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1. [Amps] 3CX800 Oscillation (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 16 Jul 2009 10:53:58 -0700
I built a 6 meter amp using this tube and put it in a basket case SB200. The result was a very beautiful amp if I do say so myself but it "takes off" with more than a little drive. Has anyone out the
/archives//html/Amps/2009-07/msg00203.html (6,455 bytes)

2. [Amps] SB200 meter shunts (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Fri, 17 Jul 2009 14:43:46 -0700
If someone out there has an SB200 would they please tell me what the values are for the Plate current and Grid current shunt resistors. Tnx N7RT _______________________________________________ Amps m
/archives//html/Amps/2009-07/msg00210.html (6,314 bytes)

3. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 20 Jul 2009 14:14:11 -0700
Years ago we used to tie the screen and control grids together and ground them in 4-1000's. It was very stable but took a lot more drive. Hardy N7RT _______________________________________________ Am
/archives//html/Amps/2009-07/msg00228.html (13,114 bytes)

4. Re: [Amps] spray painting metal (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Fri, 31 Jul 2009 11:21:13 -0700
Notice also that the bottom of a spray can is concave. Pigment collects in the bottom of the can around the edge. Twirl the spray can in a circular motion so the mixing ball does a few laps around th
/archives//html/Amps/2009-07/msg00442.html (9,671 bytes)

5. Re: [Amps] Henry 3K Classic project. (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Tue, 22 Sep 2009 18:04:33 -0700
Don, Inspect the HV wiring. They used wire that dried out to the point that the insulation just fell off. It was the kind of wire that is used today as test lead wire. It has a very soft feel to it.
/archives//html/Amps/2009-09/msg00265.html (9,162 bytes)

6. Re: [Amps] Kenwood TL-922A on 17 meters (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 24 Sep 2009 16:50:19 -0700
Be very careful when trying to use standard amps that were not designed for WARC bands. The plate choke is series resonant around 18 MHz in many amps. I'm not sure the TL-922 configuration but you ma
/archives//html/Amps/2009-09/msg00283.html (7,771 bytes)

7. Re: [Amps] Need bushing (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 5 Oct 2009 19:26:00 -0700
That type of stuff is available through Mouser, DigiKey, Newark, Allied Radio, and I guess other places. It's a common problem 73 Hardy N7RT _______________________________________________ Amps maili
/archives//html/Amps/2009-10/msg00124.html (7,606 bytes)

8. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 12 Oct 2009 23:17:39 -0700
At 2500 ohms reactance of your rfc, the TUNE capacitor probably won't have the range because the rfc is now part of the matching network. And you will go what is wrong with this picture. I have been
/archives//html/Amps/2009-10/msg00190.html (9,369 bytes)

9. Re: [Amps] B- questions (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 9 Nov 2009 19:31:11 -0700
The 1N4007 is actually manufactured as a PIN diode. It is the only one in the 1N400X series that is and I don't know why. I worked at another division for 26 years before I retired. 73 Hardy N7RT ___
/archives//html/Amps/2009-11/msg00156.html (14,520 bytes)

10. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 17 Dec 2009 12:57:13 -0700
There was an article in QST many years ago called "The Stanley Steamer" which described water cooled tubes. I believe ETO built an amp based on a water cooled tube that Eimac made that had 1500 watts
/archives//html/Amps/2009-12/msg00393.html (11,234 bytes)

11. Re: [Amps] which HV connector to use? (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Tue, 12 Jan 2010 23:12:15 -0700
Hi All I have used those Millen connectors for years and never had a problem. Up to 4600 VDC. I am surprised at the complaints..... 73 Hardy N7RT _______________________________________________ Amps
/archives//html/Amps/2010-01/msg00129.html (14,533 bytes)

12. Re: [Amps] which HV connector to use?] (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sat, 23 Jan 2010 22:27:31 -0700
Just for the record, we used RG8 years ago at K6UA's to run high voltage everywhere to each amplifier from one central power supply. Worked fine with SO239/PL259 connectors. The insulation is fine. T
/archives//html/Amps/2010-01/msg00299.html (12,173 bytes)

13. Re: [Amps] Advice: harmonics from Alpha 91B on 160 (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sat, 30 Jan 2010 21:41:59 -0700
I had an Alpha 91B and I am sure it had some harmonic content but I never had a complaint. All amplifiers have harmonics and some more than others due to the exiter, design, and the phase relationshi
/archives//html/Amps/2010-01/msg00554.html (8,154 bytes)

14. Re: [Amps] Fleamarkets and more (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 4 Feb 2010 18:22:10 -0700
Brings back memories. I disagree though on space requirements. When I graduated from college and took my first job in San Diego I rented a two bedroom/two bath apartment in 1972. Since the second bat
/archives//html/Amps/2010-02/msg00114.html (11,443 bytes)

15. Re: [Amps] 120 Hz hum from Henry... (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sun, 21 Feb 2010 21:19:59 -0700
I really kind of miss those days. You could always tell the Russians and the satellite countries with the raspy cw. And then there were the clean cw signals but would drift in frequency. You did not
/archives//html/Amps/2010-02/msg00633.html (12,482 bytes)

16. Re: [Amps] Solid state relays and step start (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 4 Mar 2010 15:02:29 -0700
The last time I checked they were around $120 each in Allied or Newark. Not much demand. Hardy N7RT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2010-03/msg00080.html (10,507 bytes)

17. Re: [Amps] Tuned Input for G-G 50Mhz amp (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sun, 21 Mar 2010 19:35:54 -0700
With that being said, a T network works well with one adjustment on the input. I use one on my 6 meter amp. Remember, you still have that amplifier tube that is going to generate its own distortion.
/archives//html/Amps/2010-03/msg00455.html (10,220 bytes)

18. Re: [Amps] choke - cap filter network in PS (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Tue, 23 Mar 2010 10:00:00 -0700
I think one of the reasons is capacitor technology has come a very long ways since the first Henry amps were made. So the caps available today were not around back then. 73 Hardy N7RT _______________
/archives//html/Amps/2010-03/msg00498.html (8,979 bytes)

19. Re: [Amps] placement of RF choke bypass cap. (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Tue, 23 Mar 2010 16:36:06 -0700
Just maybe a moot point but if I remember my transmission line math correctly, the center conductor and the shield form the boundary conditions for the wave equation so the RF energy in a coax line i
/archives//html/Amps/2010-03/msg00517.html (13,445 bytes)

20. Re: [Amps] gg (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 29 Mar 2010 20:08:49 -0700
You have got to be kidding. I was asked questions like that on the FCC exam. N7RT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2010-03/msg00840.html (9,040 bytes)

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