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1. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 16 Jul 2002 11:19:52 -0700; Not without potential grief. A more rugged and less costly cathode bias configuration is a series string of fwd-biased Si diodes. Each diode = 0.7v. // Also, the dissipation rating for zeners is @ 2; /archives//html/Amps/2002-07/msg00223.html (9,765 bytes)
2. [Amps] Al-80a problem. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 20:51:34 -0700; Or a flock of kamikaze fruit flies could have attacked. - Not according to N7WS' laboratory measurements of 100MHz Q on a HP Z-analyzer. My guess is that if you check the tube @8kV on a high-pot, yo; /archives//html/Amps/2002-07/msg00211.html (9,121 bytes)
3. [Amps] al80a problem (richard) (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 13:48:38 -0700; ur welcome I could send you a kit if u like. You can pay from the invoice. Send adr & we send kit. High-speed switching, step-start. To check for a bent filament helix, one needs a high-potential te; /archives//html/Amps/2002-07/msg00207.html (7,617 bytes)
4. [Amps] PiL Current ratings? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 08:00:18 -0700; The tank circulating current would be the same as the L-section current if the tank Q was c. 6. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00203.html (6,864 bytes)
5. [Amps] PiL Current ratings? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 08:00:16 -0700; Good pont, Dan. Tank current is approximately I-anode x tank operating Q, or typically c. 10Arms. The L section of a Pi-L carries 5.5Arms for 1500W/50-ohms. that - R. L. Measures, a.k.a. Rich..., 805; /archives//html/Amps/2002-07/msg00202.html (7,234 bytes)
6. [Amps] Johnston 226 Roller? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 05:46:30 -0700; They seem to be ok, even though the current rating is only 10A. As I recall, the Johnson 222 (15A) comes in a 0-7uH size. Cardwell/Multronics still makes them. good luck, Greg - R. L. Measures, a.k.; /archives//html/Amps/2002-07/msg00199.html (7,439 bytes)
7. [Amps] WTB: filament choke (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 05:39:34 -0700; For a HF application, a garden-variety 0.5", Mu=125 rod, 3" long can be used to make such a filament choke. #20 gauge Type-WL high-temp electric motor rewinding wire will carry 5A with ease and it ha; /archives//html/Amps/2002-07/msg00198.html (8,290 bytes)
8. [Amps] Al-80a problem. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 05:39:32 -0700; ** I would start by measuring the resistance of the anode's vhf parasitic suppressor's resistor. An increase in ohms of 25% - 400% indicates that vhf energy may have been briefly present -- especial; /archives//html/Amps/2002-07/msg00197.html (9,929 bytes)
9. [Amps] WTB: filament choke (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 14 Jul 2002 13:01:39 -0700; If you put the filament choke in the 240V primary, a 4A choke will do the job. The transformer needs to be insulated from the chassis and the windings need to be RF-bypassed to the core. cheers, Chr; /archives//html/Amps/2002-07/msg00189.html (6,961 bytes)
10. [Amps] Mica Capacitors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 14 Jul 2002 10:23:32 -0700; ** 90pF has 884 ohms of reactance at 2MHz. I=E/R. 3000Vrms/884-ohms = 3.34Arms. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00186.html (7,425 bytes)
11. [Amps] Mica Capacitors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 13 Jul 2002 19:40:02 -0700; WW-2 mica capacitors suffer from moisture absorption and often short. cheers, Guillermo - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00180.html (7,297 bytes)
12. [Amps] Clipperton L buzzy Transformer (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 13 Jul 2002 11:45:26 -0700; Usually the cause is loose screws. Varnishing the laminations first usually helps. // The ultimate fix is to dry the transformer out for 24-hrs at 200ºF and then pot it with polyester laminatin; /archives//html/Amps/2002-07/msg00176.html (7,434 bytes)
13. [Amps] Horizontal 8877 (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 13 Jul 2002 11:44:59 -0700; yes - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00175.html (6,257 bytes)
14. [Amps] TL-922a parts (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 13 Jul 2002 11:35:52 -0700; The last time I heard about 922 parts, they were still being carried by Trio/Kenwood. Did the Plate Current Meter fail? There's article on my Web site about the 922. - R. L. Measures, a.k.a. Rich...,; /archives//html/Amps/2002-07/msg00174.html (6,630 bytes)
15. [Amps] SB-200 power supply (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 12 Jul 2002 18:38:07 -0700; 4000v/leg is plenty of safety factor since the actual piv is c. 3000v/leg. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00168.html (7,209 bytes)
16. [Amps] Defective 8877's ? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 12 Jul 2002 08:52:25 -0700; The heater should be connected to the cathode to prevent a potentially fatal cathode-heater arc during a glitch. When this precaution is taken, a bifilar filament-choke is needed to keep driving RF; /archives//html/Amps/2002-07/msg00161.html (9,826 bytes)
17. [Amps] Bakelite on base of 3-400Z Tubes (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 12 Jul 2002 08:52:23 -0700; To reduce the chance of glass fracture/vacuum-loss when some Turkey rocks the tube sideways during extraction and puts bending stress on the pins. [Amperex tubes do not need this because they use bu; /archives//html/Amps/2002-07/msg00162.html (6,802 bytes)
18. [Amps] Defective 8877's ? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 12 Jul 2002 03:41:00 -0700; According to Dick Ehrhorn, the problem with the 8877's heat dam material existed for a short period. I would try them before I rejected them. What brand of amplifier? - R. L. Measures, a.k.a. Rich...; /archives//html/Amps/2002-07/msg00159.html (6,940 bytes)
19. [Amps] My new Toy. Off Topic & Zippers (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 10 Jul 2002 07:28:27 -0700; This had to be some kind of a joke, Tom. He likes to get spanked? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00148.html (7,708 bytes)
20. [Amps] My new Toy. Off Topic & Zippers. Final. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 10 Jul 2002 07:24:25 -0700; Heat ... reactance? A forum without feedback is like a story without adversaries. . -- i.e., booring. Hows about calling this the AMPS' builders mutual-admiration brotherhood? ... and never is heard; /archives//html/Amps/2002-07/msg00147.html (8,493 bytes)

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