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61. Re: [Amps] Amps with high swr question (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 15 Jan 2015 13:58:34 -0700
But the Caveat to that is you have no control over the loaded Q in an L network. It is a function of load impedances. 73 Hardy N7RT Impedance matching is only one of the functions a tuned input circu
/archives//html/Amps/2015-01/msg00133.html (12,764 bytes)

62. Re: [Amps] Replacing meter bulbs in Command Tech HF-2500 (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 19 Jan 2015 15:14:44 -0700
If you think that's bad, try replacing the 1 meg dropping resistors in the Hi Voltage measuring circuit. After 3 days, I nicknamed the amp "The Amplifier from Hell". I bought the $4 high voltage resi
/archives//html/Amps/2015-01/msg00157.html (9,086 bytes)

63. Re: [Amps] Fan/Filter (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sun, 25 Jan 2015 18:30:05 -0700
I had a 91B and there was an option to get the extra fan which I did. Check with Alpha. Sorry I sold the amp though--one of the better products they produced. IMHO. 73 Hardy N7RT I have an Alpha 91b
/archives//html/Amps/2015-01/msg00286.html (10,040 bytes)

64. Re: [Amps] 3CX1200 tubes (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Tue, 24 Mar 2015 16:41:23 -0700
Hi Dick and everyone. Just an FYI. I have a beautiful Chicago F-725 filament transformer, 7.5 V, 25 amp that will power 3CX1200, 3-1000, and 4-1000 if anyone is needing one. I don't know what they go
/archives//html/Amps/2015-03/msg00062.html (9,813 bytes)

65. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 20 Apr 2015 10:53:18 -0700
I have a used Drake W4 for 6 meters. Picked it up for $40. They are rated to 54 MHz. I went through the cal procedure very carefully using a Coaxial Dynamics 2.5 KW slug for the 2000 watt range. They
/archives//html/Amps/2015-04/msg00132.html (8,536 bytes)

66. Re: [Amps] LK500ZB (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 4 Jun 2015 20:18:47 -0700
Paul, I have experienced much the same thing in all the amps I have used over the years. When amps are new, they perform pretty much up to mfrs specs. A year or so later they begin to go down hill. 7
/archives//html/Amps/2015-06/msg00003.html (7,174 bytes)

67. Re: [Amps] tetrode push-pull amp schematics (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Wed, 17 Jun 2015 19:42:33 -0700
My question too. Don't complicate your life into a divorce.... 73 Hardy N7RT Why would you want to build a push pull amplifier? Single ended is much simpler. 73 Gary K4FMX ___________________________
/archives//html/Amps/2015-06/msg00052.html (11,411 bytes)

68. Re: [Amps] L-C-L vs C-L-C (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 9 Jul 2015 19:08:01 -0700
But the L-C-L also has the capacitor rotor to ground. Therefore, only one adjustment. It has worked well for me using a 3CX800 on 6 meters. Still trying to understand what network you are using. 73 H
/archives//html/Amps/2015-07/msg00024.html (8,427 bytes)

69. Re: [Amps] SB-220 6 meter conversion parasites (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sun, 19 Jul 2015 20:21:00 -0700
Hi All, In my opinion the 2008 article has another glaring mistake, and that is the plate RF choke. It has way too many turns to be inductive at 6 meters. Believe me, about 20 turns of #22 wire will
/archives//html/Amps/2015-07/msg00064.html (10,477 bytes)

70. Re: [Amps] HV transformer and Variac (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Tue, 21 Jul 2015 14:55:24 -0700
Steve, Don't be surprised if you see large swings in plate voltage. A "pole pig" is not designed to be run backwards. It wants secondary current to be low and primary current be very high. I ran one
/archives//html/Amps/2015-07/msg00081.html (8,394 bytes)

71. Re: [Amps] Shunt resistors for a bridge made of 6A10 diodes in Alpha 91b (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Thu, 28 Jan 2016 16:26:30 -0100
Steve, I don't think shunt resistors are needed anymore with today's close manufacturing processes. Someone may have a different opinion. Also, check the leads that supply the filament current. They
/archives//html/Amps/2016-02/msg00000.html (9,412 bytes)

72. Re: [Amps] Anybody remember... KW mobile amp installation (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Fri, 17 Jun 2016 17:39:06 -0400
All, I remember that amp in his trunk. We had a joint meeting of the So Cal and San Diego DX Clubs at some place in Oceanside, CA circa 1971/72. Don wanted to see if we could QSO up the coast on 20 m
/archives//html/Amps/2016-06/msg00067.html (11,933 bytes)

73. Re: [Amps] MFJ-(AMERITRON) ROLLER INDUCTOR? (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Mon, 26 Sep 2016 19:22:26 -0400
Jeff, Don't use a roller inductor. There are no real benefits. The matching boxes I have built with roller inductors are noisey, sound dead until power is applied,--they are a PITA. IMHO. 73 Hardy N7
/archives//html/Amps/2016-09/msg00126.html (9,521 bytes)

74. Re: [Amps] "Conventional" current flow (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sun, 20 Nov 2016 16:25:03 -0500
Bill, So the Heisenberg Uncertainty Principle is still uncertain? I feel it's obvious once the process is measured, the process is changed. The main bang in my bag is gravity. What is it??? 73 N7RT A
/archives//html/Amps/2016-11/msg00082.html (11,928 bytes)

75. Re: [Amps] Stock up on tubes? (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sun, 4 Dec 2016 09:05:12 -0500
IMO the 8877 would be a winner with another 1000 to 1500 volts on the plate. N7RT/4 -- ORIGINAL MESSAGE --(may be snipped) thousands of SB 2nn series Heath amps?? REPLY: If it were my SB 2xx amp I wo
/archives//html/Amps/2016-12/msg00062.html (9,600 bytes)

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