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121. Re: [Amps] Which hearhkit amp would you choose? (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Tue, 12 Apr 2011 21:39:50 -0700 (PDT); The 200, 201, 220, or 221. All are very good Heathkit amplifiers. Don't even think of an SB-230 unless you are willing to change out the 8873 conduction cooled tube which hasn't been made for decades; /archives//html/Amps/2011-04/msg00353.html (8,007 bytes)
122. 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)
123. Re: [Amps] Roller Inductor Choices (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 14 Apr 2011 20:37:28 -0700 (PDT); Make sure that the GI-46b tubes have the heat sinks. They are sold both ways and with heat sinks are a "bit" more. Glen, K9STH Website: http://k9sth.com I plan on using a roller inductor with two GI-; /archives//html/Amps/2011-04/msg00435.html (7,422 bytes)
124. Re: [Amps] Roller Inductor Choices (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 15 Apr 2011 08:08:23 -0700 (PDT); I recently built a 160-meter only amplifier using a pair of GI-7bT tubes. It was easy to make a socket for them starting with one of the $2.99 aluminum mini-boxes that are sold at Radio Shack. The ca; /archives//html/Amps/2011-04/msg00440.html (8,346 bytes)
125. Re: [Amps] Roller Inductor Choices (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sat, 16 Apr 2011 07:33:14 -0700 (PDT); The fan that I used came out of an industrial 13.560 MHz amplifier which used an 8877. It does move some air! However, it isn't that loud. I positioned the fan so that it blows across the entire tube; /archives//html/Amps/2011-04/msg00458.html (8,548 bytes)
126. Re: [Amps] Picture tubes (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Wed, 11 May 2011 15:29:41 -0700 (PDT); They float! At least all of those that a guy who owned a garage TV shop down the block from my parents house took down to the river and used for target practice with a .22 calibre rifle did. Now this; /archives//html/Amps/2011-05/msg00062.html (10,027 bytes)
127. Re: [Amps] PA efficiency (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Wed, 18 May 2011 12:01:48 -0700 (PDT); The GS-31b and the GS-35b are the same tube except for the heat sink which "screws" on. You can remove the heat sink from the GS-35b and put it on the GS-31b and then the GS-31b will have 1500 watts; /archives//html/Amps/2011-05/msg00152.html (7,967 bytes)
128. [Amps] GS-35b heat sink (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 19 May 2011 20:21:04 -0700 (PDT); There are various statements on various Internet sites about the GS-31b using the GS-35b heat sink. Some say that the heat sink works fine. Other sites say that the GS-31b heat sink works on the GS-3; /archives//html/Amps/2011-05/msg00169.html (7,580 bytes)
129. Re: [Amps] GS-35b heat sink (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 20 May 2011 08:25:00 -0700 (PDT); Glen, K9STH Website: http://k9sth.com I don't think the hole is tapered. I've seen loads of these things around at Eurpoean fleamarkets over the years, but never took that much notice of the tube ge; /archives//html/Amps/2011-05/msg00176.html (8,932 bytes)
130. Re: [Amps] GS-35b heat sink (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 20 May 2011 08:39:51 -0700 (PDT); I got an E-Mail from someone with photos of the both tubes, etc. It does look like it would be very easy to make an adapter ring for the GS-31b to use the GS-35b heat sink. Looking at the original Ru; /archives//html/Amps/2011-05/msg00177.html (11,245 bytes)
131. [Amps] Filament transformer needed (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Tue, 24 May 2011 20:37:53 -0700 (PDT); I need a 12.6 VAC @ around 10 amps filament transformer for my pair of GS-31b linear. The tubes require a total current of just under 7 amps so I would like a little "headroom". I would prefer a 220; /archives//html/Amps/2011-05/msg00209.html (6,660 bytes)
132. Re: [Amps] 4-1000A color (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 27 May 2011 14:21:27 -0700 (PDT); I have heard some REALLY "olde tymers" say that they ran a 6L6 with like 1200 volts on the plate. They had to send CW really fast because a short "dah" turned the plate red hot and a long "dah" melte; /archives//html/Amps/2011-05/msg00253.html (7,383 bytes)
133. Re: [Amps] old commercial amp (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 16 Jun 2011 19:45:37 -0700 (PDT); Nah! A 308-U20 is more like it! :>) Glen, K9STH Website: http://k9sth.com The AN/FRT-31 is likely the ultimate ba, but not for typical house hold use. _______________________________________________; /archives//html/Amps/2011-06/msg00201.html (7,265 bytes)
134. Re: [Amps] RAL color for Marconi AMP (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Tue, 5 Jul 2011 07:48:56 -0700 (PDT); Do what I do for "boat anchor" paints: Go to a Sherwin-Williams store and have the paint "computer matched". I use acrylic paint and that runs under $13 for a quart here in the Dallas, Texas, area. T; /archives//html/Amps/2011-07/msg00052.html (7,609 bytes)
135. Re: [Amps] RAL color for Marconi AMP (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Mon, 18 Jul 2011 17:01:33 -0700 (PDT); I finally got around to calculating the impedance of the Johnson design 6dB transmitting attenuators that I have been making for use with grid-driven amplifiers, etc. The impedance calculates out rig; /archives//html/Amps/2011-07/msg00218.html (8,949 bytes)
136. Re: [Amps] Need -- 300 ohm 50w noninductive resistor (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Wed, 20 Jul 2011 12:19:46 -0700 (PDT); Try Mouser ( http://www.mouser.com ) for thick film types. They do have to be attached to the chassis for heat sinking. Glen, K9STH Website: http://k9sth.com I'm looking for a 300-ohm 50w non-inducti; /archives//html/Amps/2011-07/msg00240.html (7,143 bytes)
137. Re: [Amps] Need -- 300 ohm 50w noninductive resistor (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Wed, 20 Jul 2011 16:37:01 -0700 (PDT); If you tried to find them on their website, if you don't really know how to search, you can go insane! They do have 50 watt, 300 ohm thick film resistors. The 1%, 50 watt, 300 ohm resistor is p/n 652; /archives//html/Amps/2011-07/msg00245.html (8,133 bytes)
138. Re: [Amps] Some PS questions (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 22 Jul 2011 14:55:54 -0700 (PDT); I put them in the power supply. Also, remember, in grounded grid, you will measure the grid current using this resistor as a shunt. In a grounded grid power supply you have to put the shunt between t; /archives//html/Amps/2011-07/msg00267.html (7,560 bytes)
139. Re: [Amps] Gettering 3-500 Tubes (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sun, 6 Nov 2011 10:27:21 -0800 (PST); The air doesn't leak through the glass! The problem with the 3-500Z is the seals around the tube pins. Tubes with small diameter pins do not usually have this problem and those that are decades old; /archives//html/Amps/2011-11/msg00015.html (14,125 bytes)
140. Re: [Amps] Gettering 3-500 Tubes (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sun, 6 Nov 2011 10:29:34 -0800 (PST); Not the SB-200 or SB-201, those amplifiers use 572B tubes. The SB-220 and SB-221 use 3-500Z tubes. Methinks your typing fingers got out of sync with the brain! :>) Glen, K9STH Website: http://k9s; /archives//html/Amps/2011-11/msg00016.html (10,173 bytes)

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