Mail Archive Search: <+from:2@vc.net>

Results:

References: [ +from:2@vc.net: 2599 ]

Total 2599 documents matching your query.

221. [Amps] MLA2500 power up...... (score: 1): Author: 2@vc.net (2); Date: Sat, 10 Aug 2002 19:47:38 -0700; Yes There 's a short on the +hv. An interlock does not make an amplifier idiot-proof. ur welcome, Blake - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00103.html (8,435 bytes)
222. [Amps] TUBES (score: 1): Author: 2@vc.net (2); Date: Sat, 10 Aug 2002 19:47:47 -0700; good tube. The 4-250A has the same cathode/filament as a 3-500Z, so it will make the same pep on ssb. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00104.html (7,018 bytes)
223. [Amps] filament v (score: 1): Author: 2@vc.net (2); Date: Sat, 10 Aug 2002 20:07:06 -0700; If the pep increases, yes. If the pep does not increase, raising the fil V is wasteful. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00105.html (7,189 bytes)
224. [Amps] Commander-II 144MHz amp PSU woes (and Tempo 2002A) (score: 1): Author: 2@vc.net (2); Date: Sun, 11 Aug 2002 07:43:15 -0700; ** Shorted turns do not show up on an ohm-meter. ** A FWB has advantages and disadvantages over a FWD. ** not the case. However, a FWD requires a transformer with minimal Cu-losses and it needs twic; /archives//html/Amps/2002-08/msg00108.html (11,297 bytes)
225. [Amps] MLA2500 power up...... (score: 1): Author: 2@vc.net (2); Date: Sun, 11 Aug 2002 07:43:07 -0700; ur welcome Sounds like tubes could be the problem. If it blows fuses with the tubes in place, chances are the hv ps is ok. The problem with the tubes could be a leaky seal or gold-sputtering. I auto; /archives//html/Amps/2002-08/msg00109.html (7,297 bytes)
226. [Amps] Commander-II 144MHz amp PSU woes (and Tempo 2002A) (score: 1): Author: 2@vc.net (2); Date: Sun, 11 Aug 2002 18:09:03 -0700; FWB: More efficient transformer possible, less ripple due to ripple cancellation feature. Higher V easier to obtain. Switchable to FWB for RTTY/FM/AØ with spst switch [half-V]. Weather seems; /archives//html/Amps/2002-08/msg00114.html (14,557 bytes)
227. [Amps] Filter (score: 1): Author: 2@vc.net (2); Date: Mon, 12 Aug 2002 17:27:24 -0700; Two separate rods can be used. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00123.html (7,921 bytes)
228. [Amps] Re: bifilar rods (score: 1): Author: 2@vc.net (2); Date: Tue, 13 Aug 2002 19:36:39 -0700; ... ** not a sound wager ** enlightened engineering cheers, Jim - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00128.html (7,064 bytes)
229. [Amps] 6A rectifier diode choice (score: 1): Author: 2@vc.net (2); Date: Wed, 14 Aug 2002 09:53:34 -0700; 1n5408s will do 12A 24/7 in FWB service. An example would be 2, 4cx15.000A/8281's in RTTY service running 12A @10kV=120 big ones. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/me; /archives//html/Amps/2002-08/msg00133.html (7,338 bytes)
230. [Amps] 6A rectifier diode choice (score: 1): Author: 2@vc.net (2); Date: Wed, 14 Aug 2002 10:35:37 -0700; **To do it, one needs to double up the individual diodes. 2, 3A-rated diodes in parallel will dissipate heat better than one 6A diode - provided the pair has an air-gap. Typical I-peak in a C-filter; /archives//html/Amps/2002-08/msg00135.html (8,473 bytes)
231. [Amps] Transformer Noise (score: 1): Author: 2@vc.net (2); Date: Wed, 14 Aug 2002 13:48:15 -0700; Heath hv transformers are potted. My Web site has info on home-potting with fibreglas laminating resin. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00140.html (6,660 bytes)
232. [Amps] LK 500 problem (score: 1): Author: 2@vc.net (2); Date: Sun, 18 Aug 2002 10:09:49 -0700; A grid/fil shorted tube will do this. Lower VHF-Q parasitic suppressors will make the amp more stable -- but with the tradeoff of c. a 2% power out reduction at 29MHz. voltage The filament double-he; /archives//html/Amps/2002-08/msg00154.html (7,885 bytes)
233. [Amps] Changing 3-500z to 8877 (score: 1): Author: 2@vc.net (2); Date: Tue, 20 Aug 2002 16:19:50 -0700; It's a big job. No one at the Rx-end will see the 1/6 S-unit increase. Keep the filament choke. It can be used as the heater-choke for the 8877. (Don't ground one side of the heater. Connect the cat; /archives//html/Amps/2002-08/msg00168.html (7,778 bytes)
234. [Amps] Changing 3-500z to 8877 (score: 1): Author: 2@vc.net (2); Date: Tue, 20 Aug 2002 16:15:26 -0700; It's a big job. No one at the Rx-end will see the 1/6 S-unit increase. Keep the filament choke. It can be used as the heater-choke for the 8877. (Don't ground one side of the heater. Connect the cat; /archives//html/Amps/2002-08/msg00169.html (7,759 bytes)
235. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 05:43:44 -0700; I have seen the open heater phenomenon in kaput 8877s that were used in amplifiers that ran one side of the heater at gnd potential. If you don't have a free supply of 8877s, it might be a good idea; /archives//html/Amps/2002-08/msg00174.html (9,278 bytes)
236. [Amps] Changing 3-500z to 8877 (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 05:43:50 -0700; Good point. Changing a Henry 3k-A to 2, 8877s makes a bit more sense because the power supply is up to the job. However, neither conversion is cost-effective. - R. L. Measures, a.k.a. Rich..., 805.38; /archives//html/Amps/2002-08/msg00175.html (6,964 bytes)
237. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 20:33:29 -0700; ** Ian -- How do you explain that 2, 3-500Z amplifiers have a greater reputation for squirreliness than 1, 3-500Z amplifiers? ** So why did the gold-plating on the 8877's grid boil off in Figure 24; /archives//html/Amps/2002-08/msg00186.html (9,123 bytes)
238. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Wed, 21 Aug 2002 20:33:33 -0700; What is the source, availability, rating and cost of a suitable gaseous clamping device.? What is the failure mode ? Would such a device not fire fire from the RF potential at the cathode ? - R. L.; /archives//html/Amps/2002-08/msg00187.html (9,270 bytes)
239. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 06:39:04 -0700; Squirreliness = marginal VHF/UHF stability. Agreed, however, more feedback-C is hardly good news because it is built into the tube and it is not adjustable. Multi-tube amps also have multiples of th; /archives//html/Amps/2002-08/msg00199.html (11,514 bytes)
240. [Amps] 3-500Z parasitic wows (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 06:39:06 -0700; I too have had stentorian parasites at 110 - 120 MHz with the 3-500Z. However. there is a method to reduce the VHF gain of the tube -- providing one can tolerate a 2% power reduction at 29MHz: That; /archives//html/Amps/2002-08/msg00200.html (9,153 bytes)

Current List: 221 - 240
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]