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Total 1185 documents matching your query.

121. Re: [Amps] 4x813`s in GG (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 27 Jul 2009 11:30:29 -0700
ORIGINAL MESSAGE: REPLY: You probably can get away with it, but the manufacturer's data sheet says 2500 VDC is the max allowed. There probably is a little cushion there but I wouldn't push it too far
/archives//html/Amps/2009-07/msg00340.html (6,847 bytes)

122. Re: [Amps] grounding grids (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 29 Jul 2009 20:29:07 -0700
ORIGINAL MESSAGE: REPLY: Also, that isn't true negative feedback anyway. It is just gain reduction. True negative feedback means taking a sample of the output, inverting the phase (if needed), and fe
/archives//html/Amps/2009-07/msg00384.html (9,641 bytes)

123. Re: [Amps] grounding grids (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 30 Jul 2009 04:38:21 -0700
ORIGINAL MESSAGE: REPLY: I can't say. I am not an expert on IMD, but I stand by my previous statement - simply adding a resistor (or network) in the grid circuit is not negative feedback, it's just g
/archives//html/Amps/2009-07/msg00398.html (9,527 bytes)

124. Re: [Amps] grounding grids (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 30 Jul 2009 08:30:57 -0700
ORIGINAL MESSAGE: REPLY: Another possible reason for reduced IMD is the added grid resistor smoothes out the load over the RF driving cycle, in the sense of a "swamping" resistor, although in series
/archives//html/Amps/2009-07/msg00405.html (9,350 bytes)

125. Re: [Amps] grounding grids (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 30 Jul 2009 09:09:36 -0700
ORIGINAL MESSAGE: REPLY: An un-bypassed emitter resistor is not negative feedback, it is just gain reduction. For true NFB you have to take a sample of the output and feed it back to the input, out o
/archives//html/Amps/2009-07/msg00407.html (10,505 bytes)

126. Re: [Amps] grounding grids (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 30 Jul 2009 13:54:11 -0700
ORIGINAL MESSAGE: REPLY: I guess we will have to agree to disagree. In my view, doing what you state above does reduce gain, increases input impedance and may he highly desirable is several respects,
/archives//html/Amps/2009-07/msg00413.html (9,639 bytes)

127. Re: [Amps] grounding grids (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 01 Aug 2009 21:49:17 -0700
ORIGINAL MESSAGE: REPLY: I agree. If series or parallel impedance is needed in the input network, it generally should be added in the cathode. There may be some obscure reason to put it in the grid c
/archives//html/Amps/2009-08/msg00020.html (7,450 bytes)

128. Re: [Amps] Simpson 260 question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 03 Aug 2009 15:30:22 -0700
ORIGINAL MESSAGE: REPLY: Even better is to make the connection to the meter with the power off, turn on the power, take the measurement and turn off the power. In other words, don't touch the meter,
/archives//html/Amps/2009-08/msg00070.html (8,500 bytes)

129. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 04 Aug 2009 08:19:19 -0700
ORIGINAL MESSAGE: REPLY: Manufacturers usually try to save every penny they can, so if they use a relatively large capacitor like in your TX, there may be a good reason. Or it just may be they had a
/archives//html/Amps/2009-08/msg00080.html (7,560 bytes)

130. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 04 Aug 2009 20:47:07 -0700
ORIGINAL MESSAGE: REPLY: I'm pretty sure he means the bypass cap at the cold end of the plate RF choke. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contestin
/archives//html/Amps/2009-08/msg00083.html (7,392 bytes)

131. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 05 Aug 2009 18:24:46 -0700
ORIGINAL MESSAGE: REPLY: It is actually higher than that. When properly tuned and loaded, the peak RF voltage at the plate swings from the DC supply voltage to near-ground on one half the RF cycle an
/archives//html/Amps/2009-08/msg00091.html (8,260 bytes)

132. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 06 Aug 2009 13:31:36 -0700
ORIGINAL MESSAGE: REPLY: You are correct, my oops. I was thinking peak voltage on the plate and you were talking RMS. However, your example of 600 VRMS on the plate of a 6146 grossly exceeds the manu
/archives//html/Amps/2009-08/msg00104.html (8,786 bytes)

133. Re: [Amps] How do you measure HV with reasonable accuracy? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 06 Aug 2009 19:42:17 -0700
ORIGINAL MESSAGE: REPLY: Either one of those will work, the question is how will you verify the accuracy? I recommend getting a Fluke DMM and a Fluke HV probe. Spend the money, you won't be sorry. 73
/archives//html/Amps/2009-08/msg00112.html (7,627 bytes)

134. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 06 Aug 2009 19:47:59 -0700
ORIGINAL MESSAGE: REPLY: Right you are. Looking at the data sheet I missed the heading. It never occurred to me that anyone would actually run a 6146 as a triode-connected audio amplifier. Sheesh! 73
/archives//html/Amps/2009-08/msg00113.html (8,720 bytes)

135. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 06 Aug 2009 19:53:10 -0700
ORIGINAL MESSAGE: REPLY: It is indeed 400 VDC but only for a triode-connected audio amp. For normal RF service, 750 VDC is ok for ICAS. Sorry for the confusation. 73, Bill W6WRT _____________________
/archives//html/Amps/2009-08/msg00114.html (8,753 bytes)

136. Re: [Amps] How do you measure HV with reasonable accuracy? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 07 Aug 2009 00:38:05 -0700
ORIGINAL MESSAGE: REPLY: Not wanting to state the obvious, but just in case....... Any HV probe, including the Fluke, is designed to work with a meter having a specific input resistance. Be sure it m
/archives//html/Amps/2009-08/msg00118.html (8,467 bytes)

137. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 07 Aug 2009 07:57:57 -0700
ORIGINAL MESSAGE: REPLY: You got that right. Note to self: FOCUS. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/
/archives//html/Amps/2009-08/msg00128.html (9,027 bytes)

138. Re: [Amps] plate bypass capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 08 Aug 2009 13:56:57 -0700
ORIGINAL MESSAGE: REPLY: At the power level we are talking about, you absolutely do not want the RF choke to be parallel resonant at the operating frequency, lest you soon have a smoke-filled room. :
/archives//html/Amps/2009-08/msg00135.html (8,469 bytes)

139. Re: [Amps] plate bypass capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 08 Aug 2009 21:30:02 -0700
ORIGINAL MESSAGE: REPLY: A "too small" choke is indeed in parallel with the tune cap, but it had better not be *resonant* with it or fireworks will follow. The relatively low reactance of the "too sm
/archives//html/Amps/2009-08/msg00138.html (8,867 bytes)

140. Re: [Amps] plate bypass capacitor (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 09 Aug 2009 16:40:14 -0700
It means using the standard formula for opposite reactances in parallel. Perhaps Icon fused you by saying "in a non-resonant manner". I was just emphasizing that the values under discussion were not
/archives//html/Amps/2009-08/msg00174.html (10,621 bytes)

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