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Total 31 documents matching your query.

21. Re: [Amps] Plate Impedance, ARRL (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Thu, 27 Apr 2006 14:11:21 +0000
AMEN. Bud, W2RU _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-04/msg00402.html (8,438 bytes)

22. [Amps] SB-220 Plate Tuning Capacitor (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Sat, 03 Jun 2006 23:55:26 +0000
In late 1987 or early 1988, after some months of frequent arcing at my SB-220 plate tuning capacitor (stock P/N 26-131), I ordered a replacement from Heath. In return I received P/N 26-164 and a serv
/archives//html/Amps/2006-06/msg00071.html (9,921 bytes)

23. [Amps] SB-220 Bandswitching (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Sun, 04 Jun 2006 11:37:26 +0000
In my opinion, the former is true -- on *my* SB-220, at least. Peter, I think the problem is compounded by the fact that there's some initial "stiction" when first trying to turn the capacitors. I ju
/archives//html/Amps/2006-06/msg00088.html (10,061 bytes)

24. Re: [Amps] IM distortion and such (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Mon, 26 Jun 2006 20:30:43 +0000
With respect to Tom's first paragraph above: I still have the SB-220 I built more than a quarter of a century ago. I think I've replaced a grand total of one tube in all that time, despite pounding i
/archives//html/Amps/2006-06/msg00466.html (11,513 bytes)

25. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Tue, 04 Jul 2006 02:40:30 +0000
Let's keep in mind that having audio frequency components above 3 kHz doesn't necessarily require us to have a transmitted bandwidth in excess of 3 KHz. That's why we have passband tuning, VBT, and t
/archives//html/Amps/2006-07/msg00161.html (11,747 bytes)

26. Re: [Amps] TL-922 question (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Thu, 27 Jul 2006 00:14:20 +0000
That's exactly the modification I made to my SB-220 once the FCC changed the power limit rules to specify 1500 watts max output on CW. I changed the wiring related to the CW / SSB switch to always ma
/archives//html/Amps/2006-07/msg01201.html (8,310 bytes)

27. Re: [Amps] More information for "What NOT to buy".. (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Mon, 23 Oct 2006 21:56:56 +0000
Interesting comparison. Back in the 70s I chose an SB-220 over an L-4B because the Heath generated less TVI when driven to the same input on CW with the same exciter (Collins 32S-3). That SB-220 is s
/archives//html/Amps/2006-10/msg00256.html (8,472 bytes)

28. Re: [Amps] More information for "What NOT to buy".. (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Tue, 24 Oct 2006 04:31:53 +0000
1. Used the SSB transformer taps on CW. 2. Added a 50-watt 27-volt Zener diode in the filament center tap on CW, to reduce key-up idling current to zero. Heat-sunk the zener to one of the interior al
/archives//html/Amps/2006-10/msg00261.html (11,629 bytes)

29. Re: [Amps] drill bits (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Wed, 01 Nov 2006 00:04:55 +0000
This is not a "drilling steel" question, it's a "drilling aluminum" one. I have a Sears drill press, and can vary the speed, as needed. Can someone tell me how to drill small holes (for pots, 1/8-inc
/archives//html/Amps/2006-10/msg00324.html (7,876 bytes)

30. Re: [Amps] Zener Bias Replacement (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Mon, 06 Nov 2006 18:11:12 +0000
If temperature coefficient of the 6.3 volts is important, you might not want to do that. Bud, W2RU _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2006-11/msg00087.html (7,206 bytes)

31. Re: [Amps] Zener Bias Replacement (score: 1)
Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Tue, 07 Nov 2006 03:40:50 +0000
Jos -- Somebody "cut and pasted" wrong; I did not ask the question below. I was the one who pointed out the diodes would have a negative temperature coefficient. In the "old days", we used to use one
/archives//html/Amps/2006-11/msg00098.html (8,503 bytes)

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