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1. [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: Bill Smith <ko4nrbs@yahoo.com>; Date: Wed, 13 Apr 2011 15:23:17 -0700 (PDT); Well thanks to all of you here I have abandoned the idea of using the GU-84B. Staying with a Triode is the way to go. As it sets the amp needs a Tuned Input and a tank circuit refinement if I staye; /archives//html/Amps/2011-04/msg00385.html (10,906 bytes)
2. Re: [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 13 Apr 2011 20:22:27 -0400; Measure the overall height between the 400 and 500 but with the anode cap on the 400 and nothing on the 500. If they come in the same Ameritron sells a cooler that does not extend above the tubes own; /archives//html/Amps/2011-04/msg00389.html (12,520 bytes)
3. Re: [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: Gudguyham@aol.com; Date: Wed, 13 Apr 2011 20:31:53 -0400 (EDT); If you can find PL-175A's they will equal a 3-500Z watt for watt.. Carl, I know you have a few years on me, so when I came on the scene the 3-500's were so popular that the PL-175A tubes were history; /archives//html/Amps/2011-04/msg00392.html (7,218 bytes)
4. Re: [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Wed, 13 Apr 2011 20:57:27 -0400; Hallicrafters sold the HT33A and HT33B which are different iterations of the same amp. They used the PL172/8295A which was a glass/metal external anode pentode with a 1 KW anode dissipation. The anod; /archives//html/Amps/2011-04/msg00393.html (9,115 bytes)
5. Re: [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 13 Apr 2011 21:30:37 -0400; The 4-400 is a tetrode, the PL-175A is a pentode, it has slightly higher output in any configuration. Johnson used both in the T-Bolt Carl KM1H _______________________________________________ Amps ma; /archives//html/Amps/2011-04/msg00397.html (8,546 bytes)
6. Re: [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 13 Apr 2011 22:06:22 -0400; Consider putting a GS-35 in it if you change anything. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo; /archives//html/Amps/2011-04/msg00398.html (14,680 bytes)
7. Re: [Amps] GU-84B Conversion (Re-thought) (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Wed, 13 Apr 2011 20:31:50 -0700 (PDT); The GS-31b is another one to consider. It has a plate dissipation of 1000 watts and they are available from several sources for $48 and $49 each plus $35 shipping. Glen, K9STH Website: http://k9sth.c; /archives//html/Amps/2011-04/msg00400.html (7,984 bytes)

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