I have some 100th's that show a blue glow when the HV is applied. Is this a sign of gas or just normal. Thank you, Jack
--- On Wed, 8/26/09, amradio-requ...@mailman.qth.net <amradio-requ...@mailman.qth.net> wrote: From: amradio-requ...@mailman.qth.net <amradio-requ...@mailman.qth.net> Subject: AMRadio Digest, Vol 67, Issue 15 To: amradio@mailman.qth.net Date: Wednesday, August 26, 2009, 11:38 AM Send AMRadio mailing list submissions to amradio@mailman.qth.net To subscribe or unsubscribe via the World Wide Web, visit http://mailman.qth.net/mailman/listinfo/amradio or, via email, send a message with subject or body 'help' to amradio-requ...@mailman.qth.net You can reach the person managing the list at amradio-ow...@mailman.qth.net When replying, please edit your Subject line so it is more specific than "Re: Contents of AMRadio digest..." Today's Topics: 1. Re: 100TH and 250TH advice and or comment (John Coleman) 2. Re: 100TH and 250TH advice and or comment (rbethman) 3. Re: 100TH and 250TH advice and or comment (Brett Gazdzinski) 4. Re: 100TH and 250TH advice and or comment (rbethman) 5. Re: 100TH and 250TH advice and or comment (crawf...@surfmore.net) 6. Re: 100TH and 250TH advice and or comment (ronnie.h...@glowbugs.com) 7. Re: VACUUM TUBES (Bernie Doran) ---------------------------------------------------------------------- Message: 1 Date: Tue, 25 Aug 2009 17:04:33 -0400 From: John Coleman <j...@pctechref.com> Subject: Re: [AMRadio] 100TH and 250TH advice and or comment To: Discussion of AM Radio in the Amateur Service <amradio@mailman.qth.net> Message-ID: <689f280218c08f4481b381de76738fe401bd87b38...@p1ec1evs02.hmc1.comcast.net> Content-Type: text/plain; charset="us-ascii" I think there is at least some truth to this Lee, but I am not sure of why. By the same token though I have run 250ths for quite some time and with many hours of no use both winter and summer without air conditioning. They seem to always work the same even though I may only fire them up once or twice a year (much to my dismay). So I really don't have any good answer for this. If all the tubes in question were assemble into the 610 at the same time then maybe you could just pass this off as "it was finally time that the air leak got to them". Don, K4KYV and Tim, WA1HLR have discussed this sort of thing quite a bit as well as deterioration of cathode coatings in both directly heated tubes and indirectly heated tubes. You may want to consult with them about this. One thing is for certain, if the final tube is weak then it will be very difficult to get it to produce a wave form output that matches the audio wave form, and it gets worse as the power demand goes up. 73 John -----Original Message----- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of LEE BAHR Sent: Tuesday, August 25, 2009 2:20 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] 100TH and 250TH advice and or comment John Moan (forgot his call and spelling) (SK) in San Antonio used to run a few BC-610s. He always rotated his 100TH and 250TH tubes to keep gassing from forming in them. He had about a dozen BC-610s and around 17 R-390A receivers in his shack. I think he used to say it was bad to lie them on their side too. He seemed to know what he was doing and swore the cycling of the tubes was neccessary to keep them alive. He claimed storing these tubes would kill them in time. I am only talking about 100TH and 250TH tubes. Lee w0vt Houston ------------------------------ Message: 2 Date: Tue, 25 Aug 2009 17:17:33 -0400 From: rbethman <rbeth...@comcast.net> Subject: Re: [AMRadio] 100TH and 250TH advice and or comment To: Discussion of AM Radio in the Amateur Service <amradio@mailman.qth.net> Message-ID: <4a9454ed.4090...@comcast.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sorry Lee! I've also been putting in some moulding in the house. (Probably misspelled it too!) It is a Honey-Do day with the wife off. I'm still trying to figure out why some that sit and have been used, versus the ones IN the radio that have sat are the ones that are the ones showing the "gassy" indications. Then there is the T-213 that has sat for several years, and the tubes are all crystal clear. I am finding neither rhyme nor reason. I'm at the befuddlement point! Bob - N0DGN LEE BAHR wrote: > John Moan (forgot his call and spelling) (SK) in San Antonio used to run a > few BC-610s. He always rotated his 100TH and 250TH tubes to keep gassing > from forming in them. He had about a dozen BC-610s and around 17 R-390A > receivers in his shack. I think he used to say it was bad to lie them on > their side too. He seemed to know what he was doing and swore the cycling > of the tubes was neccessary to keep them alive. He claimed storing these > tubes would kill them in time. I am only talking about 100TH and 250TH > tubes. > > Lee > w0vt > Houston > > > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > -- +------------------------------------------------------------------+ | AM Amateur Radio Operator N?DGN | +------------------------------------------------------------------+ | Bob Bethman \\\|/// " The absence of a danger | | \\ ~ ~ // signal does *NOT* mean | | rbeth...@comcast.net (/ @ @ /) that everything is OK " | +-------------------------oOOo-(_)-oOOo----------------------------+ ------------------------------ Message: 3 Date: Tue, 25 Aug 2009 18:26:18 -0400 From: "Brett Gazdzinski" <brett.gazdzin...@verizon.net> Subject: Re: [AMRadio] 100TH and 250TH advice and or comment To: "Discussion of AM Radio in the Amateur Service" <amradio@mailman.qth.net> Message-ID: <71cd31b11af34375befdcb470c705...@brettpc> Content-Type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original I have a modulator that uses four 100TH tubes, it has had the same tubes for the last 25 years, they look clear, and work fine. I have a bunch of spare 100 TH and TL's, all look ok last I looked... I have noticed a bunch of white tubes in the 7 and 9 pin tube stashes, maybe the seals fail, the pins rust, or something happens and the air gets in. You have a lot of thermal cycling on tubes that get used, from cold to very hot, to cold again, but tubes just sitting going bad? Brett ----- Original Message ----- From: "rbethman" <rbeth...@comcast.net> To: "AM Radio List" <amradio@mailman.qth.net> Sent: Tuesday, August 25, 2009 12:06 PM Subject: [AMRadio] 100TH and 250TH advice and or comment > Question: > > I have noticed that the 100THs and 250THS that are in their original > boxes, either not used at all, or maybe use for less than an hour to > test them, seem to be doing fine. > > Their envelopes are crystal clear an can not see any sort of defect. > > Then the ones that are in one of the two BC-610s that has the hours on > it, even though it last performed flawlessly, now appears to have gone > gassy with some milky white inside the envelope. > > Is this perhaps due to over heating or maybe I should phrase this as the > convection cooling of these radios since they do NOT have fans. > > Ideas? Comments? > > It has always been metered and watched with a scope for observing > waveforms, and the wattmeter is the newer Model Bird with peak reading > built-in. (However true they really are!) > > Bob - N0DGN > > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ------------------------------ Message: 4 Date: Tue, 25 Aug 2009 18:53:57 -0400 From: rbethman <rbeth...@comcast.net> Subject: Re: [AMRadio] 100TH and 250TH advice and or comment To: Discussion of AM Radio in the Amateur Service <amradio@mailman.qth.net> Message-ID: <4a946b85.60...@comcast.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Brett, I'm thinking the thermal cycling, a number of years of use that is for the most part intermittent, followed by then sitting for another year and a half has been what broke the back. So long as the intermittent use was a rather regular periodic interval, I was heating them up and getting them full use. I got medical issues that wouldn't let me enjoy the big AM rig, and it sat. I started trouble shooting a problem, and I find the three of them are now gassy. Yet the second radio only got used for about two hours since I got it, (I can only run one at a time. LOL), and it has now sat for over four years AND it has NO gassy tubes. I trying to understand why ONE did and the OTHER did not. Then it could just be those tubes were going anyway. Although I doubt it. They all can in the original Mil issue packaging. It is all strange! Bob - N0DGN Brett Gazdzinski wrote: > I have a modulator that uses four 100TH tubes, it has had the same tubes for > the last 25 years, they look clear, and work fine. > I have a bunch of spare 100 TH and TL's, all look ok last I looked... > > I have noticed a bunch of white tubes in the 7 and 9 pin tube stashes, maybe > the seals fail, the pins rust, or something happens and the air gets in. > > You have a lot of thermal cycling on tubes that get used, from cold to very > hot, to cold again, but tubes just sitting going bad? > > Brett > ------------------------------ Message: 5 Date: Tue, 25 Aug 2009 21:43:19 -0500 (CDT) From: crawf...@surfmore.net Subject: Re: [AMRadio] 100TH and 250TH advice and or comment To: "Discussion of AM Radio in the Amateur Service" <amradio@mailman.qth.net> Message-ID: <1504.208.86.68.20.1251254599.squir...@webmail.surfmore.net> Content-Type: text/plain; charset=iso-8859-1 John Mohn was W5MEU. I remember him talking about that one night over 20 years ago.I have an old 450TL that I want to use. I guess I need to bring it up slowly with a variac feeding the filament transformer to keep the inrush current from wrecking the filament, or is that an issue? Joe W4AAB > I think there is at least some truth to this Lee, but I am not sure of > why. By the same token though I have run 250ths for quite some time and > with many hours of no use both winter and summer without air conditioning. > They seem to always work the same even though I may only fire them up > once or twice a year (much to my dismay). So I really don't have any good > answer for this. If all the tubes in question were assemble into the 610 > at the same time then maybe you could just pass this off as "it was > finally time that the air leak got to them". Don, K4KYV and Tim, WA1HLR > have discussed this sort of thing quite a bit as well as deterioration of > cathode coatings in both directly heated tubes and indirectly heated > tubes. You may want to consult with them about this. One thing is for > certain, if the final tube is weak then it will be very difficult to get > it to produce a wave form output that matches the audio wave form, and it > gets worse as the power demand goes up. > 73 > John > > -----Original Message----- > From: amradio-boun...@mailman.qth.net > [mailto:amradio-boun...@mailman.qth.net] On Behalf Of LEE BAHR > Sent: Tuesday, August 25, 2009 2:20 PM > To: Discussion of AM Radio in the Amateur Service > Subject: Re: [AMRadio] 100TH and 250TH advice and or comment > > John Moan (forgot his call and spelling) (SK) in San Antonio used to run a > few BC-610s. He always rotated his 100TH and 250TH tubes to keep gassing > from forming in them. He had about a dozen BC-610s and around 17 R-390A > receivers in his shack. I think he used to say it was bad to lie them on > their side too. He seemed to know what he was doing and swore the cycling > of the tubes was neccessary to keep them alive. He claimed storing these > tubes would kill them in time. I am only talking about 100TH and 250TH > tubes. > > Lee > w0vt > Houston > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------ Message: 6 Date: Wed, 26 Aug 2009 08:13:58 -0400 From: ronnie.h...@glowbugs.com Subject: Re: [AMRadio] 100TH and 250TH advice and or comment To: amradio@mailman.qth.net Message-ID: <20090826081358.s10fo0snwg08w...@host58.secureserver777.com> Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" This has been an interesting thread to be sure. Gentleman I have 3 450TL's that I got from Geoff a few years ago and I have two used known good 250TH's that I have no use for. I would be willing to trade all 5 for a usable 3-1000Z. The 450TL's are nib box the boxe's are falling to peices. I also have a filament tranny that would work for those 450TL's that I would be willing to throw in. Ronnie - W5SUM Quoting crawf...@surfmore.net: > John Mohn was W5MEU. I remember him talking about that one night over 20 > years ago.I have an old 450TL that I want to use. I guess I need to bring > it up slowly with a variac feeding the filament transformer to keep the > inrush current from wrecking the filament, or is that an issue? > Joe W4AAB > > >> I think there is at least some truth to this Lee, but I am not sure of >> why. By the same token though I have run 250ths for quite some time and >> with many hours of no use both winter and summer without air conditioning. >> They seem to always work the same even though I may only fire them up >> once or twice a year (much to my dismay). So I really don't have any good >> answer for this. If all the tubes in question were assemble into the 610 >> at the same time then maybe you could just pass this off as "it was >> finally time that the air leak got to them". Don, K4KYV and Tim, WA1HLR >> have discussed this sort of thing quite a bit as well as deterioration of >> cathode coatings in both directly heated tubes and indirectly heated >> tubes. You may want to consult with them about this. One thing is for >> certain, if the final tube is weak then it will be very difficult to get >> it to produce a wave form output that matches the audio wave form, and it >> gets worse as the power demand goes up. >> 73 >> John >> >> -----Original Message----- >> From: amradio-boun...@mailman.qth.net >> [mailto:amradio-boun...@mailman.qth.net] On Behalf Of LEE BAHR >> Sent: Tuesday, August 25, 2009 2:20 PM >> To: Discussion of AM Radio in the Amateur Service >> Subject: Re: [AMRadio] 100TH and 250TH advice and or comment >> >> John Moan (forgot his call and spelling) (SK) in San Antonio used to run a >> few BC-610s. He always rotated his 100TH and 250TH tubes to keep gassing >> from forming in them. He had about a dozen BC-610s and around 17 R-390A >> receivers in his shack. I think he used to say it was bad to lie them on >> their side too. He seemed to know what he was doing and swore the cycling >> of the tubes was neccessary to keep them alive. He claimed storing these >> tubes would kill them in time. I am only talking about 100TH and 250TH >> tubes. >> >> Lee >> w0vt >> Houston >> >> ______________________________________________________________ >> Our Main Website: http://www.amfone.net >> AMRadio mailing list >> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ >> List Rules (must read!): http://w5ami.net/amradiofaq.html >> List Home: http://mailman.qth.net/mailman/listinfo/amradio >> Post: AMRadio@mailman.qth.net >> To unsubscribe, send an email to amradio-requ...@mailman.qth.net with >> the word unsubscribe in the message body. >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------ Message: 7 Date: Wed, 26 Aug 2009 11:38:36 -0400 From: "Bernie Doran" <qedconsulta...@embarqmail.com> Subject: Re: [AMRadio] VACUUM TUBES To: "Discussion of AM Radio in the Amateur Service" <amradio@mailman.qth.net> Message-ID: <000701ca2663$46f416e0$8119f...@bernie> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original I am suggesting that anyone with an interest in Vacuum Tubes check the web site CPI :: Eimac click on library and go through the Eimac publications about how to care, design, use, etc for tubes. when you go through these docs, you will know more about vacuum tubes than 99% of the people you talk too. Bernie W8RPW ------------------------------ ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net End of AMRadio Digest, Vol 67, Issue 15 *************************************** ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
