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1. Re: [Amps] Ameritron amp purchase decision questions] (score: 1)
Author: W2XJ <W2XJ@nyc.rr.com>
Date: Fri, 27 Jul 2007 11:41:40 -0400
To a degree you are looking at apples and oranges. The AL 572 uses 4 tubes, the RF parts replacement cost is $144 to $239 -depending on the quality - not $60. The Al 80 Tube cost is $139 to $159 Whil
/archives//html/Amps/2007-07/msg00467.html (9,146 bytes)

2. Re: [Amps] Gassy Tubes/Technology Museum looking for artifacts] (score: 1)
Author: W2XJ <W2XJ@nyc.rr.com>
Date: Fri, 27 Jul 2007 11:42:20 -0400
It was mentioned earlier in the thread that the 7th pin was to prevent 807s from being plugged in by mistake. _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2007-07/msg00468.html (9,451 bytes)

3. Re: [Amps] "Stacking" power supplies?? how? (score: 1)
Author: W2XJ <W2xj@nyc.rr.com>
Date: Tue, 15 Dec 2009 13:43:41 -0500
I would put a diode rated for the current in series with each supply on one side and paralleled on the other. Just be sure the supplies are all set for the same voltage. _____________________________
/archives//html/Amps/2009-12/msg00343.html (8,621 bytes)

4. Re: [Amps] Building 833 Amplifier. Hints and Suggestions? (score: 1)
Author: w2xj <w2xj@nyc.rr.com>
Date: Wed, 17 Mar 2010 10:10:56 -0400
Yes for many years 833s were solid performers in a number of 1KW (output) Am Broadcast transmitter designs. That means at least 4 KW PEP output power or about 5KW pep input. Typical setup two in the
/archives//html/Amps/2010-03/msg00331.html (25,503 bytes)

5. Re: [Amps] Building 833 Amplifier. Hints and Suggestions? (score: 1)
Author: w2xj <w2xj@nyc.rr.com>
Date: Wed, 17 Mar 2010 11:09:41 -0400
I think more likely they have those wattmeter couplers to fulfill DHS and Pentagon contracts. Look at some of the tactical base stations and there amps for them. _____________________________________
/archives//html/Amps/2010-03/msg00339.html (10,058 bytes)

6. Re: [Amps] Why no 28 MHz (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Tue, 25 Jan 2011 23:20:18 -0500
I would respond that the rules have changed and this should not be a concern. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
/archives//html/Amps/2011-01/msg00296.html (9,526 bytes)

7. Re: [Amps] Why no 28 MHz (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Tue, 25 Jan 2011 22:52:26 -0500
probably because they have not updated the design. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2011-01/msg00297.html (8,106 bytes)

8. Re: [Amps] New NXP BLF578XR 1200W LDMOS FET is "indestructible" (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Fri, 22 Jul 2011 12:15:31 -0400
If the device is operated as a class T amplifier, the lower practical frequency limit would be around 40 kilohertz or less. _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2011-07/msg00260.html (9,787 bytes)

9. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 08:27:11 -0700
I agree with Joe Look at the broadcast industry where the TX is usually 24/7 CCS operation. Solid state has replaced tubes on MW up to 2 megawatts in power. ON VHF FM transmitters go to 40 Kw with so
/archives//html/Amps/2012-04/msg00257.html (12,600 bytes)

10. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 12:31:30 -0700
Well, not as flawed as one might think. SS is now less expensive than the almost impossible to find tube TXs. I don't think anyone makes a tube BC TX below 10 KW and you have to go to Eastern Europe
/archives//html/Amps/2012-04/msg00262.html (12,410 bytes)

11. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 18:31:24 -0700 (PDT)
BC band. I do not know the exact power per device but since the newer devices run around a KW, I would say a 100 in a 100KW TX. _______________________________________________ Amps mailing list Amps@
/archives//html/Amps/2012-04/msg00272.html (16,518 bytes)

12. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 18:41:26 -0700
I use an automatic tuner that memorizes frequencies and I can run a THP 2.5K on any frequency without doing anything. The tuner even switches antennas for me. ________________________________________
/archives//html/Amps/2012-04/msg00274.html (9,499 bytes)

13. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 22:22:10 -0700
That is why a good automatic antenna tuner should be used. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-04/msg00279.html (10,093 bytes)

14. Re: [Amps] every db lost re Tubes vs. Solid State (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 23:04:49 -0700
A separate RCV antenna solves that issue which is really not germain to SS vs VT anyway. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2012-04/msg00281.html (12,171 bytes)

15. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Sun, 29 Apr 2012 23:39:15 -0700
With my Palstar it memorizes frequencies via a freq counter and automatically tunes to the correct settings. I 'calibrated' it by doing lower, mid and high for each band. That works out fine. _______
/archives//html/Amps/2012-04/msg00283.html (8,629 bytes)

16. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Mon, 30 Apr 2012 09:52:16 -0700
Look at Palstar. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-04/msg00297.html (11,422 bytes)

17. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Mon, 30 Apr 2012 10:04:23 -0700
Depending on modes used, amps today need to do more than older amps. Back when the power limit was 1 KW input amps had to produce nearly half the power that modern amps do. 1500 W out with RTTY, Cw o
/archives//html/Amps/2012-04/msg00298.html (12,543 bytes)

18. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Mon, 30 Apr 2012 10:29:06 -0700
Paul It was on this board a while back that someone commented that any amplifier built to be on a desk top was not going to be gutsy enough to do constant power modes indefinitely (or words to that e
/archives//html/Amps/2012-04/msg00299.html (13,271 bytes)

19. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Mon, 30 Apr 2012 14:26:00 -0700
It is all about size and weight. A modern SS amp could dispense with the power transformer, though, a reduce both those limitations. _______________________________________________ Amps mailing list
/archives//html/Amps/2012-04/msg00306.html (13,155 bytes)

20. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: W2XJ <w2xj@nyc.rr.com>
Date: Mon, 30 Apr 2012 14:26:42 -0700
Mine runs just fine. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-04/msg00307.html (10,481 bytes)


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