Mail Archive Search: <+from:k7fm@teleport.com>

Results:

References: [ +from:k7fm@teleport.com: 769 ]

Total 769 documents matching your query.

201. [AMPS] Stability of Carbon Resistors (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 7 Mar 2000 13:38:31 -0800; This is a multi-part message in MIME format. --=_NextPart_000_0009_01BF883A.6D2CDA80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Years ago I designed a; /archives//html/Amps/2000-03/msg00405.html (12,901 bytes)
202. [AMPS] Static discharge caused arcs (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 9 Mar 2000 19:38:10 -0800; Lightning has been mentioned as a possible cause of arcs - yet almost immediately discounted. I would like to raise the question of whether the dismissal should be quite so quick.. I understand littl; /archives//html/Amps/2000-03/msg00513.html (8,431 bytes)
203. [AMPS] Static discharge caused arcs (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 10 Mar 2000 06:45:28 -0800; There may be a difference between the tv set, vcr and other devices. If the static discharge has the "appearance" of rf, then, after arriving at the coax connector, it will immediately go through a v; /archives//html/Amps/2000-03/msg00541.html (7,807 bytes)
204. [AMPS] Rocky Point effects (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 10 Mar 2000 11:07:12 -0800; That's why 3-500Z's and similar tubes actually gas up and fail when operated too "cold" for extended periods. The key word is "actually". This means that a load of codswallop is quite likely to come; /archives//html/Amps/2000-03/msg00549.html (9,840 bytes)
205. [AMPS] Re: Static discharge caused arcs (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 11 Mar 2000 07:38:53 -0800; Hi Carl: Interesting thought. Probably should not discuss receivers on the Amps Reflector - but it is simply the continuation of an amp related topic. It makes sense to put the rf choke at the output; /archives//html/Amps/2000-03/msg00566.html (8,873 bytes)
206. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 15 Mar 2000 16:49:21 -0800; Not wishing to discuss the G2DAF circuit any further, I still want to question your statement regarding substantial grid current causing distortion. I do not think that is necessarily true. The tube; /archives//html/Amps/2000-03/msg00718.html (10,632 bytes)
207. [AMPS] Re: grid current. (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 15 Mar 2000 21:04:48 -0800; "Eimac makes two tetrodes that are designed to draw grid current in linear service --the 4CX1500B/8660 and the 4CX600J Typical grid current is less than 0.5 mA in either. // Is the data sheet for the; /archives//html/Amps/2000-03/msg00723.html (9,237 bytes)
208. [AMPS] Re: Variable Screen Voltage! (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Mar 2000 06:53:18 -0800; Or if the regulation of the RF drive voltage was poor, or if the grid bias shifted when grid current was drawn. if I think the answer to that is that distortion is reduced in gg because of negative; /archives//html/Amps/2000-03/msg00739.html (12,384 bytes)
209. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 17 Mar 2000 14:57:06 -0800; "Any guesses at to what would happen if a 8660/4CX1500B were used in a DAF circuit. - with say 20mA of grid current instead of 0.06mA of grid current?" Rich: I have heard no one - except you - sugges; /archives//html/Amps/2000-03/msg00790.html (11,083 bytes)
210. [AMPS] Re: Response of Rich (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 17 Mar 2000 19:19:10 -0800; Rich: I raised the question of increasing the screen voltage on a grounded grid tetrode - from zero to something less than the "normal" voltage. Your response was that "DAF circuits produce feculance; /archives//html/Amps/2000-03/msg00793.html (10,594 bytes)
211. [AMPS] Re: Response of Rich (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 17 Mar 2000 20:42:48 -0800; "The screen is never operated above RF ground, either in cathode driven or grid driven service." I have never heard of a screen being being intentionally operated above RF ground - unless it is a Dyn; /archives//html/Amps/2000-03/msg00796.html (7,026 bytes)
212. [AMPS] Tube circuit modeling (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 18 Mar 2000 06:50:34 -0800; Hi Carl: Yes, SPICE would work for tubes as well as transistors. However, it is a lot cheaper to build up a model and test it. Tektronix, right in your back yard, built a marvelous tube curve tracer; /archives//html/Amps/2000-03/msg00801.html (8,678 bytes)
213. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 21 Mar 2000 09:11:40 -0800; "The bottom-line with with the DAF design, is that it is possible to have virtually any screen potential at the grid v peak. . . The grid v varies at an RF rate but the screen v does not - and none o; /archives//html/Amps/2000-03/msg00863.html (11,059 bytes)
214. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 21 Mar 2000 12:39:16 -0800; "Norm's DAF had semi-ok distortion compared to W6CHR's. When CHR had his fired up on 3908KHz, splatter could be heard 100 miles away from 3990KHz to 3805KHz. Is this awesome or what?" How many commer; /archives//html/Amps/2000-03/msg00871.html (9,673 bytes)
215. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 21 Mar 2000 13:27:05 -0800; Rich: In any screen grid amplifier, plate current is determined by the combination of control grid and screen grid voltage. Varying both the control grid and the screen grid certainly makes testing m; /archives//html/Amps/2000-03/msg00872.html (11,908 bytes)
216. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 21 Mar 2000 18:38:24 -0800; Rich: I dislike "attribution marks" and stripped them out. I used quotation marks instead. My Microsoft Outlook Express 5.00.2615.200 is doing exactly what I told it to do. There you go jumping to fa; /archives//html/Amps/2000-03/msg00879.html (9,386 bytes)
217. [AMPS] Hi Pot Transformer (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 21 Mar 2000 20:05:49 -0800; Hi Glenn: Certainly, auto ignition coils will work - but it requires a bit of thought. First, the coil is designed for continuous duty with pulses of short duration. Within that limitation, you can b; /archives//html/Amps/2000-03/msg00883.html (7,583 bytes)
218. SV: [AMPS] Re: New G2DAF amplifier information (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 22 Mar 2000 06:26:39 -0800; "When are one of you DAF enthusiasts going to post the QBL's curves?. My guess is that the QBL curves are quite similar to the 8170 curves. In other words, the QBL's positive grid potential region is; /archives//html/Amps/2000-03/msg00900.html (10,313 bytes)
219. [AMPS] Is screen potential important? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sat, 25 Mar 2000 08:06:43 -0800; Hi Rich: I thought you were against the G2DAF amplifier. Now you go and publish data that supports it! The first part of your statement is incorrect. "Some say that screen potential can wander about; /archives//html/Amps/2000-03/msg00943.html (10,825 bytes)
220. [AMPS] The G2DAF Amplifier; Intents and Purposes (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 26 Mar 2000 10:39:43 -0800; Hi Phil: My answer is: (g) - not sure. G2DAF would be the only person who could properly respond, and he has been on a dx-pedition for years. Unfortunately, the G2DAF amplifier is not of sufficient p; /archives//html/Amps/2000-03/msg00956.html (10,054 bytes)

Current List: 201 - 220
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]