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1. [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 20:19:14 -0400; Hello all, I am seeking input on a potential problem with my "almost new" B+ transformer. It is a 240V input, output 4 taps from 2800-3000V rated 2 amp full load. Transformer was tested in situ today; /archives//html/Amps/2008-05/msg00016.html (9,604 bytes)
2. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 20:31:12 -0400; I assumed not since it was built as it is, but that said a dead SB220 HV transformer I pulled apart did indeed have insulated bolts. Should I try doing so, maybe with a teflon tube as opposed to pape; /archives//html/Amps/2008-05/msg00018.html (12,047 bytes)
3. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 20:48:30 -0400; Thanks Dick, I can try that. As constructed the bolts are running thru the same piece of angle aluminum that mounts the transformer to the chassis. As for cap bank I am using six 2watt 220k metal fil; /archives//html/Amps/2008-05/msg00019.html (9,380 bytes)
4. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 22:58:07 -0400; Thanks much for the ideas gents. So far I tried the following: 1.) insulated the core from the chassis with a scrap 1/4" lexan sheet (no bolts just let it sit there) & powered it up with no cap bank; /archives//html/Amps/2008-05/msg00023.html (16,422 bytes)
5. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 23:23:55 -0400; Thanks for the great info Manfred. I didn't get your email until after I sent my latest. I agree 1000%, I can't use it as it is. I think after a few hours running even at idle it would get hot enough; /archives//html/Amps/2008-05/msg00024.html (11,988 bytes)
6. [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Tue, 6 May 2008 16:44:54 -0400; Thanks again for all the advice gents- problem solved. As a FWIW, I tried powering the transformer (no load, caps) with the bolts removed, and of course no heating of the core at all. Next, as an exp; /archives//html/Amps/2008-05/msg00068.html (8,665 bytes)
7. Re: [Amps] AMP TUBES (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Wed, 21 May 2008 22:19:17 -0400; Just curious- my understanding was the RUs are still manufacturing GS35bs- am I wrong on this account? I have a "stock" onhand but am worried they too will become scare if this is the case. FWIW I ha; /archives//html/Amps/2008-05/msg00161.html (8,805 bytes)
8. Re: [Amps] Apples and Oranges (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Tue, 12 Aug 2008 19:42:16 -0400; Methinks you are correct Charles. QRO-parts has the site as mentioned in Aage's email & also sells Russian surplus on Ebay under that name. Having had an email exchange with "QRO-parts" [NOT QRO TECH; /archives//html/Amps/2008-08/msg00080.html (10,021 bytes)
9. [Amps] Checking 8163s (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 11 Oct 2008 17:16:57 -0400; Is it reasonable to test a pair of 3-400s in an SB220 ? If I remember correctly the 3-500 is also a "zero bias" tube - that said, would the slight bias voltage (6.? I forget) in my 220 create a false; /archives//html/Amps/2008-10/msg00057.html (6,385 bytes)
10. Re: [Amps] Checking 8163s (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 11 Oct 2008 21:19:13 -0400; Thanks to all for the responses. Wanted to be sure I gave them a fair test before putting them on the display shelf. They are beautiful, but essentially dead tubes. 73 Dave N3DB _____________________; /archives//html/Amps/2008-10/msg00059.html (8,327 bytes)
11. Re: [Amps] help with corona discharge (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Wed, 12 Nov 2008 13:15:29 -0500; FWIW http://glow.gs35b.com/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2008-11/msg00133.html (12,059 bytes)

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