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Total 406 documents matching your query.

181. Re: [Amps] Pi-L Network Question (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 11 Mar 2014 09:59:31 -0700
The TL922 I have would not load properly at 1810 kHz without adding capacity. Although now it works, it is less efficient than on other bands and it probably should have more inductance. I couldn't f
/archives//html/Amps/2014-03/msg00039.html (12,438 bytes)

182. Re: [Amps] Pi-L Network Question (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Tue, 11 Mar 2014 14:13:59 -0700
Interesting. This one does have the HV. The Japanese model of the TL-922 does not go into the SSB Hi voltage mode. If you want more power out of it you need to go in and connect up the HI tap on the
/archives//html/Amps/2014-03/msg00044.html (9,436 bytes)

183. Re: [Amps] SHV Connectors and B- (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Thu, 13 Mar 2014 08:39:37 -0700
What I did in my tetrode amp was to put an 0.25 ohm 50 watt resistor in the power supply box between the negative output of the power supply and ground. This was clamped with 6A10s both in the power
/archives//html/Amps/2014-03/msg00072.html (12,879 bytes)

184. Re: [Amps] 8877 input Z (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Fri, 28 Mar 2014 11:00:57 -0700
You can design the input circuit as a pi-section lowpass filter with a cutoff above the highest band (I used 32 MHz). You can use standard tables for a 50-ohm input/output impedance because 54 ohms i
/archives//html/Amps/2014-03/msg00178.html (8,687 bytes)

185. Re: [Amps] 3-500Zs inverted (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Thu, 03 Apr 2014 13:38:50 -0700
No problem, just readjust the neutralization. Its only in balance at the equator -- Original Message -- From: "RMorris" [1]<robrk@nidhog.net> To: "Carl" [2]<km1h@jeremy.mv.com> Cc: "Pete Smith N4ZR"
/archives//html/Amps/2014-04/msg00033.html (10,029 bytes)

186. Re: [Amps] antenna analyzer. (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Sat, 05 Apr 2014 20:38:56 -0700
The method requires that you know the input and output impedances of the the tube (I think you are talking about tube amplifiers?) Then you put non-inductive resistors of the appropriate values in pl
/archives//html/Amps/2014-04/msg00062.html (8,601 bytes)

187. Re: [Amps] ALS-600 vs ALS-1300 (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Thu, 10 Apr 2014 09:30:20 -0700
First, I agree with W6WRT. For DXing, especially on 80/160m, you should have a legal limit amplifier. If you want to operate RTTY or AM, you also want one that can do it for a long period of time wit
/archives//html/Amps/2014-04/msg00122.html (9,941 bytes)

188. [Amps] Eimac 3-500Z date codes (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Tue, 29 Apr 2014 16:23:13 -0700
I know this information has appeared here, but I haven't been able to find it. Which are the "bad" Eimac 3-500Z date codes? I have a pair that appear to be unused that have the code 8240. Does this m
/archives//html/Amps/2014-04/msg00253.html (7,193 bytes)

189. Re: [Amps] Eimac 3-500Z date codes (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Tue, 29 Apr 2014 18:34:59 -0700
I've seen the ones with the weld problem! If they will hold the low voltage (CW) position of the TL922, then I can getter them. There was a run of them in the 80s that had the welds break where the c
/archives//html/Amps/2014-04/msg00256.html (8,148 bytes)

190. Re: [Amps] 3-500Z pin comes unsoldered (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Tue, 13 May 2014 12:52:11 -0700
You probably know this, but the clips get weak when they overheat. So it's not enough to tighten it up, but you should replace it. You can switch it with one of the clips on the grid pins. Before I o
/archives//html/Amps/2014-05/msg00080.html (7,612 bytes)

191. Re: [Amps] LK-500 ZB problem (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Wed, 28 May 2014 19:09:44 -0700
Mike, I can't answer most of your questions, but in general the most likely cause of vacuum relay failure is hot-switching. This could be due to the design of the amplifier, or the transceiver used t
/archives//html/Amps/2014-05/msg00136.html (8,106 bytes)

192. [Amps] FS: Collins offset center meter - unused (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Tue, 17 Jun 2014 16:01:32 -0700
I have an unused Collins meter, I believe for the 30S-1. It has two scales, 2-0-5 and .4-0-1.0, part no. 458-0483-000. It looks in perfect condition. $65 shipped conus. -- 73, Vic, K2VCO Fresno CA ht
/archives//html/Amps/2014-06/msg00041.html (6,621 bytes)

193. Re: [Amps] Henry 3k Filament transformer taps (score: 1)
Author: "Vic, K2VCO" <k2vco.vic@gmail.com>
Date: Mon, 08 Sep 2014 07:27:01 +0300
Remember that you need to measure the voltage under full load. On 9/8/14 2:09 AM, glenn riccio wrote: Hello all you henry radio amp owners. I just bought a Henry 3k filament xfrmer off the internet.
/archives//html/Amps/2014-09/msg00003.html (8,297 bytes)

194. Re: [Amps] Henry 3k Filament transformer taps (score: 1)
Author: "Vic, K2VCO" <k2vco.vic@gmail.com>
Date: Tue, 09 Sep 2014 07:07:10 +0300
I am not familiar with this particular transformer. But if you are drawing 21 amps and the voltage is still 8.75v then either 1. You are using the wrong taps. 2. Your line voltage is high. 3. The tra
/archives//html/Amps/2014-09/msg00010.html (10,352 bytes)

195. Re: [Amps] Amp Supply LK500ZB - strange failure mode (score: 1)
Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>
Date: Fri, 03 Oct 2014 08:24:25 +0300
I've run into a number of Eimac 3-500Zs that developed filament to grid shorts. Often they test OK when cold. On 10/3/2014 05:16, k0zx Rich wrote: Turned out after pulling and swapping the tubes it p
/archives//html/Amps/2014-10/msg00010.html (8,816 bytes)

196. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Wed, 29 Oct 2014 09:16:11 +0200
I believe the difference between the 1w grid dissipation rating of the 1500 and the 0w of the 1000 isn't significant and may only be a matter of how the engineers decided to present it on the data sh
/archives//html/Amps/2014-10/msg00235.html (9,214 bytes)

197. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Thu, 30 Oct 2014 08:15:53 +0200
If you look at the characteristic curves on the datasheet, you can see that it is a different tube. I wonder whether the 4CX1500B is _intrinsically_ a low distortion tube, by any special construction
/archives//html/Amps/2014-10/msg00247.html (8,627 bytes)

198. Re: [Amps] Long stored SB-220 (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Tue, 25 Nov 2014 08:32:32 +0200
It certainly wouldn't hurt to remove the tubes and bring it up on a variac to reform the capacitors. The best thing to do with the tubes is to build a device that will let you apply a variable plate
/archives//html/Amps/2014-11/msg00045.html (8,567 bytes)

199. Re: [Amps] Holding a vacuum (score: 1)
Author: Vic Rosenthal <k2vco.vic@gmail.com>
Date: Fri, 28 Nov 2014 20:06:17 +0200
Yes, you MUST pass air through the socket to cool the seals whenever heater voltage is applied! Vic k2vco/4x6gp Sent from my phone _______________________________________________ Amps mailing list Am
/archives//html/Amps/2014-11/msg00063.html (11,157 bytes)

200. Re: [Amps] AL-82 (score: 1)
Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
Date: Sat, 13 Dec 2014 18:34:56 +0200
By all means, replace them. All that heat is power that would otherwise be transmitted. If the resistors actually are falling apart, the amplifier might become unstable. The originals are fine. There
/archives//html/Amps/2014-12/msg00055.html (7,575 bytes)

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