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101. Re: [Amps] TL-922 Replacement Parts (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Thu, 13 Jan 2005 08:42:40 -0800; W0OXJ wrote: Anyone have sources for the 15A line fuses,I can't find these on the web.Also parts for the diode board.I'm afraid to price these from Kenwood based on past experiences. Believe it or no; /archives//html/Amps/2005-01/msg00249.html (7,615 bytes)
102. Re: [Amps] sb220 question after mods (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 16 Jan 2005 08:31:46 -0800; N7uvh@aol.com wrote: Hi guys... Been working on a sb220.. did the rectifer and choke mods. Replaced with Harbah parts. I have noticed that i don't have a idle plate and grid currant. You should never; /archives//html/Amps/2005-01/msg00302.html (7,843 bytes)
103. Re: [Amps] Want to build first amp (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 19 Jan 2005 21:15:10 -0800; Tomm Aldridge wrote: it will be expected to provide service from 160m to 6m. This part is a challenge. You will need to build a tank circuit or circuits that can provide a reasonably low Q on 6 meter; /archives//html/Amps/2005-01/msg00389.html (7,318 bytes)
104. Re: [Amps] High C out (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Fri, 21 Jan 2005 10:49:26 -0800; Dennis12Amplify@aol.com wrote: I believe Chris is talking about converting from a PI network to a Pi-L network. The Pi-L having two levels of impedance matching, and a little more harmonic suppressio; /archives//html/Amps/2005-01/msg00421.html (8,016 bytes)
105. Re: [Amps] High C out (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Fri, 21 Jan 2005 14:49:45 -0800; Dennis12Amplify@aol.com wrote: I agree. He's creating a two stage impedance transformer. OK, we're talking about the same thing. I missed the point of your message, sorry. I just assumed that Pi-L me; /archives//html/Amps/2005-01/msg00435.html (8,136 bytes)
106. Re: [Amps] RF Chokes (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Mon, 31 Jan 2005 08:08:04 -0800; Angel Vilaseca wrote: It is interesting to see that lots of literature have been written about the plate choke and almost none about the output choke. Both chokes are in a circuit with high currents; /archives//html/Amps/2005-01/msg00640.html (8,843 bytes)
107. Re: [Amps] Quick 220 outlet? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Mon, 07 Feb 2005 12:24:53 -0800; John D'Ausilio wrote: Look inside your distribution panel and you'll see that the breakers alternate between legs (which is also how/why 220V breakers work on two adjacent breaker locations). One dif; /archives//html/Amps/2005-02/msg00250.html (8,012 bytes)
108. Re: [Amps] Silly Inductor Question (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 09 Feb 2005 08:15:55 -0800; Angel Vilaseca wrote: Now to obtain .5 mH it will take much more than just one or two turns. To know how many, you will need some way of measuring inductance. Add windings until you reach your target; /archives//html/Amps/2005-02/msg00341.html (7,890 bytes)
109. Re: [Amps] Removing enamel insulation? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 20 Feb 2005 10:21:02 -0800; The usual way it's done with 'modern' enameled wire (possibly not Formvar) is by dipping it in molten solder. A solder pot or the nose of a Hakko 808 desoldering tool works well. Lacking these, a blo; /archives//html/Amps/2005-02/msg00623.html (7,390 bytes)
110. Re: [Amps] [AMPS] Re: FL-2100B Failure (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 22 Feb 2005 13:58:27 -0800; I do not believe that the FL-2100B originally was designed to operate on WARC bands. It's possible that the choke had a resonance near 17 or 12 meters and was burned when the owner attempted to opera; /archives//html/Amps/2005-02/msg00673.html (7,607 bytes)
111. Re: [Amps] Instant-On (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 23 Feb 2005 20:04:06 -0800; I can't prove it, but I'm sure I pushed a 3-500Z over the edge by hitting it with full drive just as the soft-start relay pulled in. After that I always waited at least a few seconds after the click.; /archives//html/Amps/2005-02/msg00712.html (7,389 bytes)
112. Re: [Amps] Instant-On (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Thu, 24 Feb 2005 08:23:35 -0800; More drive was required for a given amount of output, and the maximum output that could be achieved was reduced by about 150 watts. After a week or so I replaced the tube, and behavior was normal aga; /archives//html/Amps/2005-02/msg00738.html (8,109 bytes)
113. Re: [Amps] AL-1500 Circuit Diagram (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 01 Mar 2005 09:08:21 -0800; I'm going to guess. The heater is connected to the cathode and isolated from ground by an RF choke because if it were grounded, then the heater-cathode capacity would reduce the drive available on th; /archives//html/Amps/2005-03/msg00004.html (8,018 bytes)
114. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Fri, 04 Mar 2005 09:06:30 -0800; On first consideration, one might think that the capacitance between the grounded heater and the cathode might shunt some of the drive to ground on the higher bands, making it harder to drive. If thi; /archives//html/Amps/2005-03/msg00055.html (9,299 bytes)
115. Re: [Amps] Alpha 77 Filaments (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Fri, 04 Mar 2005 10:50:56 -0800; Why did isolating the heater improve performance on 160? Or was it done to protect the tubes against a particular failuere...if so, what was the reasoning? Not a challenge, just curious! -- 73, Vic,; /archives//html/Amps/2005-03/msg00065.html (7,021 bytes)
116. Re: [Amps] TL-922 relay problems (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 09 Mar 2005 09:37:33 -0800; Yes. I've had this happen with Jennings RJ1A relays after some use. I've had better luck with Kilovac HC1's. Just anecdotal evidence, not proof. Replace the relay and it should clear up. -- 73, Vic,; /archives//html/Amps/2005-03/msg00239.html (7,955 bytes)
117. Re: [Amps] TL-922 relay problems (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 09 Mar 2005 09:41:31 -0800; Oops, I thought you said it HAD been done! This is the way the vacuum relays tend to fail, but in the case of the stock relay, you might need to clean the receive contacts. The QSK mod is very worthw; /archives//html/Amps/2005-03/msg00240.html (7,205 bytes)
118. Re: [Amps] Alpha -91b Problem (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 13 Mar 2005 12:24:57 -0800; Put a scope on the input and look for overshoot on the leading edges of the dits. I am not sure if the 870 is one of the bad actors in this respect. If it is like the TS850 with a separate power outp; /archives//html/Amps/2005-03/msg00314.html (7,041 bytes)
119. Re: [Amps] Henry 2K Classic X (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 15 Mar 2005 15:18:45 -0800; One thing that will help, in addition to increasing the air gap, is to smooth any sharp points that are at high potential, such as the bandswitch lugs that are connected to the plate side of the tank; /archives//html/Amps/2005-03/msg00349.html (7,407 bytes)
120. Re: [Amps] Henry 2K Classic X (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Thu, 17 Mar 2005 12:47:59 -0800; Absolutely not! The initiation voltage for a corona discharge depends on the charge density. In other words, the sharper the point, the lower the voltage needed to start the corona. I know that switc; /archives//html/Amps/2005-03/msg00392.html (7,724 bytes)

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