Does anyone on the list have a good used AL-82, 1200 or 1500 amp they are Willing to sell. These things are getting hard to find. Prefer the 82 as I love The glow of fire bottles but would consider a
Author: "WK1W Ivan Shapiro" <WK1W@ivanshapiro.com>
Date: Mon, 21 Oct 2013 14:40:19 -0400
Thanks to Dan N5AR. After his order there were 6 remaining. I just ordered two. So there are four remaining. 73 Ivan WK1W Send Amps mailing list submissions to amps@contesting.com To subscribe or uns
EE Sent from my Verizon Wireless BlackBerry --Original Message-- From: amps-request@contesting.com Sender: amps-bounces@contesting.com Date: Wed, 17 Aug 2011 12:00:13 To: <amps@contesting.com> Reply-
To add to the recommendations, Pi-L is excellent. On the toroid, 3 words of caution: 1. The power dissipation comments below are exactly right. The toroid will heat up. And you want to keep the heat
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 24 Nov 2024 21:24:07 +0200
Regarding the length of the leads, I had the same problem in my 4CX1000A amplifier <https://www.qsl.net/k2vco/4CX1000A/K2VCO%204CX1000A%20Amplifier.html> and I had to completely rebuild the tank circ
JI makes good points as to why an 80/160 only tapped toroid works well and is simply repeating what others knew in the late 70's and possibly earlier. Size the toriod properly, dont get carried away
ARRL Handbook, 2010 ed., 17.9.5 (p 17.27): "A third possibility is the use of an additional inductance connected in series between the tube and the tuning capacitor. In conjunction with the Cout of t
Here is W8JI's response about tapped toriod coils: It was over 3 years ago, I thought it was only a year. http://lists.contesting.com/archives//html/Amps/2007-03/msg00361.html This was my original qu
Hi Dan, I would not be so harsh as to stamp them "not suitable", but certainly they are not nearly as well suited for that task as some ferrite cores are. Heating is of course no problem at low power
Author: Steve Thompson via Amps <amps@contesting.com>
Date: Mon, 25 Nov 2024 14:23:16 +0000
Is the 27pF measured with the tube in the chassis? I've been surprised by how much extra capacitance appears when it's assembled. If you haven't already, leave the plate RFC and the first section of
I obviously meant the tube and socket is 27pF not uF. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Could you let me know where is it discussed, please? (the ham radio handbook by Orr? I've read it multiple times, but I don't remember that). I've added a coil in series that was stretched/compressed
No, the coil goes in series with the input to the pi network. I misspoke when I said it increases the impedance of the tube. The impedance doesn't change; you are just converting the pi network into
Gary, Larry, I could especially understand that if the toroid was in the Pi and used/tapped up thru 30 MHz, I wouldnt use one that way either. I tried that decades ago with poor results above about 1
I have an old TMC amplifier with a pair of 3-500 tubes. It originally had a toroidtank that had turns shorted for the higher bands. The core was quite large. The tank covered 160 - 15 meters. Effici
Happy 'Hump day' to all, I did a little investigation based on suggestions from members of the group. In preparation for running the amp with only one tube, and then the other tube, figured I would d
With both rigs the input showed low SWR. 40m on the K3 and 40 and 20m with the Omni. I guess the next thing is to swap out the tubes, one at a time. Steve That amp is notorious for frying input circu
What about the input VSWR? That amp is notorious for frying input circuits as well as that 40/80/160M toroidcoil, especially in high duty cycle modes. Bandswitching a toroid at those impedance trans
A yc-156 is hardly a compact tube. Why does size matter? STAY AWAY from using toridal inductors for tank circuits. Unless its just for the L coil in a PI-L. Use good ole wire wound coil. #10 or 12 is
Thanks Jerry, Good info. I am wondering if it isnt a binding motor/cap. The guy at the hamfest was a big guy and he transported it with the transformer installed. He also carried the amp caddy-corner