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Total 541 documents matching your query.

261. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sat, 9 Jul 2005 14:09:06 -0700
For small tetrodes, the safest way to power the screen is through a high-ohm power resistor connected to the anode supply, feeding a shunt V regulator connected in parallel with the screen. This conf
/archives//html/Amps/2005-07/msg00080.html (7,526 bytes)

262. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 11 Jul 2005 08:57:45 -0700
Dick -- Those that use screen potentials of under 800v or so. For tetrodes with handles, shunt screen regulation is do-able but not very practical. cheers Rich Measures, 805.386.3734, AG6K, www.somis
/archives//html/Amps/2005-07/msg00086.html (8,063 bytes)

263. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 11 Jul 2005 09:13:06 -0700
I have never had a case where the 250v-rated 3AG fuse in the primary of the screen supply xfmr failed to open when needed to protect the screen Rich Measures, 805.386.3734, AG6K, www.somis.org ______
/archives//html/Amps/2005-07/msg00087.html (8,815 bytes)

264. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 11 Jul 2005 13:52:34 -0700
... exceeding the 275w max diss. rating during a glitch. ... by stopping the flow of current into the screen PS. - note - Reverse screen-I is handled by a screen-cathode bleeder R which draws c. 30mA
/archives//html/Amps/2005-07/msg00091.html (8,143 bytes)

265. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 11 Jul 2005 17:12:37 -0700
A tube that arcs from the anode to the screen is already a goner, Ian, so there is nothing of value to protect. Common reasons for high dissipation in the screen are loss of load, loss of anode suppl
/archives//html/Amps/2005-07/msg00100.html (9,869 bytes)

266. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 00:13:14 -0700
What condition would make the anode arc to the screen? ... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-07/msg00107.html (8,643 bytes)

267. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 07:18:23 -0700
When load loss happens, the first thing to arc is the Tune-C. The resultant metal-vapour arc reduces the anode potential to a few tens of volts. The bang is not from an arc in a vacuum. In a typical
/archives//html/Amps/2005-07/msg00112.html (12,840 bytes)

268. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 07:29:37 -0700
The operator had a bacon, eggs and beans burrito for breakfast? Consumption of such is known to be especially risky around RF amplifiers. One theory has it that the salt used to cure bacon somehow ma
/archives//html/Amps/2005-07/msg00113.html (13,549 bytes)

269. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 14:26:48 -0700
agreed So electrons don't carry the current in such an arc? okay, but the quantities of trapped gas in all but graphite are quite small. In a vacuum capacitor, the Cu whiskers burn off with no firewo
/archives//html/Amps/2005-07/msg00123.html (12,313 bytes)

270. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 14:31:12 -0700
Peter -- It sounds as if Ian is mixing hole movement in a P-type crystal lattice with what goes on in a vacuum. Rich Measures, 805.386.3734, AG6K, www.somis.org ______________________________________
/archives//html/Amps/2005-07/msg00124.html (9,724 bytes)

271. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 14:44:50 -0700
A healthy 3-500Z typically has a grid-anode withstanding ability of uses a 25kV Tune-C Okay. An 8171. The anode potential is +8kV, the screen potential is +1500V. Screen current is +120mA. However, a
/archives//html/Amps/2005-07/msg00125.html (10,753 bytes)

272. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 14:49:19 -0700
Public discussion of this matter in a respected magazine like *QST* might raise a stink. Better to be safe than sorry. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________
/archives//html/Amps/2005-07/msg00126.html (15,916 bytes)

273. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 14:56:19 -0700
Good logic, Vic. This is why actually operating a new 3-500Z is the only way possible to activate the getter. Applying only filament-voltage for 24-hours to "condition" a 3-500Z is yet another laugha
/archives//html/Amps/2005-07/msg00127.html (9,557 bytes)

274. Re: [Amps] overloading screen TSPA (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 14:58:38 -0700
John -- Have you observed that an anode-screen arc produces reverse screen current? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m
/archives//html/Amps/2005-07/msg00128.html (7,029 bytes)

275. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 12 Jul 2005 15:24:36 -0700
Story adjustment time. - If zirconium gettering takes place at room temperature, then tubes that are stored at room temperature should exhibit less and less leakage -- which is undoubtedly not the ca
/archives//html/Amps/2005-07/msg00130.html (9,175 bytes)

276. Re: [Amps] AL 811 (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 13 Jul 2005 03:16:19 -0700
Hello, Bill -- If you can: follow a schematic, and solder, the circuit on Fig. 7B on my Web site will fill the bill. The T/R speed is c. 2mS, so it's good for up to about 40wpm QSK. For SSB-VOX it is
/archives//html/Amps/2005-07/msg00139.html (8,362 bytes)

277. Re: [Amps] Tetrodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 13 Jul 2005 03:21:40 -0700
That's a terrible thing to say, Randy - even if it is true. cheerz Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2005-07/msg00140.html (12,282 bytes)

278. Re: [Amps] Alpha 86 PIN Diode Fuse (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Thu, 14 Jul 2005 12:36:23 -0700
Vic -- Perhaps you don't have as many thunderstorms? Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://list
/archives//html/Amps/2005-07/msg00158.html (8,008 bytes)

279. Re: [Amps] Drake L4B (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Fri, 15 Jul 2005 13:07:30 -0700
Input SWR of > 1.4:1 typically reduces the power delivered by a solid-state exciter. If the A&Oslash; anode / plate current is under 700mA, not enough drive is arriving at the cathodes of the 3-500Zs
/archives//html/Amps/2005-07/msg00175.html (7,683 bytes)

280. Re: [Amps] Marking Tubes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sun, 17 Jul 2005 02:22:44 -0700
Recording the serial # is another way of keeping track of tubes. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2005-07/msg00187.html (7,345 bytes)

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