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References: [ +from:vic@rakefet.com: 418 ]

Total 418 documents matching your query.

321. [Amps] Plate chokes (was: Re: placement of RF choke bypass cap.) (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 24 Mar 2010 08:06:33 -0700
I've been working on a choke for a new amplifier project. I've noticed some things which experienced builders probably already know, but I thought would be worth mentioning: a) Even if the gdo has de
/archives//html/Amps/2010-03/msg00555.html (10,355 bytes)

322. Re: [Amps] Plate chokes (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 24 Mar 2010 14:07:02 -0700
I thought about this. But a choke isn't a high-Q device like a tank coil and there isn't a lot of RF current in it. The shorted turn will reduce the inductance and increase the losses (not a bad idea
/archives//html/Amps/2010-03/msg00577.html (7,598 bytes)

323. Re: [Amps] LCR meter (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 30 Mar 2010 08:49:03 -0700
If the coil has a ferrite or iron core of any kind, the inductance varies a lot with frequency. Inductors with cores must be measured near the operating frequency. And in general, as you raise the fr
/archives//html/Amps/2010-03/msg00873.html (7,570 bytes)

324. [Amps] WANTED -- Plate xfmr, SB-200 or similar (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 30 Mar 2010 09:26:53 -0700
Wanted -- plate transformer, about 900V or 1750V secondary, to deliver about 2200 - 2500 VDC at 400 - 500 ma. 240V primary greatly preferred. An SB-200 transformer would be perfect. Yes, I know Harba
/archives//html/Amps/2010-03/msg00877.html (6,967 bytes)

325. [Amps] pi-net spreadsheet question (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 05 Apr 2010 23:03:33 -0700
I'm using the GM3SEK pi-net design spreadsheet <http://www.ifwtech.co.uk/g3sek/>. It requires that you enter the inductance and resistance used in the parasitic suppressor. What I'm wondering is how
/archives//html/Amps/2010-04/msg00146.html (7,538 bytes)

326. [Amps] Electrolytic capacitor WV ratings (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 06 Apr 2010 18:24:56 -0700
What's considered good engineering practice for electrolytic capacitor voltage ratings at ham power levels? Should you add a safety factor to the DCWV rating of the capacitor, and if so, how much? --
/archives//html/Amps/2010-04/msg00171.html (6,474 bytes)

327. Re: [Amps] pi-net spreadsheet question (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 07 Apr 2010 08:09:51 -0700
Great information, very helpful! This is so much better than trying to figure this out while soldering taps on the coil, cutting tubing, etc. I am also wondering whether I will need parasitic suppres
/archives//html/Amps/2010-04/msg00194.html (14,102 bytes)

328. Re: [Amps] pi-net spreadsheet question (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 07 Apr 2010 15:06:09 -0700
My 813's are matched...by cost. They were free. One that I bought on ebay had an (obviously) broken filament. I'm sticking with the free ones. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______
/archives//html/Amps/2010-04/msg00234.html (8,505 bytes)

329. Re: [Amps] 813's.. Parasitic suppressor's (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 12 Apr 2010 09:31:30 -0700
I was the one that asked. I have to admit that I haven't made a decision as to whether to use GG or grounded cathode. Since I'm planning to run it class C, I will have to lift the grids from DC groun
/archives//html/Amps/2010-04/msg00427.html (11,074 bytes)

330. Re: [Amps] 813's.. Parasitic suppressor's (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 12 Apr 2010 11:01:08 -0700
Is it a traditional grid-driven circuit with a link-coupled parallel-tuned input? Or do you use something else? I'm interested in the input circuit, and in how to get a decent SWR, since I will be dr
/archives//html/Amps/2010-04/msg00429.html (8,877 bytes)

331. [Amps] Series screen gate design help (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 14 Apr 2010 11:29:56 -0700
I want to update the old-fashioned clamp-tube circuit. I want to create a solid-state switch that will accept a voltage input (negative, but it can be inverted) derived from the rectified grid curren
/archives//html/Amps/2010-04/msg00454.html (7,871 bytes)

332. Re: [Amps] Series screen gate design help (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 14 Apr 2010 21:07:16 -0700
If I bias the tube for class C, then the keying envelope will get very sharp. It would be a click generator. What I'm thinking about now is having just enough fixed bias to barely cut the tube off (a
/archives//html/Amps/2010-04/msg00465.html (7,824 bytes)

333. [Amps] Thinking out loud (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 21 Apr 2010 08:39:07 -0700
I'm thinking out loud, I guess it's called brainstorming. Just hit DELETE if it's boring! I already have just about all the parts for my amplifier, which will use a pair of 813's, but before I do too
/archives//html/Amps/2010-04/msg00591.html (8,173 bytes)

334. Re: [Amps] Thinking out loud (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 21 Apr 2010 13:47:26 -0700
A classic! Excellent idea. The pad will also reduce the SWR to the exciter. Thanks, this is simple and will make my life easier. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ____________________
/archives//html/Amps/2010-04/msg00594.html (7,788 bytes)

335. Re: [Amps] Thinking out loud (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 21 Apr 2010 16:00:32 -0700
Nope, somebody else. I am going to document this amp on my website but I haven't done so yet. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _______________________________________________ Amps ma
/archives//html/Amps/2010-04/msg00599.html (7,660 bytes)

336. Re: [Amps] Transformer 50/60hz (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 23 Apr 2010 16:36:49 -0700
Some years ago I built a power supply rated at 2.8 KV 1A. Since I thought I might want to operate it in a 50 Hz. location as well as here in the US, I asked Peter Dahl (who is now an SK) about it whe
/archives//html/Amps/2010-04/msg00629.html (9,866 bytes)

337. Re: [Amps] Calculation of Tube Impedance (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 02 May 2010 07:46:16 -0700
Here are the usual assumptions made for K based on class of operation, which I presume relates to conduction angle: Class A: 1.3 Class AB: 1.5-1.7 Class B: 1.57-1.8 Class C: 2.0 -- Vic, K2VCO Fresno
/archives//html/Amps/2010-05/msg00012.html (7,964 bytes)

338. [Amps] Cleaning air-wound coils (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 02 May 2010 19:36:06 -0700
How do you get the tarnish off of miniductor or airdux-type coils wound with tinned wire? It's hard to get steel wool in between the turns! -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _________
/archives//html/Amps/2010-05/msg00019.html (6,380 bytes)

339. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 23 May 2010 08:30:42 -0700
Regarding the 400 ma rating, I've often wondered why it matters as long as the plate dissipation is not exceeded. The only thing I can think of is the possibility that the filament emissive ability c
/archives//html/Amps/2010-05/msg00326.html (13,923 bytes)

340. [Amps] Bridging 120v loads across HV primary windings (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sat, 29 May 2010 08:05:54 -0700
My amp project power supply has several 120v loads as well as the 240v plate transformer. They include a fan that draws about 100 mA, a screen supply that will take about 350 mA, and a filament trans
/archives//html/Amps/2010-05/msg00427.html (8,047 bytes)

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