- 1. [Amps] Using 813 tubes on 17 meters and above... (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Sat, 2 Dec 2017 10:12:45 -0500
- I'm getting serious about building an 813 amp as winter project and need some input from other OT's who've played with these tubes on 17 meters and above. Plans are to go with three or four tubes in
- /archives//html/Amps/2017-12/msg00003.html (9,049 bytes)
- 2. [Amps] Toroidal filament choke and DC current (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Wed, 3 Jan 2018 14:51:23 -0500
- I'm building a four tube 813 amplifier and I am planning to use a 240-43 toroid core for the filament choke. I've seen some concerns about core saturation due to the DC cathode current involved in th
- /archives//html/Amps/2018-01/msg00034.html (7,065 bytes)
- 3. Re: [Amps] Amps Digest, Vol 181, Issue 8 (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Thu, 4 Jan 2018 10:34:29 -0500
- That answers a lot of questions... I doubt cathode current would ever reach one amp. So, essentially adding a DC bucking winding is an academic exercise is and not needed, I added the neutralization
- /archives//html/Amps/2018-01/msg00041.html (27,136 bytes)
- 4. [Amps] small chips in Russian doorknob caps (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Fri, 5 Jan 2018 14:34:14 -0500
- I am not versed in the construction of the surplus caps coming from Russia and other eastern Eu. countries... but I do have several that have minor chipped edges due to poor packing. Is this only a c
- /archives//html/Amps/2018-01/msg00050.html (7,667 bytes)
- 5. [Amps] Bird 82A ICAS rating?? (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Mon, 29 Jan 2018 20:32:55 -0500
- These are rated for 500 watts by Bird, but going by the size of the load resistor I'd imagine they are able to handle considerably more power for short periods of time. The Bird 82A manual doesn't gi
- /archives//html/Amps/2018-01/msg00145.html (6,515 bytes)
- 6. [Amps] KPA500 shuts down on initial call (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Wed, 28 Mar 2018 21:17:18 -0400
- My best guess is ALC overshoot. What is the exciter? Is this a new problem that came up with a previously working system, or is it a new setup that has bugs? Pete ____________________________________
- /archives//html/Amps/2018-03/msg00074.html (6,851 bytes)
- 7. [Amps] Amp Warm-up? (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Fri, 6 Apr 2018 15:25:44 -0400
- That amp uses a 3-500Z tube? It should be good to go a few seconds after turn on. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
- /archives//html/Amps/2018-04/msg00008.html (7,035 bytes)
- 8. [Amps] Russian capacitor kbap ratings to current? (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Fri, 4 May 2018 11:42:20 -0400
- I have several 470pF @ 15kV RF doorknob caps that have a 40kbap rating. Seller says the kbap markings are the same as our kvar. How do I calculate the maximum RF current these can handle? Is this the
- /archives//html/Amps/2018-05/msg00004.html (7,864 bytes)
- 9. [Amps] Russian capacitor kbap ratings to current? (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Mon, 7 May 2018 12:17:57 -0400
- Disregard that last question, I was apparently reading something concern three phase reactive current correction when I wrote it. <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm
- /archives//html/Amps/2018-05/msg00010.html (7,936 bytes)
- 10. [Amps] SB220 changing SWR in bypass (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Sat, 29 Dec 2018 18:43:06 -0500
- Where is the SWR meter located in line?? Before, or after the amp??? Pete _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
- /archives//html/Amps/2019-01/msg00002.html (6,692 bytes)
- 11. Re: [Amps] SB-220 tick,tick,tick (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Sun, 20 Jan 2019 18:05:45 -0500
- Check for an open equalizing resistor; sounds like a cap problem. Open resistor can cause that failure in a cap. _______________________________________________ Amps mailing list Amps@contesting.com
- /archives//html/Amps/2019-01/msg00094.html (6,801 bytes)
- 12. [Amps] Measuring IMD in a home workshop (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Mon, 20 May 2019 14:40:03 -0400
- I'm wondering what techniques others are using to make IMD tests for external RF power amps using test gear that would be commonly found in a home workshop. Spectrum Analyzers are cheap enough--I hav
- /archives//html/Amps/2019-05/msg00057.html (6,814 bytes)
- 13. Re: [Amps] Measuring IMD in a home workshop (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Sat, 25 May 2019 11:23:54 -0400
- Unfortunately, the K3 transmitter IMD specs are not good enough for amplifier testing. A two-tone generator is the easiest part of this equation. Not sure what the solution is, a pair of final amplif
- /archives//html/Amps/2019-05/msg00066.html (7,778 bytes)
- 14. Re: [Amps] SB-220 flash over in power supply - Help and results (score: 1)
- Author: Peter Bertini <radioconnection@gmail.com>
- Date: Mon, 16 Dec 2019 09:44:20 -0500
- Hello to the group-- I've also modified a SB-220 for full WARC coverage and 160 meters, to the extent of building up a new bandswitch assembly and using a TU-6 board for the cathode circuit. An Ameri
- /archives//html/Amps/2019-12/msg00031.html (7,513 bytes)
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