The problem still was that if plugged into the hot side of the line with the remaining good fuse, the primary, switch etc was HOT to ground all the way back to the wall plug, Lot of good chances to get stung, a well grounded chassis the opposite of what you would want.. Remember the old isolation trainsformers?, Really old radio books called for a SINGLE pronged plug for AC-DC stuff, relying on the chassis ground to make it work, which has a set of pitfalls all of it's own, your ground has 110 volts potential to the power company ground, hopfully the sub surface ground was connected to the power ground or "Curtains again!" Mike
----- Original Message ----- From: George Pritchard <[EMAIL PROTECTED]> To: <amradio@mailman.qth.net> Sent: Thursday, February 27, 2003 1:16 PM Subject: RE: [AMRadio] Series capacitor equalizing resistors - now Johnson Power Plugs > Since they didn't have polarized outlets in the old days, the plug could go > in either way. They had to fuse both sides for safety, and mandate the > chassis to be grounded. Of course these days, the polarized three pronger > guy is the best replacement ac line cord, with a fuse in the hot line only > mounted on the rear chassis. > George AB2KC > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Mark Foltarz > Sent: Thursday, February 27, 2003 12:59 PM > To: amradio@mailman.qth.net > Subject: Re: [AMRadio] Series capacitor equalizing resistors - now > Johnson Power Plugs > > > Mike, > > You are absolutely correct about those fused line plugs. > > But I got to thinking about the philosophy behind those things. > > Way back when, proper installation of radio gear was specified as > including a > ground - both RF and electrical. If the operator made the installation > correctly, the chassis was always cold. > > I think the engineers of that time believed that the operator was going to > be > responsible and install that chassis connection to a real electrical ground. > > Just a thought. Was operator forethought and responsibility part of > correctly > using those plugs or were they just plain dangerous? > > Yours, > > de KA4JVY > Mark > > > > > --- Mike Dorworth K4XM <[EMAIL PROTECTED]> wrote: > > Hi folks, just a little about the fused line plugs. You don't see them > > anymore because of their killing ability, which is very good. All you need > > is the fuse in the cold side of the line blown and of course the hot stuff > > goes in through and all the way back to the open fuse meaning the entire > > thing is full of juice waiting for a finger, might have been alright if > they > > were polarized which there were not and of course the sockets were not > > either.. RIP with those literally.. 73 Mike K4XM > > ----- Original Message ----- > > From: Mark Foltarz <[EMAIL PROTECTED]> > > To: <amradio@mailman.qth.net> > > Sent: Wednesday, February 26, 2003 3:57 PM > > Subject: Re: [AMRadio] Series capacitor equalizing resistors > > > > > > > Wayne, > > > > > > The other oddity of that period was of course the fused plugs that > > Heathkit, > > > Johnson and other manufacturers used. > > > > > > Come to think of it, do you suppose the cord on that particular AT-1 > is > > not > > > original? I forgot if you described the schematic as specifically not > > having a > > > fuse anywhere including the line cord. > > > > > > Yours, > > > > > > de KA4JVY > > > Mark > > > > > > > > > --- Sara & Wayne Steiner <[EMAIL PROTECTED]> wrote: > > > > Mark > > > > > > > > The AT-1 manual says 450v, however mine runs about 460v. So , yes you > > are > > > > right, the series combo has a rating of 700v which is substantially > more > > > > than what it sees. > > > > As I mentioned earlier, the AT-1 has no fuse (mine will soon have > one ). > > My > > > > AT-1 was a $5.00 flea market item which came without the power xfmr. > The > > > > corner of the chassis where the xfmr was mounted was covered with > black > > crap > > > > where the xfmr obviously had a melt down probably due to a failed > filter > > > > caps and no fuse protection! > > > > > > > > 73 > > > > Wayne, N0TE > > > > > > > > _______________________________________________ > > > > AMRadio mailing list > > > > AMRadio@mailman.qth.net > > > > http://mailman.qth.net/mailman/listinfo/amradio > > > > > > > > > __________________________________________________ > > > Do you Yahoo!? > > > Yahoo! Tax Center - forms, calculators, tips, more > > > http://taxes.yahoo.com/ > > > _______________________________________________ > > > AMRadio mailing list > > > AMRadio@mailman.qth.net > > > http://mailman.qth.net/mailman/listinfo/amradio > > > > > > > > > --- > > Outgoing mail is certified Virus Free. > > Checked by AVG anti-virus system (http://www.grisoft.com). > > Version: 6.0.455 / Virus Database: 255 - Release Date: 02/13/2003 > > > > _______________________________________________ > > AMRadio mailing list > > AMRadio@mailman.qth.net > > http://mailman.qth.net/mailman/listinfo/amradio > > > __________________________________________________ > Do you Yahoo!? > Yahoo! Tax Center - forms, calculators, tips, more > http://taxes.yahoo.com/ > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.455 / Virus Database: 255 - Release Date: 02/13/2003
