when I lick
> > the plug. And it's tunable with a crybaby (not with other wah's).
> > Then I make beating patterns with a flanger and a chorus.
> >
> > What is your guess, what happens in the amp?
> > AM?
> 
> My Guess... it may be a transmitter, probably AM if its from the
> 50's... FM was just getting started and not common yet.
> 
> Probably rectifies the line directly for HV, and runs the filiments
> in series (maybe 3 tubes @ 12V each... 36V... then some resistor
> in series so it don't blow.
> Is there an incandescent lamp anywhere... pilot light
> maybe... that could be part of the dropping circuit.
> 
> > And can there be any danger that one day 240 volts
> > will hit me when a tube decides to break down?
> Yes...  I would not lick the plug too often....
> 
> Y'know it might use a series capacitor to drop the voltage to
> the filaments...
> anyway... its dangerous. I only lick 9V batteries, tops... and I'd
> transformer isolate AND ground lift if I was gonna do it on stage...
> 
> <video cue... cartoon electric shock... where the body flashes yellow
> and black, and you can see the bones inside... >
> 
> H^) harry
> 
> 
> >
> >
> > Dave
> 
> 
>