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1. Re: [Amps] Alpha 87A hardfail 99 (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Sun, 26 Feb 2017 07:55:34 -0700; A fault 99 on the 87A means it had six of the same hard faults in a row, the 99 has now locked the amp from coming up. To remedy this one must connect a terminal to the serial port, plug the amp into; /archives//html/Amps/2017-02/msg00193.html (8,057 bytes)
2. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Sun, 26 Feb 2017 08:38:24 -0700; FYI Alpha did produce a water cooled tube amp back in 70' See https://www.alpharfsystems.com/?p=1387 There is probably a good reason they stopped.. W2CO ______________________________________________; /archives//html/Amps/2017-02/msg00194.html (11,411 bytes)
3. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Sun, 26 Feb 2017 10:42:23 -0700; Not sure why, I only started working there 39 years later.. Will ask though. W2CO Sent from my iPad _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2017-02/msg00197.html (10,029 bytes)
4. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 7 Mar 2017 06:48:16 -0700; As the ph goes down, it would be more alkaline, up is acidic. 7.0 is neutral. I would try toyota SLLC (super long life coolant). It seems to last ten years or more in cars... Sent from my iPad ______; /archives//html/Amps/2017-03/msg00067.html (13,025 bytes)
5. Re: [Amps] SS amps watercooling (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 7 Mar 2017 08:22:42 -0700; I stand corrected, was looking at a ph meter which has lower ph as the needle goes higher...duh Sent from my iPad _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2017-03/msg00072.html (8,708 bytes)
6. Re: [Amps] New Amplifier (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Mon, 10 Apr 2017 07:26:25 -0600; Yes the 9500 can do practically instant band changes if the op had stored their user mems properly. If they stored correct tunings in the bands/segments they're using and leave auto off, it can and w; /archives//html/Amps/2017-04/msg00043.html (9,977 bytes)
7. Re: [Amps] rich Richard - tiny antenna (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Mon, 10 Apr 2017 08:59:59 -0600; This idea that everyone needs to have a tuner inline is rediculous it is NOT needed, as a matter of fact the insertion loss of any tuner is in the order of at least a couple db anyway. The homebrew g; /archives//html/Amps/2017-04/msg00049.html (14,192 bytes)
8. Re: [Amps] Tubes, transistors, and 'abuse' (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 11 Apr 2017 08:14:36 -0600; Cathy, I have a tube with handles that actually heats the basement in the winter just idling! I wonder if there's any transistor that can do that? I know one thing, if I ever build a SS amp, it will; /archives//html/Amps/2017-04/msg00063.html (8,933 bytes)
9. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 08:19:37 -0600; Keep in mind the fact that one could have the cleanest amp and even with nfb, alc etc. applied, it still only amplifies whatever is on the input. What goes into also goes out of but now amplified. So; /archives//html/Amps/2017-04/msg00266.html (10,932 bytes)
10. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 15:46:44 -0600; Yes the 9v battery method does work. I was only saying that any amp even at reduced drive levels will amplify the signal and anything else like noise into it. Gozinta gozouta. If that amp has imd pro; /archives//html/Amps/2017-04/msg00284.html (11,803 bytes)
11. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 16:14:17 -0600; It all depends on the transformer specs., a good example is the yaesu FL-7000 which has a transformer designed for 220vac on the primary. Most have 240v service today (ours is consistently 248) so if; /archives//html/Amps/2017-04/msg00285.html (13,972 bytes)
12. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 16:25:13 -0600; That's why I use primarily CW, to this day still the easiest mode for dxing, even with low power and/or a slightly dirty amp it's not until someone goes to slop bucket with that brown rice box...then; /archives//html/Amps/2017-04/msg00286.html (10,865 bytes)
13. Re: [Amps] Ham Tests, was Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Thu, 27 Apr 2017 07:30:25 -0600; Well assuming that you drove up on the accident, then your equipment is still running. But if you were involved in the accident and your mic is broken but you know the code, you could simply use the; /archives//html/Amps/2017-04/msg00329.html (11,608 bytes)
14. Re: [Amps] Ham Tests, was Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Thu, 27 Apr 2017 19:08:32 -0600; Yeah it's ok, let the hillhairy voters bend history to fit their fake agenda, you know something? I have learned a new acronym in these forums in the last week and that is "NFB" talk about NFB with a; /archives//html/Amps/2017-04/msg00357.html (12,677 bytes)
15. Re: [Amps] Ham Tests, was Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Fri, 28 Apr 2017 07:37:27 -0600; This is mostly because of the "removal of the code testing requirements, and the dumbing down of the written tests" for an amateur radio license has left the flood gates open to anyone who can memori; /archives//html/Amps/2017-04/msg00372.html (15,545 bytes)
16. Re: [Amps] LDMOS and DMOS RF MOSFETs (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Thu, 4 May 2017 06:20:51 -0600; Yes there is and that would be the 8877 or otherwise known as 3cx1500a7. It can run from 300-1500 all day with nothing more then some forced air, not water mind you, and depending on the capabilities; /archives//html/Amps/2017-05/msg00051.html (10,354 bytes)
17. Re: [Amps] 8877 filament. (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Thu, 4 May 2017 18:17:48 -0600; And the blower would still need to be on as well, to keep from heat damaging the tube, it will still get hot. Never power a filament with no forced air! Even reduced filament voltage.. Sent from my i; /archives//html/Amps/2017-05/msg00060.html (7,299 bytes)
18. Re: [Amps] new amp race (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 23 May 2017 07:58:13 -0600; Ditto on the yc-156 or better known ,as the 3cx5000A7, it will run on Ep of 3kv and higher, at 25w in you get 1.5kw out, input imp.= 25ohms, even the pulls from the mri world which only down by a db; /archives//html/Amps/2017-05/msg00257.html (11,744 bytes)
19. Re: [Amps] Status of Alpha (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 3 Oct 2017 07:56:14 -0600; Bravo Mike! This needed to come out in the amps forum. When Array Solutions stated that the normal idle current in a 9500 was around 70ma., that was based on the two or three amps they had looked at.; /archives//html/Amps/2017-10/msg00017.html (10,149 bytes)
20. Re: [Amps] Alpha 9500 Relays Needed (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Thu, 23 Nov 2017 06:41:05 -0700; The only problem with using other relays is the fact that they will not fit, the t/r relays in the 9500 are mounted behind the main ctrlr board up against the bulkhead and there's no room for any oth; /archives//html/Amps/2017-11/msg00197.html (10,602 bytes)

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