Brett, Those 813's are practically indestructable --- and I should know, too, having used them in my amplifier for some 16 years now (only had to replace the tubes ONCE!...and we're talking surplus/Hamfest jugs here, too)...
I have examples here of BOTH the graphite AND metal plates --- NO IDEA how the metal plate versions retained the same "813" number --- it CAN'T possibly be the same tube! --- but it has. I have yet to use the metal ones, though... Never could understand why guys spend the big $$$ for tubes --- albeit modern, low drive, efficient ones --- when rugged, bargain basement bottles like the 813 still abound... ~73~ Eddy VE3CUI - VE3XZ ----- Original Message ----- From: "Brett gazdzinski" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio'" <[email protected]> Sent: Tuesday, January 31, 2006 2:20 PM Subject: RE: [AMRadio] 813 question > I have about ten 813 tubes, mostly hamfest specials, actually, > they are ALL ham fest specials. > > When I built the 813 rig, I picked 2 and plugged them in, been using > those same tubes for 15 years. > At one point, I went through my collection, plugging in one tube > at a time, and they all worked well. > > I think there are 2 different kinds, ones with graphite plates, and a few > with metal plates? > > > Over all the years of using tubes, I had one 75th loose its filament, and > one 4d32 has a piece of metal floating around in it (but it works), and > I have an 811 with no plate cap. The 75th was the only one that ever failed, > although I have got some bad tubes at fests (4-400, 4cx250b). > > The Russian 811 tubes all have loose bases and I don't use them. > > Brett > > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of ronnie.hull > > Sent: Tuesday, January 31, 2006 1:17 PM > > To: Discussion of AM Radio > > Subject: Re: [AMRadio] 813 question > > > > > > I have certainly never heard of that, but I'm no expert. > > However, I have a box > > full of 813's that are ww2 vintage and NONE of them have loose bases. > > > > R > > > > > > ---------- Original Message ----------- > > From: charles free <[EMAIL PROTECTED]> > > To: [email protected] > > Sent: Tue, 31 Jan 2006 07:12:56 -0800 (PST) > > Subject: [AMRadio] 813 question > > > > > Hello all, > > > > > > I have a buddy who insists that if I don't get my old > > > 813's out of the "future project" box and fire the > > > filaments up on them now and then, the base seals will > > > eventually deteriorate. I guess he is talking about > > > the adhesive that secures the base to the bulb. I > > > don't see how the glass envelope where the leads pass > > > through the glass could be affected by lack of use, > > > but maybe one of you folks has experience with this. > > > Anybody heard of this one before? > > > > > > W4MEC, Charlie in NC > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Tired of spam? Yahoo! Mail has the best spam protection around > > > http://mail.yahoo.com > > > ______________________________________________________________ > > > AMRadio mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > Help: http://mailman.qth.net/mmfaq.html > > > Post: mailto:[email protected] > > > AMfone Website: http://www.amfone.net > > > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb > > ------- End of Original Message ------- > > > > ______________________________________________________________ > > AMRadio mailing list > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:[email protected] > > AMfone Website: http://www.amfone.net > > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
