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Total 53 documents matching your query.

41. Re: [Amps] Alpha 76PA Conversion - Drive Issue (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 1 Dec 2021 06:43:27 -0700
Thanks. I received this, and a number of similar responses from others. Nobody ever seemed to mention the lower power output in the Alpha 76 3CX800 conversion articles, although AC0C came close. A li
/archives//html/Amps/2021-12/msg00000.html (9,137 bytes)

42. Re: [Amps] Triode Amps (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 2 Dec 2021 08:32:29 -0700
For a jaw-dropping experience, go to https://mfjenterprises.com/collections/ameritron/products/383-0800-a7-2 $2499.95 for a 3CX800. Makes RFParts look like a bargain at $1397.91. The best deal may be
/archives//html/Amps/2021-12/msg00004.html (9,268 bytes)

43. Re: [Amps] Alpha 76PA Conversion - Drive Issue (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 2 Dec 2021 12:13:08 -0700
Those not fretting over .62 dB are also not winning any contests. 73, Steve, N2IC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2021-12/msg00011.html (8,918 bytes)

44. Re: [Amps] Palstar HF-2500E (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 28 Apr 2022 08:09:20 -0600
On the other side of the coin, I have a 2-tube Commander and would love to have a spare 3CPX800A7. I hate to suggest this, but I wonder if VE3HJ's amp would be worth more parting-out ? 73, Steve, N2I
/archives//html/Amps/2022-04/msg00022.html (9,821 bytes)

45. [Amps] Powering NOS 8874's ? (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Tue, 16 Aug 2022 09:05:52 -0600
I know this sort of question has been asked before, but I'll ask again in case there are new insights. I have acquired a NOS 8874 with a date code of 0208 (8th week of 2002 ?). Never even been plugge
/archives//html/Amps/2022-08/msg00016.html (6,449 bytes)

46. [Amps] HF2500 - 15 meter problem (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 24 Aug 2022 16:51:42 -0600
I have a HF2500 with a pair of 3CPX800's. It's been a great amp. Up until now, it's had a minor issue. The tuning/loading drifts of 15 meters as it heats up. Not a big deal - just a small tweak of th
/archives//html/Amps/2022-08/msg00028.html (7,345 bytes)

47. Re: [Amps] HF2500 - 15 meter problem (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 24 Aug 2022 18:35:03 -0600
Well, it looks like it really is the plate choke. It became obvious with the last test. See https://www.kkn.net/~n2ic/melted_choke.jpg Where do I get a new plate choke, or at least a new delrin form
/archives//html/Amps/2022-08/msg00031.html (10,901 bytes)

48. Re: [Amps] HF2500 - 15 meter problem (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 24 Aug 2022 19:08:37 -0600
It's a Command Technologies, HF-2500M. The way they have the 3CPX800's mounted, there isn't room for the RFParts choke without some modifications 73, Steve, N2IC _____________________________________
/archives//html/Amps/2022-08/msg00033.html (14,053 bytes)

49. Re: [Amps] B&W PT2500 (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Sat, 27 Aug 2022 08:22:55 -0600
You are correct - the PT-2500 has a pair of 3-500Z's. It was designed and built in the era when the USA power limit was 1000 watts DC input. Hence, the HV is not high enough for 1500 watts output, re
/archives//html/Amps/2022-08/msg00044.html (12,335 bytes)

50. Re: [Amps] B&W PT2500 (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Sat, 27 Aug 2022 09:51:16 -0600
With the Commander down, this seemed like a good time to fire up the PT-2500A. It's the B&W version. 20 meters: Standby Vp = 3300 volts Loaded Vp = 2800 volts Ig = 250 mA Ip = 760 mA Po = 1180 watts
/archives//html/Amps/2022-08/msg00050.html (16,324 bytes)

51. [Amps] Noisy relay (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Sun, 11 Dec 2022 09:39:30 -0700
Commander HF-2500.. Every time the T/R relay goes back to receive, I'm getting a pretty big RF spike that I can hear in the receiver. This has nothing to do with the transceiver hot switching or RF s
/archives//html/Amps/2022-12/msg00027.html (6,465 bytes)

52. [Amps] Actuating a 120 VDC relay with low voltage (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Mon, 26 Dec 2022 15:04:19 -0700
I have an old PT-2500A with a 120 volt relay. Modern radios don't like such a high voltage on their PTT circuit. Can someone point me to a circuit that will allow control of the 120 volt PTT relay wi
/archives//html/Amps/2022-12/msg00111.html (7,563 bytes)

53. [Amps] Measuring PT-2500A High Voltage (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 28 Dec 2022 08:51:18 -0700
First, thanks for the suggestion/schematics for low voltage PTT. I have that working now. Seems like the HV on my PT-2500A might be low. The meter shows only 2700 volts in standby. But how do I know
/archives//html/Amps/2022-12/msg00125.html (7,468 bytes)

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