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101. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 12 Nov 2007 13:29:50 -0500
On this business of resonating an inductive dummy load, I decided to put some numbers into the thing so we can sort the wheat from the chaff. First, I am sure that we are all in agreement that if the
/archives//html/Amps/2007-11/msg00172.html (9,008 bytes)

102. Re: [Amps] 50 Ohm Loads (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 12 Nov 2007 16:32:29 -0500
Guys: If a .01 uF cap was used in series with a load to tune it to 1 MHz, then the load had an inductance of 2.533 uH. The return loss would be 20 dB or better over the range of 750 kHz to1320 kHz. I
/archives//html/Amps/2007-11/msg00179.html (9,081 bytes)

103. Re: [Amps] BeO in tubes (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Sun, 18 Nov 2007 14:53:46 -0500
In the mid 50's, I handled some 1625 tubes without any gloves or other protective devices. Now, my hair is gray and seriously thinning, my eyesight is not as good as it was, my hearing is in the pits
/archives//html/Amps/2007-11/msg00255.html (7,496 bytes)

104. Re: [Amps] Winding large inductors (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Tue, 20 Nov 2007 17:05:14 -0500
Pinch one end shut, fill it with sand, pinch other end shut. Wind the coil. To keep the tubing from collapsing it must be FULL and tamped. When done, unpinch an end and remove the sand. If you want
/archives//html/Amps/2007-11/msg00289.html (7,912 bytes)

105. Re: [Amps] Tranformer Suppliers (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Fri, 7 Dec 2007 18:21:46 -0500
Steve: I don't think its a matter of getting the materials because the lamination folks won't sell to an individual a quantity for a single transformer. And I don't think its a matter of how to do it
/archives//html/Amps/2007-12/msg00047.html (9,477 bytes)

106. Re: [Amps] EZ Master (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Sun, 9 Dec 2007 08:39:05 -0500
I assume you have contacted PayPal about this. Normally the seller has to walk the straight and narrow or PayPal will drop them. Also I *think* there is a 90 day limit on getting your money back. - J
/archives//html/Amps/2007-12/msg00103.html (7,319 bytes)

107. Re: [Amps] Spilled my beads (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Sat, 22 Dec 2007 09:33:55 -0500
I think the request for help centered not on how to retrieve them from the floor but in identifying the different types and putting them back into the right bins. - Jim WB6BLD ______________________
/archives//html/Amps/2007-12/msg00200.html (7,449 bytes)

108. Re: [Amps] HV Supplies and Diodes (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Wed, 2 Jan 2008 14:20:06 -0500
When a string of series-connected diodes is reverse-biased (during part of the cycle), the voltage drop across one is proportional to its leakage resistance. If the junction of the diode type has sig
/archives//html/Amps/2008-01/msg00017.html (7,261 bytes)

109. Re: [Amps] More on using a PIC processor inside HF amp (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Thu, 7 Feb 2008 14:55:29 -0500
Gents: About using a PIC or equivalent in a transmitter: Don't ever use it for protection where, if it failed for any reason, things could cause hardware problems (or human problems). On high-powered
/archives//html/Amps/2008-02/msg00041.html (7,674 bytes)

110. Re: [Amps] Needed Info (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Thu, 21 Feb 2008 11:11:23 -0500
I thought the "3000" part of the tube nomenclature indicated 3000 watt dissipation. The oscilloscope display show pretty terrible distortion on the negative (versus positive) peaks. - Jim WB6BLD ____
/archives//html/Amps/2008-02/msg00141.html (7,329 bytes)

111. Re: [Amps] Class-E Amplifiers (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Fri, 29 Feb 2008 18:09:10 -0500
There is not upper limit to how high in frequency a Class E amplifier can operate. The "final amplifier" operates as a switch and so the use of a tetrode instead of a triode would be best. At 75 mete
/archives//html/Amps/2008-02/msg00229.html (8,367 bytes)

112. [Amps] Power transformer for 600 watt rig (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 17 Mar 2008 18:47:23 -0400
To the techies on this list. I am designing a power supply using LTspice and need some numbers. Just had a thought that you might be able to answer a question I have. Do you know about what the vario
/archives//html/Amps/2008-03/msg00154.html (6,923 bytes)

113. Re: [Amps] Power transformer for 600 watt rig (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 17 Mar 2008 21:47:15 -0400
Gary: Do you have LTspice? I will plug those numbers into the transformer model to complete the design. The numbers I quoted are adequate for the problem as stated. - Jim Tonne ______________________
/archives//html/Amps/2008-03/msg00158.html (7,102 bytes)

114. [Amps] Power transformer, power supply (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Tue, 18 Mar 2008 14:51:23 -0400
I have posted the schematic of a power supply as analyzed by LTspice so that the effects of even small changes can be seen. The schematic reveals the use of a stepstart scheme. When specifying a powe
/archives//html/Amps/2008-03/msg00168.html (7,969 bytes)

115. Re: [Amps] What is this amp set up for (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 24 Mar 2008 11:37:24 -0400
Very slightly off-topic: when traveling through the countryside, I always pass by restaurants whose windows are dirty. The idea is that if they can't take the time to clean their windows, then perha
/archives//html/Amps/2008-03/msg00236.html (8,887 bytes)

116. Re: [Amps] 3CX3000A7 input impedance (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 21 Apr 2008 12:36:31 -0400
I had no problem with the Eimac version of the 3CX3000 but the Svetlana version made me jump through hoops, which I refused to do. - Jim WB6BLD _______________________________________________ Amps ma
/archives//html/Amps/2008-04/msg00252.html (8,304 bytes)

117. [Amps] Tuning knob for ARC-5 receiver (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 12 May 2008 16:20:18 -0400
Do any of you fellows know how to cobble together a tuning knob for the ARC-5 receivers? I have one that I want to resurrect so I can monitor 3885 kc and I thought maybe someone in this group would h
/archives//html/Amps/2008-05/msg00087.html (6,938 bytes)

118. Re: [Amps] Fwd: Re: Input Coils...SB-220 (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Tue, 1 Jul 2008 18:53:35 -0400
Jeff: Gorgeous work! - Jim Tonne WB6BLD _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-07/msg00007.html (6,589 bytes)

119. Re: [Amps] New Tubes - Question (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Fri, 18 Jul 2008 17:41:15 -0400
Jim: Interesting document, outlining what do do as well as what not to do, and why. - Jim WB6BLD _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2008-07/msg00148.html (7,605 bytes)

120. Re: [Amps] Air variable pitting - repairable? (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Sat, 19 Jul 2008 17:27:08 -0400
Regarding the air variable and its repair or whatever. What I think is being overlooked is what caused the problem in the first place. Has that problem been resolved? If so THEN a repair can be put i
/archives//html/Amps/2008-07/msg00156.html (7,746 bytes)

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