On Sat, 15 Jul 2000 12:54:17 -0500 "Phil Clements" <philk5pc@tyler.net> writes: . Since the Q is (typically) rather low compared to the PI application, the circulating current is also reasonable, req
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Tue, 16 May 2006 12:22:46 +0200 (CEST)
== Chuck asks: One problem you can have is being able to get thick enough wire on to the core. At 1500 watts, you can have a lot of current in that coil, so you need a hefty conductor. You also need
You also have to be careful tapping a toroid. If the core doesn't have enough flux leakage, it can develop extremely high circulating currents in the turns. As a general rule, you are better off NOT
I am loading the amp for maximum output with either tankcoil installed. Plate voltage is right at 3000 volts at 700 ma. Plate current may have been slightly different in one case but not much if any
So I used the measurement technique from Tom W8JI that he has on his site and found that the 160 meter toroid was certainly resonate on 10 meters! No matter what I did. Sure, I could move my hand aro
Thanks for the idea Dan... I moved the toroid away from the loading cap. Made a huge difference. Its now hooked to the back of the loading cap and the bandswitch. Now it runs pretty cool. No more smo
Hi Gary, It's quite simple, if you look at it analytically, instead of applying cookbook formulas and blindly believing in the results! Unfortunately, many engineering books use the cookbook approach
Jim, That's exactly the way the tech at Palomar Engineers explained it to me years ago. The problem was that 43 material got too hot to the point of ruin. The only help for that would be use a good a
I'm a bit late to the table on this issue, because I've been on the road almost continuously for three weeks. But I have some comments that might shed some light. First, I agree with John's comments
Asked, "Hello! I'm building my own h.m. PA with GU-84B tube. The output tank will be a Pi-L network. I just got few T225-2B toroids (I Powder, 2.25" O.D. x 1.0" Height) for my L-coil. I wonder what i
Hello! I'm building my own h.m. PA with GU-84B tube. The output tank will be a Pi-L network. I just got few T225-2B toroids (I Powder, 2.25" O.D. x 1.0" Height) for my L-coil. I wonder what is the ma
Jim, I would try a small air wound coil similar to what you would use in a parasitic suppressor in series with the toroid, maybe in the lead to the switch. Dan, N5AR -- Dan Hearn N5AR _______________
Hi Tom, Thanks for your reply. Yes it does get confusing when you try to understand the full meaning of what really happens. All the stuff that I am reading about figuring tank Q only mentions load i
Both leads are shored by the band switch when on 10 meters guys. Interesting that 3 of you came up with the same possibility... Not sure where to put the capacitor if both leads are shorted together.
Bill, Wind it on a piece of 3 inch diameter pipe under as much tension as you can and you will have a strong, stiff coil with plenty of current carrying capacity. It will have essentially zero loss a
Carl, Let's do a real, practical design, to find out how much difference there is. The exercise might be illustrative to people actually still building tube amps and considering the use of toroids. M
As far as the 50 volt power supply, You'd need about 50 amps for a for a 1,000 watt amplifier. (Class A/B efficiency). I am looking for a similar supply, but I'm leery of all the pin-outs. Most requi
Carl, ** Youre certainly wrong all right Manfred. The slight size difference is not enough to make much difference especially when only about 1/2 the turns the core is capable of for a pratical SB-22
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 25 Nov 2024 17:30:20 +0200
That amp was good for more than 1500w on all bands. There are many commercial and homebrew amps using tetrodes that can do this. Neutralization isn't relevant to the problem that you are having. The
Jim, I think your 160 toroid when shorted is self resonant with its distributed capacitance on 10m. You might be able to solve this by putting a small cap across the 160 m toroid to move its self res