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1. [Amps] ACOM-1000 replacing tubes (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Fri, 20 Apr 2007 06:41:03 -0300
I've pretty much talked myself into getting an ACOM-1000. Even with the prices of the 4CX800As increasing, I'm still impressed with this amp. The one reservation is that the manual says, "Replacement
/archives//html/Amps/2007-04/msg00211.html (8,148 bytes)

2. Re: [Amps] ACOM-1000 replacing tubes (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Fri, 20 Apr 2007 16:55:29 -0300
Many thanks to all who replied, both to the list and to me personally. I believe the answer lies somewhere in the middle. Obviously this is partially a liability thing and by putting that disclaimer
/archives//html/Amps/2007-04/msg00220.html (9,634 bytes)

3. [Amps] ACOM1000 TUBE REPLACEMENT INSTRUCTION (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Fri, 20 Apr 2007 17:12:16 -0300
I couldn't find a place to upload files, so here are the instructions as sent to me by two other Hams. These reportedly came from ACOM, so they should be all a person needs. 73, Paul VE!DX == INSTRUC
/archives//html/Amps/2007-04/msg00221.html (18,637 bytes)

4. [Amps] Availability of 4CX800a/GU-74B tubes (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Fri, 20 Apr 2007 17:24:43 -0300
Unfortunately it appears the supply of cheap Russian military surplus 4CX800a/GU-74B tubes has dried up. I did an exhaustive Internet search, and there just do not seem to be any left (other than buy
/archives//html/Amps/2007-04/msg00222.html (7,580 bytes)

5. [Amps] Dumb question (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Mon, 23 Apr 2007 20:09:21 -0300
I see reference to the term/acronym NOS being referred to when discussing tubes. What does NOS stand for? 73/DX Paul VE1DX _______________________________________________ Amps mailing list Amps@conte
/archives//html/Amps/2007-04/msg00238.html (6,968 bytes)

6. Re: [Amps] 230v wiring question (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Tue, 24 Apr 2007 17:20:45 -0300
I am not an electrician, but I wouldn't be concerned about the voltage drop on a 35-foot run of 12-gauge wire. 12 gauge certainly is OK for 240 VAC electric heaters, etc. I'm sure it's good for a lot
/archives//html/Amps/2007-04/msg00268.html (9,140 bytes)

7. [Amps] Does it matter? (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Wed, 25 Apr 2007 18:52:19 -0300
In terms of a typical amplifier - pick one that uses a pair of 3-500z for example; any one - a TenTec Centurion, a Kenwood TL-922, an Ameritron AL-82, etc. Would it make any difference in your maximu
/archives//html/Amps/2007-04/msg00296.html (7,950 bytes)

8. Re: [Amps] sb220 (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sun, 29 Apr 2007 13:38:52 -0300
Does this happen with both tubes (does it matter which one you use when you test it with a single tube?) The obvious answer is that one tube is soft or completely dead, and the other one is good, but
/archives//html/Amps/2007-04/msg00365.html (7,124 bytes)

9. [Amps] Difference between a 4CX800A and a GU74B (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sun, 06 May 2007 22:35:15 -0300
If this has been beat to death before, my apologies for re-asking. I managed to get a Svetlana 4CX800A, and a pair of NOS GU74Bs. I've done a lot of searching on the Internet, and if you poke one int
/archives//html/Amps/2007-05/msg00046.html (7,933 bytes)

10. Re: [Amps] Best deals on amps where? (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Thu, 10 May 2007 16:46:26 -0300
I don't think you'll find anything better than an ACOM-1000. I've never seen a bad review. They are a bit pricey, but so are Alphas . . . 73, Paul VE1DX ______________________________________________
/archives//html/Amps/2007-05/msg00109.html (7,403 bytes)

11. Re: [Amps] off topic but...... (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Mon, 28 Jan 2008 17:42:54 -0400
You need to talk to the Palos Verdes Sundances . . . 73/DX Paul VE1DX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/Amps/2008-01/msg00244.html (7,960 bytes)

12. Re: [Amps] Replacing 811A with 572B (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Wed, 09 Apr 2008 20:45:40 -0300
It's a good move. They are physically and electrically very close. I did it with the AL-811H and instead of going through one or two of those Taylor Chinese clone 811As a month I never had to replace
/archives//html/Amps/2008-04/msg00117.html (7,591 bytes)

13. Re: [Amps] Replacing 811A with 572B (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Wed, 09 Apr 2008 23:47:30 -0300
Agreed. If one just considers the initial cost of the tubes, the 572B alternative is more expensive. Given that you likely will never have to change a 572B in an AL-811H (as opposed to Chinese clone
/archives//html/Amps/2008-04/msg00128.html (9,493 bytes)

14. Re: [Amps] Replacing 811A with 572B (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Thu, 10 Apr 2008 00:23:00 -0300
There are not any really reliable 572Bs, Joe. Trust me. I and many other have looked. The Taylor name was bought out and they are now made China. You can't get an RCA or a CETRON 572B/T160L unless it
/archives//html/Amps/2008-04/msg00130.html (10,315 bytes)

15. Re: [Amps] Transformer Update (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sat, 28 Feb 2009 12:50:59 -0400
Does anyone know if a QRO HF-2500DX works (or can easily be made to work) on 30M? 73, Paul VE1DX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2009-02/msg00710.html (7,372 bytes)

16. [Amps] QRO HF-2500DX on 10.1 MHz (Proper title!) (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sat, 28 Feb 2009 12:52:30 -0400
Does anyone know if a QRO HF-2500DX works (or can easily be made to work) on 30M? 73, Paul VE1DX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2009-02/msg00711.html (6,543 bytes)

17. Re: [Amps] QRO HF-2500DX on 10.1 MHz (Proper title!) (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sat, 28 Feb 2009 13:26:34 -0400
That restriction (in Canada) was removed at least 10 years ago. US stations are still restricted to 200 watts, but our 100 watt limit was removed ~2000. My ACOM-1000 works on 30M, as do most Ameritro
/archives//html/Amps/2009-02/msg00713.html (7,610 bytes)

18. Re: [Amps] QRO HF-2500DX on 10.1 MHz (Proper title!) (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sat, 28 Feb 2009 14:38:39 -0400
I know Don. I was curious if they will technically (or can easily be modified) work on 30M. I realise that there is an unfair FCC (in my view) power restriction on you guys in the US. We are not rest
/archives//html/Amps/2009-02/msg00724.html (8,592 bytes)

19. Re: [Amps] Low Power (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Sun, 01 Mar 2009 20:36:46 -0400
Bill, I can replace the tube(s) in my amp fairy easily, and driving a 1000+ watt amp at 100 watts is just loafing it. However, I can't replace the finals in my PROIII (I have one too.) I'd have to se
/archives//html/Amps/2009-03/msg00037.html (7,485 bytes)

20. Re: [Amps] QRO HF-2500DX on 10.1 MHz (Proper title!) (score: 1)
Author: Paul M Dunphy <amplifier@ve1dx.net>
Date: Mon, 02 Mar 2009 11:52:38 -0400
Thanks to everyone who replied on the reflector and also directly to me. It appears the QRO HF-2500DX is not designed to operate on 30M, is not easy for the end user modify it so that it will, and QR
/archives//html/Amps/2009-03/msg00052.html (7,393 bytes)

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