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221. Re: [Amps] Amp Layout (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Fri, 13 Nov 2015 19:54:45 +0000 (UTC)
Ditto. Jim W7RY does very nice work. His Photo Bucket is now bookmarked. vy 73 es gl,Bryan WA7PRC Date: Fri, 13 Nov 2015 06:43:02 +1300 From: Steve Wright <stevewrightnz@gmail.com> To: amps@contestin
/archives//html/Amps/2015-11/msg00090.html (8,179 bytes)

222. [Amps] Filter capacitor (score: 1)
Author: mike via Amps <amps@contesting.com>
Date: Fri, 13 Nov 2015 18:55:13 -0500
I have a Maxwell capacitor I would like to use in my 8877 power supply. It is marked 36 uf at 6000 volts. Is this good for my 4 kv supply? There has been conversation that some of these are not what
/archives//html/Amps/2015-11/msg00092.html (6,987 bytes)

223. [Amps] filter caps (score: 1)
Author: mike via Amps <amps@contesting.com>
Date: Sun, 15 Nov 2015 11:52:26 -0500
I have a Maxwell capacitor I would like to use in my 8877 power supply. It is marked 36 uf at 6000 volts. Is this good for my 4 kv supply? There has been conversation that some of these are not what
/archives//html/Amps/2015-11/msg00098.html (6,604 bytes)

224. Re: [Amps] Ugly Amps (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Sun, 29 Nov 2015 17:52:12 +0000 (UTC)
I'll contribute! I did have to purchase the GI-7bT tubes, but everything else was from my junque box.  The power transformer is from a parted out Johnson Viking Valiant!  The amplifier puts out 850-w
/archives//html/Amps/2015-11/msg00163.html (8,163 bytes)

225. Re: [Amps] Ugly Amps (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Thu, 3 Dec 2015 04:53:18 +0000 (UTC)
I'll try to do better on the next project!  Glen, K9STH  Website: http://k9sth.net From: Al Kozakiewicz <akozak@hourglass.com> To: "amps@contesting.com" <amps@contesting.com> Sent: Monday, November 3
/archives//html/Amps/2015-12/msg00014.html (7,936 bytes)

226. Re: [Amps] Ugly Amps (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Thu, 3 Dec 2015 04:57:57 +0000 (UTC)
I don't have any problems with the cooling.  Of course, the fan is only about 2-inches away from the tubes.  Glen, K9STH  Website: http://k9sth.net From: Steve Wright <stevewrightnz@gmail.com> To: am
/archives//html/Amps/2015-12/msg00015.html (8,296 bytes)

227. [Amps] Emission numbers (score: 1)
Author: Scott via Amps <amps@contesting.com>
Date: Tue, 12 Jan 2016 20:33:25 -0500
I've looked around the internet without success so I'll try here. Can anyone explain what a good/bad emission number is on a used transmitting tube like an 8877? Or just point me to an explanation? I
/archives//html/Amps/2016-01/msg00006.html (6,659 bytes)

228. Re: [Amps] Emission numbers (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Sun, 17 Jan 2016 08:48:52 -0500
Bill is absolutely right. In addition, keep in mind the cathode current peaks are about three X the average current. So, if you expect to run 1A plate current the cathode has to emit about 3A for the
/archives//html/Amps/2016-01/msg00012.html (8,705 bytes)

229. Re: [Amps] Need for bias switch (CW/SSB) (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Sun, 17 Jan 2016 08:55:52 -0500
Sounds like class B; plate current flows for 180 degrees of the excitation cycle. On the issue of key clicks and class C: Up until mid to late 50's when SSB came along, all of the ham amplifiers were
/archives//html/Amps/2016-01/msg00014.html (9,750 bytes)

230. Re: [Amps] Help please: Converted Alpha 78 blowing fuses (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Sun, 17 Jan 2016 09:02:05 -0500
High/low plate voltage switching is passe . it was done years ago for FCC rule compliance. You should set the amp so that the hi/ lo swich changes the ZSAC instead. . There was NEVER an amplifier tha
/archives//html/Amps/2016-01/msg00017.html (10,245 bytes)

231. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Sun, 17 Jan 2016 13:44:14 -0500
Most likely a tube arc from gas or somehow B+ shorted. It is not stock. It was added. Replace with similar and check frid shunt resistor. Check tubes, one may have shorted. Sent from AOL Mobile Mail
/archives//html/Amps/2016-01/msg00027.html (9,316 bytes)

232. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Mon, 18 Jan 2016 08:50:41 -0500
I also have those resistors if he is out. The original resistors were sort of specialspecial in a way. They are sort of a fuse type. They were used in the Drake L4 B+ line and asasa grid shunt in the
/archives//html/Amps/2016-01/msg00031.html (11,730 bytes)

233. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Mon, 18 Jan 2016 08:59:47 -0500
Very possible and after repair the amp should be brought up slowly on a variac watching the grid current and plate current meters while doing so. Use one tube at a time in the beginning. With each tu
/archives//html/Amps/2016-01/msg00032.html (11,701 bytes)

234. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Mon, 18 Jan 2016 09:04:15 -0500
That probably won't indicate anything so I'd skip that. Most G-F shorts don't show up with ohm meters and gives you false hopes. 99 out of 100 times this is usually true, so use the variac and single
/archives//html/Amps/2016-01/msg00033.html (11,716 bytes)

235. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Mon, 18 Jan 2016 21:11:10 +0000 (UTC)
I replaced RFC2 with a Ohmite pn B20J10RE (10 ohm / 20W) vitreous enamel wirewound resistor. It JUST fits. Bryan WA7PRC That blown resistor may have been underated and blew during a tube arc. The ide
/archives//html/Amps/2016-01/msg00039.html (9,089 bytes)

236. Re: [Amps] Amplifier description? (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Tue, 19 Jan 2016 08:25:24 -0500
Petter, it appears to be a 70cm power amplifier that requires a nominal 2W drive for a nominal 25W output. There is no receive preamp and is specified to have 1 dB of receive loss. 73, Gerald K5GW In
/archives//html/Amps/2016-01/msg00043.html (8,284 bytes)

237. Re: [Amps] Shunt resistors for a bridge made of 6A10 diodes in Alpha 91b (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Thu, 28 Jan 2016 16:58:15 -0500
These avalanche diodes require no shunt resistors or capacitors. Could not be easier than that! 73, Gerald K5GW In a message dated 1/28/2016 3:12:10 P.M. Central Standard Time, vk6vz@arach.net.au wri
/archives//html/Amps/2016-02/msg00002.html (9,491 bytes)

238. Re: [Amps] HV Transformer (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Tue, 2 Feb 2016 17:29:15 +0000 (UTC)
Until I rewound my first xfmr back in the 1980s (HV to LV, 750VA),  I also used to think it was difficult. The most recent rewind was LV  to HV, 4500VA. Being from a medical device, it has a split bo
/archives//html/Amps/2016-02/msg00017.html (8,657 bytes)

239. Re: [Amps] Shunt resistors for a bridge made of 6A10 diodes in (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Wed, 3 Feb 2016 12:15:45 -0500
Avalanche diodes do not need to be identical. The diodes are in series so the reverse leakage current is the same in all diodes. When a diode reaches the avalanche voltage the voltage drop stabilizes
/archives//html/Amps/2016-02/msg00025.html (10,548 bytes)

240. [Amps] NEED SLUG TUNED CEAMIC OIL FORM (score: 1)
Author: wt8r--- via Amps <amps@contesting.com>
Date: Tue, 9 Feb 2016 16:34:49 -0500
1/2" DIAMETER - quantity 9 OR 10 ....... RED SLUG if you have it, but not terribly important. I mostly need the coil form. Thanks in advance to the list for your consideration. Dave, wt8r@aol.com ___
/archives//html/Amps/2016-02/msg00039.html (7,069 bytes)

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