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Total 15 documents matching your query.

1. [Amps] Antique 304TL Amp (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sat, 02 Oct 2004 09:18:37 -0400
I'm helping a friend dispose of some of his gear since he is no longer able to operate his station. One piece is a 6' rack of 304TL amps. One single tube RF deck, two push-pull RF decks (2 tubes each
/archives//html/Amps/2004-10/msg00010.html (7,607 bytes)

2. Re: [Amps] Pin Diodes (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Thu, 09 Mar 2006 12:31:25 -0500
W0UN: active ham. I forget the spec on lifetime but it is was something like 1 or 2 million cycles. At one point (a decade or more ago) I did the calculations that showed that a VERY active CW contes
/archives//html/Amps/2006-03/msg00233.html (8,579 bytes)

3. Re: [Amps] 160 m antenna swr (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sat, 24 Mar 2007 09:57:34 -0400
limits how much power we can feed to about net 800 watts (forward 1050-ref 250 w). Alex I have heard and worked V47KP many times on 160. In my opinion your TX signal is superb as is and is already on
/archives//html/Amps/2007-03/msg00325.html (7,355 bytes)

4. [Amps] FS: 3 Eimac 8874 3CX400A7 Tubes (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Wed, 27 Feb 2008 17:08:56 -0500
I'm converting my backup Alpha 76PA to 3CX800A7 and am selling these Eimac 8874s. With 70W input they give full 1500W out on 20m using my Mirage MP-1 Wattmeter. They have never been abused (I always
/archives//html/Amps/2008-02/msg00199.html (7,043 bytes)

5. [Amps] FS: Mod to extend Alpha 76 series tube life (score: 1)
Author: "Bill Tippett" <btippett@alum.mit.edu>
Date: Sat, 1 Mar 2008 20:02:24 -0500
This mod by AF6S was originally published in the September 1989 issue of The DX Magazine. It limits inrush current to the three 8874 tubes by adding a thermistor, relay and associated parts. I'm sell
/archives//html/Amps/2008-03/msg00005.html (7,393 bytes)

6. [Amps] Source for MDC HV caps (score: 1)
Author: "Bill Tippett" <btippett@alum.mit.edu>
Date: Sat, 3 May 2008 19:25:09 -0400
I have an Amp Supply amp which uses 1000 pF 5 kV MDC ceramic caps in several places. I've now used my last one and wonder if anyone knows a source for these. Would like to have a few spares "just in
/archives//html/Amps/2008-05/msg00013.html (6,930 bytes)

7. [Amps] Source for MDC HV caps (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 04 May 2008 06:46:47 -0400
Just a quick follow-up on this. I couldn't locate a source for the MDC caps but both RF Parts and Newark had equivalents. Just a plug for Newark...they have one of the easiest-to-use websites for fin
/archives//html/Amps/2008-05/msg00026.html (6,781 bytes)

8. Re: [Amps] Doorknob quality (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 22 Feb 2009 08:57:32 -0500
PA2KW: capacitor (so within the tuning circuit) I "cooked" already two of these (different) doorknobs in just a few minutes. You'll do better to use 3X 100 pF in parallel or even 6X 50 pF. I had a te
/archives//html/Amps/2009-02/msg00644.html (7,912 bytes)

9. Re: [Amps] 3CX800 and blower (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Mon, 07 Sep 2009 13:17:10 -0400
The answer to your question, and the only way to be sure is to measure the temperature of the metal-to-creamic seals and make sure they do not exceed 250 degrees C. Does anyone have any idea how this
/archives//html/Amps/2009-09/msg00075.html (7,351 bytes)

10. Re: [Amps] 3CX800 and blower (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Mon, 07 Sep 2009 13:57:33 -0400
and make sure they do not exceed 250 degrees C. I found the following in a March 2001 RadCom review of the Acom 2000/1000 by Peter Hart: "When the exhaust temperature reaches 90deg C, which it can t
/archives//html/Amps/2009-09/msg00076.html (8,269 bytes)

11. Re: [Amps] 3CX800 and blower (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Tue, 08 Sep 2009 07:08:33 -0400
W6WRT REPLY: seals vs how much contacts the rest of the tube, especially the anode. Every physical layout is going to have a different answer. should be good enough. FYI I've learned the following a
/archives//html/Amps/2009-09/msg00085.html (8,500 bytes)

12. Re: [Amps] 2000Vct 1.5KVA Toroid Tube Transmitter Amp Transformer (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 18 Apr 2010 16:54:41 -0400
FYI that transformer looks similar to one in Elecraft KPA500 solid state amp (announced at Visalia). http://s263.photobucket.com/albums/ii156/n6tqs/visalia/?action=view&current=IMGP0037.jpg 73, Bill
/archives//html/Amps/2010-04/msg00547.html (6,748 bytes)

13. Re: [Amps] Time delay problem with an ALPHA 76 CAE (3tubes). (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sat, 13 Dec 2014 09:00:32 -0500
Bon Jour Herik! As someone stated the problem is probably C109 (22 uF, 20V) on the HV & Control PCB. With R120 this RC delay circuit controls the time delay. If your actual delay is less than 3 minut
/archives//html/Amps/2014-12/msg00052.html (7,682 bytes)

14. [Amps] OT for KM1H (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Wed, 21 Jan 2015 15:48:06 -0500
Carl please contact me via phone or email. I cannot seem to reach you via either so maybe my email is somehow being blocked. Thanks! Bill W4ZV P.S. Apologies to all but I know Carl is apparently rece
/archives//html/Amps/2015-01/msg00197.html (6,378 bytes)

15. [Amps] Fwd: OT for KM1H (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Thu, 5 Feb 2015 18:30:51 -0500
Carl please call or email me ASAP! 73, Bill W4ZV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-02/msg00070.html (8,142 bytes)

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