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1. [Amps] 2500 uF at 450V DC for $10.00 each (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Thu Jul 3 09:09:39 2003; Power supplies for SSB service whose current requirements have large peak-to-average ratios usually make use of a capacitor filter system. This simple circuit eliminates the resonant transcients that; /archives//html/Amps/2003-07/msg00019.html (9,146 bytes)
2. [Amps] Information Needed for Shipping Alpha && (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Thu Jul 10 07:47:10 2003; The most fragile items are the ceramic insulators near the parasitic suppressors/blocking cap. area. When the tube/transformer are removed, fill the voids with bubble wrap or something. Tie off the w; /archives//html/Amps/2003-07/msg00058.html (9,258 bytes)
3. [Amps] Alpha 77 turns counter start point (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Sat Jul 12 10:27:47 2003; Tune up into 50 ohm load and set the counter to jive with the number listed in the manual for the frequency in use. (((73))) Phil, K5PC; /archives//html/Amps/2003-07/msg00070.html (7,743 bytes)
4. [Amps] Revisited: Power Combiners, cheap amps. (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Sat Jul 12 10:27:50 2003; An easier and cheaper method is to put up another antenna and feed each one with a seperate amp. OH2BH does this at his contest station. Another beam is cheaper than a combiner unless you have a clos; /archives//html/Amps/2003-07/msg00071.html (9,249 bytes)
5. [Amps] Dual 8877 Alpha 77S final query (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Jul 29 13:32:03 2003; That is the way Alpha does it, Ron. Not necessary. Invest in good step-start and HV glitch protection. (((73))) Phil, K5PC; /archives//html/Amps/2003-07/msg00147.html (7,608 bytes)
6. [Amps] Dual 8877 Alpha 77S final query (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Jul 29 23:01:43 2003; You will need a minimum of 1/4 inch tubing for 20 through 10 meters, and at LEAST plastic, as it will melt. Even the old robust B&W 800 series tank coil assemblies experience plastic coil spacer fai; /archives//html/Amps/2003-07/msg00151.html (7,743 bytes)
7. [Amps] Powering 400w mobile amplifier... (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Jul 29 23:01:45 2003; use feet Most of the installation manuals I have seen for high power amps suggest a maximum of 2-3 foot cable run between battery and amp. I always mount a second battery in a plastic box near the a; /archives//html/Amps/2003-07/msg00152.html (9,267 bytes)
8. [Amps] Re: 160M efficiency (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Jun 3 08:32:52 2003; So how did we get reasonable efficiency in plate modulated 160m PA stages, It was, indeed, Peter. Even the National R-175 chokes found on Johnson and many other amps, including many H.B. projects all; /archives//html/Amps/2003-06/msg00012.html (7,945 bytes)
9. [Amps] G-G Amplifiers With No Tuned Input. (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Wed May 7 08:21:37 2003; . W8JI has always preached against "T" networks in input circuits, but I notice many popular 6 meter amp projects feature one. Has anyone made any IMD comparisons between Pi and T input networks? Is; /archives//html/Amps/2003-05/msg00052.html (8,674 bytes)
10. [Amps] 4pr1000 heater voltage? (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Wed May 7 08:21:40 2003; I use the old Henry trick of installing a 10 ohm slider type power resistor in the primary of the filament transformer. (25 or 50 watts, as required) The proper voltage can be set at the tube pins b; /archives//html/Amps/2003-05/msg00053.html (7,255 bytes)
11. [Amps] Protecting the tubes! (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Sun May 11 09:13:57 2003; This is not the case. RF is fed into a 50 ohm load network composed of C16 L2 and R6. The 8122's produce 20 db gain, increasing the 100mw RF input to 10 watts to drive the pair of 4CX1500B's. The 81; /archives//html/Amps/2003-05/msg00086.html (8,161 bytes)
12. [Amps] Protecting the control grid of a tetrode (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Sun May 11 09:14:00 2003; Simple question: Will application of 20 or 30mW of RF damage the tubes when they are not "ready" ?? It looks like the 8122s can handle a couple watts of grid dissipation each - is this relevant if th; /archives//html/Amps/2003-05/msg00087.html (7,343 bytes)
13. [Amps] 4-1000A Operating position (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Thu May 29 09:34:51 2003; A 4-1000A should not even be shipped nor stored on its side... (((73))) Phil, K5PC; /archives//html/Amps/2003-05/msg00221.html (6,906 bytes)
14. [Amps] Re: 160M efficiency (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Thu May 29 09:34:58 2003; All 160 meter amps need this, Lynn. It is just not as obvious at low power. You need 8000-10000 pf at the base of the plate choke for 160, especially if you are using a string of electrolytic capaci; /archives//html/Amps/2003-05/msg00222.html (6,836 bytes)
15. [Amps] QRO HF-2500DX (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Mon Apr 14 08:09:47 2003; Your guess is correct, it is an un-un (unbalanced to unbalanced) transformer. This allowed QRO to omit those costly RF rated padder capacitors on the low bands, and get away with a lower value C2 in; /archives//html/Amps/2003-04/msg00134.html (7,438 bytes)
16. [Amps] QRO Balun? (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Apr 15 13:45:18 2003; Almost all transmatches and "antenna tuners" built for the last 25 + years have such a transformer; only wired in reverse. No need to re-invent the wheel here. They work fine as long as power limits; /archives//html/Amps/2003-04/msg00156.html (8,517 bytes)
17. [Amps] QRO Balun? (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Apr 15 17:36:22 2003; Your guess is wrong! I have challenged the QRO claims about their products since they came out. Did you not read my posts in the last few days re these products? You are altering my remarks. I NEVER; /archives//html/Amps/2003-04/msg00161.html (8,516 bytes)
18. [Amps] QRO Balun? (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Apr 15 17:52:47 2003; I hardly think so. Not to my knowledge. Well put, Doug! (((73))) Phil, K5PC; /archives//html/Amps/2003-04/msg00162.html (7,300 bytes)
19. [Amps] Mistakes (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Tue Mar 4 14:26:00 2003; Perhaps Sir Thomas Crapper was the first scientist to deal with "gettering" long before tubes were invented, Ian! (((73))) Phil, K5PC; /archives//html/Amps/2003-03/msg00118.html (8,738 bytes)
20. [Amps] Alpha 86 (score: 173): Author: philk5pc at tyler.net (Phil Clements); Date: Wed Mar 5 15:31:26 2003; What/where do we ask for the proper cleaning agent for the switch, Tom? Thanks, Phil, K5PC; /archives//html/Amps/2003-03/msg00202.html (7,676 bytes)

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