Oops! Sorry, I forgot to respond off list. Ellen - AF9J
----- Original Message ----- From: "Brett Gazdzinski" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" <[email protected]> Sent: Saturday, February 23, 2008 9:23 AM Subject: Re: [AMRadio] More Viking 2 news > Ellen, > I think I can give you a bunch of 807's, I don't and would not use > them anymore, I go with KT88's or KT 90 tubes as modulators. > > So, I likely have a crap load of 807's (and 1625's). > > Send me your mailing address and I will get what I have out > to you. > > You should check the screen and bias voltages at the tube sockets to be > sure they are ok. > Resistors in most applications can be off 20% without causing any problems. > > Brett > N2DTS > > ----- Original Message ----- > From: "Ellen Rugowski" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, February 22, 2008 11:42 PM > Subject: [AMRadio] More Viking 2 news > > > > Hi Everybody, > > > > Work's been kind of nuts lately, and I've been pretty burned out. So, > > I've > > only been able to work on my Viking II sporadically. Last Sunday night, I > > finally got around to wiring up my D-104 with the mic connecter Ed, VA3ES > > sent me, for use with my Viking II. With the mic finally wired up, I was > > able to determine that yes, my Viking 2 is wired up for PTT (the PTT in > > mine > > works fine). I also was getting OK modulation of of my Viking. BUT, after > > no more than about 5 seconds of mic keydown, the modulator current would > > surge, and start to run away. Well, due to the fiasco the CQ 160m Contest > > is turning out to be for me, I decided to work on my Viking 2's modulator > > issue. > > > > Well, it looks like I found my problem in spades. After only about 2 or 3 > > seconds of mic keydown, in spite of the fact that I had the mic gain/audio > > level at zero, the modulator current surged again. I unkeyed the mic, let > > things settle down, and keyed up the mic again, watching the 807s. Sure > > enough, the modulator current surged again, and when it was happening, > > what > > did I see? - a nice BIG arc over between the plate and the grids on one of > > the 807s! I shut things down, pulled the 807 out that arced, fired up the > > my Viking 2 again, and keyed the mic, with only the non-arcing 807 > > installed. Nothing happened, other than the fact that the modulator > > current > > stayed > > steady at a pretty low level (due to there only being one 807 installed). > > So, it looks like I need to buy another 807. And maybe, it might > > be wise for me to get two of them, and save the one remaining good one > > have > > at the present, for a spare. BTW, the resistor on the plate cap for the > > bad > > 807 is supposed to read 22 ohms. Assuming that's it's your typical +/-10% > > resistor (personally I prefer +/- 5% or better), it shouldn't read more > > than > > say 25 ohms. The cap resistor on the bad 807 read 28 ohms. Well, there > > isn't much more I can do with the Viking 2, until I get the new 807s. I > > don't feel like pulling off the mic connector I installed for the Viking 2 > > (wiring up mic connectors is a pain), and I haven't gotten the mating > > connector yet, that I need to wire up an adapter cable, so I'm out of luck > > with using the Scout for tomorrow's Midwest Classic net. I'll only be > > able > > to listen to Rob, run the net. Well, I think I'm going to call it a > > night, > > I'm falling asleep. > > > > 73, > > Ellen - AF9J > > > > ______________________________________________________________ > > Our Main Website: http://www.amfone.net > > AMRadio mailing list > > Searchable Archives: http://www.mail-archive.com/[email protected]/ > > List Rules (must read!): http://w5ami.net/amradiofaq.html > > List Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:[email protected] > > To unsubscribe, send an email to [EMAIL PROTECTED] with > > the word unsubscribe in the message body. > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
