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Total 14 documents matching your query.

1. [Amps] Thunderbolt questions (score: 1): Author: willy@global2000.net (Bill Russell); Date: Sun, 07 Apr 2002 08:09:14 -0400; I have a Johnson Thunderbolt hf amp and need to replace the doorknob caps in the output stage. It uses 2 500 mmf at 20kv in parallel. Can I use 2 640mmf as replacements without causing problems. The; /archives//html/Amps/2002-04/msg00222.html (6,590 bytes)
2. [AMPS] Thunderbolt questions (score: 1): Author: willy@global2000.net (Bill Russell); Date: Tue, 06 Nov 2001 06:28:18 -0500; This is my first post to this group and I hope it works! I have a Johnson T'bolt, the hf version and have a few questions. Have not powered it up as yet as it needs a little work. Nothing serious I h; /archives//html/Amps/2001-11/msg00066.html (8,491 bytes)
3. [AMPS] Thunderbolt questions (score: 1): Author: Kenneth D. Grimm, K4XL" <K4XL@arrl.net (Kenneth D. Grimm, K4XL); Date: Tue, 6 Nov 2001 07:11:00 -0500; I would certainly replace the electrolytic capacitors in the screen and bias supplies. I lost one when my T'Bolt was relatively new. Yes, the plate voltage is low and, as I recall, the plate tuning c; /archives//html/Amps/2001-11/msg00068.html (9,723 bytes)
4. [AMPS] Thunderbolt questions (score: 1): Author: 2@vc.net (2); Date: Tue, 6 Nov 2001 04:46:52 -0800; // 2200v is low for 4-400s running SSB. Is it a G-G config., or grid-driven? cheers, Bill - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FA; /archives//html/Amps/2001-11/msg00069.html (8,867 bytes)
5. [AMPS] Thunderbolt questions (score: 1): Author: k2xx@swva.net (Joe Giacobello, K2XX); Date: Tue, 06 Nov 2001 09:01:29 -0500; Bill, I bought my Tbolt used in 1963 and used it for 38 years until I sold it about two weeks ago. It's obviously a quite reliable amp. It will put out about 900 watts at saturation when run in Class; /archives//html/Amps/2001-11/msg00073.html (9,770 bytes)
6. [AMPS] Thunderbolt questions (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 6 Nov 2001 07:38:12 -0800; Be careful of the HV filter cap, Bill. With SS rectifiers, you may exceed its rating. It's likely so old that it needs replacement, anyway, but as I recall, EFJ only used a 2500V oil-filled cap (moun; /archives//html/Amps/2001-11/msg00079.html (10,240 bytes)
7. [AMPS] Thunderbolt questions (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 6 Nov 2001 07:40:58 -0800; Rich, the EFJ T-bolt (2 x 4-400's) is grid-driven and set up for only about 20W drive to run 1kW DC input. If the HV is increased much above 2200V, the filter cap will definitely require replacement,; /archives//html/Amps/2001-11/msg00080.html (10,244 bytes)
8. [AMPS] Thunderbolt questions (score: 1): Author: Kenneth D. Grimm, K4XL" <K4XL@arrl.net (Kenneth D. Grimm, K4XL); Date: Tue, 6 Nov 2001 11:16:51 -0500; built. input Perhaps a wee bit unfair to the MBAs. 8*) Rules? Brings back memories of the endless debates back in the late '50s over the definition of PEP and how you could measure it and whether we; /archives//html/Amps/2001-11/msg00084.html (9,177 bytes)
9. [AMPS] Thunderbolt questions (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 6 Nov 2001 16:27:28 -0000; MBA? Usually means Much Bigger A**! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: ow; /archives//html/Amps/2001-11/msg00086.html (7,987 bytes)
10. [AMPS] Thunderbolt questions (score: 1): Author: 2@vc.net (2); Date: Tue, 6 Nov 2001 09:42:28 -0800; // Amen to that. Meanwhile, in days of yore, AM had a limit of c. 3kW PEP output. FCC rules could be described as Looneytunes. // Amen to that, Ken. Over the years, word slowly trickled out that mor; /archives//html/Amps/2001-11/msg00090.html (9,483 bytes)
11. [AMPS] Thunderbolt questions (score: 1): Author: 2@vc.net (2); Date: Tue, 6 Nov 2001 09:42:30 -0800; // Not all oil-filled capacitors in days of yore used PCBs. General Electric's "Pyranol" caps did. Sprague "Vitamin Q" caps did not. Also, capacitor ratings then tended to be conservative. For examp; /archives//html/Amps/2001-11/msg00091.html (8,438 bytes)
12. [AMPS] Thunderbolt questions (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 6 Nov 2001 09:41:08 -0800; [Steve Katz] The T-bolt, at least the one I had 1969-1975 or so, had a Pyranol cap. It not only failed, it leaked all over the operating bench; but where it was installed it must have run awfully ho; /archives//html/Amps/2001-11/msg00092.html (8,906 bytes)
13. [AMPS] Thunderbolt questions (score: 1): Author: k2xx@swva.net (Joe Giacobello, K2XX); Date: Tue, 06 Nov 2001 12:52:41 -0500; I agree with Steve on all counts. The fan bearings will go without periodic lubrication. Replacement fans can often be found at hamfests though. 73, Joe -- FAQ on WWW: http://www.contesting.com/FAQ/a; /archives//html/Amps/2001-11/msg00093.html (11,121 bytes)
14. [AMPS] Thunderbolt questions (score: 1): Author: 2@vc.net (2); Date: Tue, 6 Nov 2001 11:41:32 -0800; // Agree, however modern electrolytics would reduce the burdensome weight and provide more C. Also, discarding the filter choke would help too - and it would add some sorely needed - for SSB - anode; /archives//html/Amps/2001-11/msg00098.html (8,947 bytes)

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