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References: [ +from:rbonner@qro.com: 226 ]

Total 226 documents matching your query.

141. Re: [Amps] B&W FC-30 Filament Choke: EPILOGUE (score: 1)
Author: "Robert B. Bonner" <rbonner@qro.com>
Date: Sun, 4 Mar 2007 10:52:55 -0600
Eddy, get an FC-25 from RF parts or Surplus sales of Nebraska. They are like $35 Good Morning All... ...And many thanks to the SEVEN respondents who took the time to address my query yesterday re. th
/archives//html/Amps/2007-03/msg00058.html (10,104 bytes)

142. Re: [Amps] B&W FC-30 Filament Choke: EPILOGUE (score: 1)
Author: "Robert B. Bonner" <rbonner@qro.com>
Date: Mon, 5 Mar 2007 11:52:49 -0600
Ahhhhh HA, They built two different versions of the FC-30 apparently. The toroidal version obviously the FC-30A I had always wondered what the difference was from an FC-30 and an FC-30A. The box look
/archives//html/Amps/2007-03/msg00067.html (12,650 bytes)

143. Re: [Amps] Centurion problems.... (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Fri, 9 Mar 2007 15:51:02 -0600
Whoops I'm not paying attention, Hello John, The metallic tink noise could have been the glass envelopes getting very hot. Or the bias relay clicking. I used to own a centurion, My front panel switch
/archives//html/Amps/2007-03/msg00152.html (9,647 bytes)

144. Re: [Amps] Need Help Diagnosing a Collins 30L1 Amp Problem (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Tue, 13 Mar 2007 22:11:38 -0500
Suspect bandswitch problems in the tank circuit sections. Make sure the sections are INDEXED correctly. If you took the switch rod out during cleaning or rebuilding there could be a possibility the l
/archives//html/Amps/2007-03/msg00166.html (9,955 bytes)

145. Re: [Amps] 3-400Z ZSAC (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Thu, 15 Mar 2007 21:00:28 -0500
Gary, The tube was built to run zero bias at about 2500V, you'll see about 170 ma at that amount. If you crank up the plate voltage to 3000 without adding 5-8.5V of cathode bias you will see 250ma of
/archives//html/Amps/2007-03/msg00176.html (7,668 bytes)

146. Re: [Amps] 3-400Z zsac tspa (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Fri, 16 Mar 2007 17:14:56 -0500
Gary, By the letter of the law, you don't need to do anything as long as you do not exceed 3000 Plate Volts. The resting plate current is only 750 Watts dissipation until you place RF on the input. T
/archives//html/Amps/2007-03/msg00186.html (11,826 bytes)

147. Re: [Amps] Help IDing DSdc diodes (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Fri, 16 Mar 2007 18:54:56 -0500
Since you'll never directly figure out what these are... You might as well fire them up. If they explode just buy something else. 1" square and 5.5 long sound like there's something inside the epoxy.
/archives//html/Amps/2007-03/msg00189.html (10,035 bytes)

148. Re: [Amps] Help IDing DSdc diodes (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Fri, 16 Mar 2007 21:17:46 -0500
Oh, I'm going to hurt myself laughing.. That's the best thing I've heard all day!!!! BBBZZZZZAAAPPPPPPPP!!! Oh God that's good. Oh that hurts. The best way to test unknown diodes: Attatch welding lea
/archives//html/Amps/2007-03/msg00192.html (12,466 bytes)

149. Re: [Amps] drive power (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Sun, 18 Mar 2007 13:22:28 -0500
Lou, Yes good old Icom and the 781 overshoot problem. The amps were Alpha 87A's (3CX800's) and the 781. The spike would send 200+ Watts on the first syllable to the amplifier and it would BLOW out th
/archives//html/Amps/2007-03/msg00215.html (10,542 bytes)

150. Re: [Amps] Amp Supply LK500-zc tube asymmetry (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Mon, 19 Mar 2007 23:19:51 -0500
Amp is broke, look under chassis for answer. BOB DD I have an Amp Supply LK500zc, which I purchased (used) about 3 years ago, used briefly, then put on the shelf until recently... when I powered it u
/archives//html/Amps/2007-03/msg00231.html (9,556 bytes)

151. Re: [Amps] drive power (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Mon, 19 Mar 2007 23:24:49 -0500
That's sort of true, but not always true Bob, for instance the IC-781 would unload with a 300W spike when it felt like it and it was only a 150watt radio. My amp would run at full power at 150Watts b
/archives//html/Amps/2007-03/msg00232.html (10,783 bytes)

152. Re: [Amps] Amp Supply LK500-zc tube asymmetry (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Tue, 20 Mar 2007 10:33:57 -0500
Yes exactly, the problem stays with the rear socket. Its either the filament pins or other issue at that socket. Flipping it over and figuring out which one will find/fix the problem. My guess is 80%
/archives//html/Amps/2007-03/msg00251.html (9,997 bytes)

153. Re: [Amps] Fault protection (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Thu, 22 Mar 2007 10:01:48 -0500
Well Lets see? I reach in the file and pull out 1 Drake L-4B manual and start reading, let's see what it says the resistor is for. First reference to the .82 Ohm resistor is in the unpacking section
/archives//html/Amps/2007-03/msg00302.html (9,893 bytes)

154. [Amps] Transformers (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Thu, 22 Mar 2007 10:11:19 -0500
In case anybody cares, I still have those industrial transformers and chokes which would build a GREAT REPLACEMENT power supply for something like an L-4B amplifier. The transformers are big about 40
/archives//html/Amps/2007-03/msg00303.html (6,840 bytes)

155. Re: [Amps] Tank Coil spacing (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Sun, 25 Mar 2007 20:41:06 -0500
Steve, I like to adhere to an absolute minimum of 1". I've been in arguments with others that voltage and RF will not arc down to 1/10" etc... However as you get COILS closer to the cabinet wall stra
/archives//html/Amps/2007-03/msg00336.html (9,322 bytes)

156. Re: [Amps] amp hardware (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Tue, 10 Apr 2007 13:03:08 -0500
Sodium Hydroxide (LYE) completely dissolves aluminum if left alone. Acid baths will slowly eat away or etch aluminum... I can see where Barrie would have holes getting bigger, metal getting thinner e
/archives//html/Amps/2007-04/msg00057.html (12,999 bytes)

157. Re: [Amps] RE : amp hardware (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Tue, 10 Apr 2007 15:43:51 -0500
Yeah Hey PETER, don't do the LYE bath treatment while driving to work... Yes you also hit the nail on the head, HELICOILS are all the rage for strong threads mounted in aluminum. But you need depth n
/archives//html/Amps/2007-04/msg00064.html (9,317 bytes)

158. Re: [Amps] RE : amp hardware (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Tue, 10 Apr 2007 17:25:21 -0500
The magic word is: PRESS NUT BOB DD Another option is a device I use at times (can't remember the name at the moment. It's at home and I'm at work.) is a largish pair of pliers that presses a special
/archives//html/Amps/2007-04/msg00071.html (9,453 bytes)

159. Re: [Amps] RE : amp hardware (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Tue, 10 Apr 2007 18:33:56 -0500
The other version of pressnuts are weld nuts they look about the same except don't have the little ridges. They install finger tight in a slightly larger hole and you BLAM them with a spot welder. I
/archives//html/Amps/2007-04/msg00074.html (10,963 bytes)

160. Re: [Amps] Ceramic capacitor ratings (score: 1)
Author: "Robert Bonner" <rbonner@qro.com>
Date: Sun, 15 Apr 2007 08:02:18 -0500
Boy exactly Peter... I've always thought the same thing. Pop the top off an amplifier rated at such and such and go, whoa, these guys are dreaming. Every amplifier I've built after the first few were
/archives//html/Amps/2007-04/msg00127.html (10,420 bytes)

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