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Bob, I think I ditched the idea with a fuse. What the heck, if my 8171 box doesnt have a fuse why bother with this toybox. 73 SM2EKM ------------- Robert B. Bonner wrote:

I see. Well its getting strange. As I wrote before, in the manual I have someone had written 15 ohms on the schematic, there is no parts list in the manual. However I have two L-4Bs here and I see now

The L4B manual out of my file shows 3 - 15 OHM 2 Watt resistors as the Parasitic Supressor BOB DD

fired watts was Nigel, I also have a FL2100z, just got it going again after a mishap in shipping some years back(wonderful posties, AMP a tad heavy I guess) Anyway what sort of input Ia was the beast

Jim == The suppressor resistors are paralleled with c. 80nH of L. What frequency would be required to develop enough V-drop across 80nH to fry the resistors?

A timely question: Why did the resistors fry?

I must put this right. 15 ohms was wrong, sorry! Explanation: Since I have no manual I have found one on internet, on the schematic someone has scribbled with a pen 3 x 15 ohms for the resistors,

one sees obliteration, it usually means VHF oscillation. ### No it doesn't. With his 3 x paralled 15 ohm resistor's... it means he has 5 ohms in total.... and the wrong value to start with ! The goals

<rbonner@...> wrote: across the fuse incase it opens. ### IF u install a fuse in the B-.... it's technically a "cathode fuse"... and a 3agc fuse holder will suffice. Use a 750 ma fast blow fuse. ## A

As I recall, this is not the equation. R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

wrote: ### Whoa.. stop right there. I Don't have the L4B manual handy... but I'm positive they use 2 x 47 ohm 2 Watt carbon resistors.. and silver plated strap..... should be same or similar to the

no square in the equation... C = k * ( area/distance) k is the factor for insulator dielectric factor () is the ratio of the plate area divided by the distance between plates denny equation.

Hello, Jim. == In a VHF parasitic suppressor, when one sees obliteration, it usually means VHF oscillation. The goals of a VHF parasitic suppressor are to build one with a low VHF-Q that won't

Jim, If you think you need a B- fuse, put a 500 ohm 10-25 watt resistor across the fuse incase it opens. You should also have a 100-200 Ohm 25 watt B- lead to ground in the power supply and the 1 ohm

Im working on fixing up a L-4B, it has fried resistors in the supressors. They use 3 x 15 ohms but I have none in my junkbox however I have plenty of 10 ohm Rs, will that do? 3 x 10 ohm Rs? It doesnt

Gent's Check this out..... plus it's an interesting site worth bookmarking. http://www.pwrsource.com/196.html Then, after u have added it to ur shopping buggy.... all u gotta do is get ur local power

was ## I USED to own a FL-2100B new.. back in 1977. It did not have 160m in it. The xfmr ran hot, with just the fil + fan + hv on. Turns out they all do. [xfmr was a combo plate xfmr + fil xfmr] ###

The 350 V rating on 3 watt 100 k MOF resistor's on digikey's site does not indicate if this is ac or dc.. I'm assuming it's AC RMS.... if so... the DC V rating should be 495 V ??? On a similar note

something that thoriated-tungsten filament tubes do not need because their emissive layer (di-tungsten carbide / W^2C) can not be damaged by too much cathode current - as is the case with oxide