Amps archive search

221. SV: SV: [AMPS] daf thank you (score: 1)

Author: measures@vcnet.com (measures)

Date: Sun, 19 Dec 1999 15:29:16 -0700

? I can measure the average level of distortion during voice modulation in under one minute when I get set up -- provided there is no interference on the adjacent channels. cheers, Lars - Rich..., 8

/archives//html/Amps/1999-12/msg00253.html (7,283 bytes)

222. R: [AMPS] 8877 bias (score: 1)

Author: measures@vcnet.com (measures)

Date: Sun, 19 Dec 1999 15:29:19 -0700

? a Zener diode is not adjustable. A string of forward biased diodes is. cheers, Mauri - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissi

/archives//html/Amps/1999-12/msg00254.html (7,324 bytes)

223. [AMPS] Even More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Sun, 19 Dec 1999 15:29:14 -0700

-22db or so down is what the DAFs measured. Si, Correcto Hardly. AB1 has zero grid current. The DAF runs heavy grid current. ? Duhh ? True enough. The 813 was designed for Class C. ? The gain of an

/archives//html/Amps/1999-12/msg00255.html (11,909 bytes)

224. SV: [AMPS] G2DAF and super cathode (score: 1)

Author: measures@vcnet.com (measures)

Date: Sun, 19 Dec 1999 15:40:24 -0700

? How about arrangin' for a second coming, Ian? cheers. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Admini

/archives//html/Amps/1999-12/msg00256.html (9,338 bytes)

225. [AMPS] Excessive Grid Current (score: 1)

Author: measures@vcnet.com (measures)

Date: Sun, 19 Dec 1999 15:40:28 -0700

? better read the Eimac specs on drive level. 100w is way too much. The max. plate/anode current is rated at 400mA. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contest

/archives//html/Amps/1999-12/msg00257.html (7,759 bytes)

226. R: R: [AMPS] 8877 bias (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 08:36:16 -0700

Above 100 or so mA, there isn't much variation in fwd drop across a diode compared to cathode/grid driving voltage. Zeners exhibit some variation in reverse V-drop as current increases. // The big d

/archives//html/Amps/1999-12/msg00278.html (7,161 bytes)

227. [AMPS] More and More and More and More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 08:36:19 -0700

We are discussing grid driven amplifiers. Normal grid driven linear amplifiers draw virtually zero grid current. GAF amplifiers are grid driven and they draw grid current. When the AB1 amplifier is

/archives//html/Amps/1999-12/msg00279.html (12,366 bytes)

228. [AMPS] Biasing (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 08:50:16 -0700

? Oink, oink!. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contestin

/archives//html/Amps/1999-12/msg00280.html (7,257 bytes)

229. [AMPS] cooling (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 08:50:17 -0700

? Heath invented the best, and quietest 3-500z cooling system ever. See a SB-220. // Observe the cooling fins on the Eimac heat radiator cap. Are they designed for lateral cooling or vertical coolin

/archives//html/Amps/1999-12/msg00281.html (8,017 bytes)

230. [AMPS] More and More and More and More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 11:24:23 -0700

With AB1, no grid current is permitted. With DAF grid current is permitted. When positive grid voltage is permitted, peak anode currents increase substantially. ? Not by DAF rules. By AB1 rules, yes

/archives//html/Amps/1999-12/msg00287.html (10,349 bytes)

231. SV: [AMPS] More and More and More and More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 19:11:19 -0700

For linear operation, gain must remain constant. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrativ

/archives//html/Amps/1999-12/msg00296.html (10,225 bytes)

232. [AMPS] Re: G2DAF (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 19:11:22 -0700

agreed The zener string must have been defective. As Norm's amplifier demonstrated, going from -30db to -22db would necessitate a totally unregulated 0v-350v screen potential plus plenty of grid cur

/archives//html/Amps/1999-12/msg00297.html (7,437 bytes)

233. [AMPS] Re: Dynamic regulation-bias. (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 19:11:21 -0700

For 3-500Zs, the total cathode - grid potential would vary not a lot. The driving potential is close to 115v. What difference would it make if the bias potential shifts from 4.2v at zero drive to 4.

/archives//html/Amps/1999-12/msg00298.html (7,454 bytes)

234. [AMPS] cooling (score: 1)

Author: measures@vcnet.com (measures)

Date: Mon, 20 Dec 1999 19:11:24 -0700

Heath fan-motor bearings are oilite type. If you don't oil the oilite bearings every few years, the fan will eventually slow down and stop. ....... - Rich..., 805.386.3734, www.vcnet.com/measures. -

/archives//html/Amps/1999-12/msg00299.html (7,397 bytes)

235. [AMPS] BeO Cautions (score: 1)

Author: measures@vcnet.com (measures)

Date: Tue, 21 Dec 1999 03:11:13 -0700

Ordinary power transistors have no toxic substances lurking about inside. If you want to meet Jesus sooner rather than later, try drilling through RF power transistors. cheers - Rich..., 805.386.373

/archives//html/Amps/1999-12/msg00310.html (8,658 bytes)

236. SV: [AMPS] More and More and More and More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Tue, 21 Dec 1999 03:11:16 -0700

"I am not a crook". -- Richard Millhouse Nixon. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative

/archives//html/Amps/1999-12/msg00311.html (7,068 bytes)

237. [AMPS] More Plus: Drive derived screen voltage (score: 1)

Author: measures@vcnet.com (measures)

Date: Tue, 21 Dec 1999 03:11:14 -0700

? "shit happens" -- Forrest Gump. ? As I see it, this means something different. To wit: when the screen voltage is adjusted too high for the available drive available in AB1, ZSAC increases unneces

/archives//html/Amps/1999-12/msg00312.html (8,246 bytes)

238. SV: [AMPS] More and More and More and More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Tue, 21 Dec 1999 03:11:15 -0700

? It would have been my guess that DAF would be on a submission and domination trip. mercy! ? The only was I know to deal with S&D freaks is to be very certain of your stuff beforehand, do not parta

/archives//html/Amps/1999-12/msg00313.html (11,363 bytes)

239. SV: [AMPS] More and More and More and More - drive derived screen potential (score: 1)

Author: measures@vcnet.com (measures)

Date: Tue, 21 Dec 1999 03:16:33 -0700

Indeed, Mike, indeed. Rogers on that, good buddy. cheers, Mike - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com

/archives//html/Amps/1999-12/msg00314.html (10,431 bytes)

240. [AMPS] BeO Cautions (score: 1)

Author: measures@vcnet.com (measures)

Date: Tue, 21 Dec 1999 04:07:33 -0700

? I have none. My guess is that one would have to grind the layer just under the drain of an RF power unit. As to the danger of BeO dust. A friend of mine saw a lab demo involving rats. In a couple

/archives//html/Amps/1999-12/msg00317.html (8,635 bytes)