Discussion in 'Amateur Radio Amplifiers' started by W4EKY, Jan 16, 2017.
Those are the common 4-125A to 4-400 plus 3-400Z and 500Z sockets by Johnson. Same as in my LK-500ZC
If it works, no problem.
But, consider: to get more than 1 kW output on 6 the plate is probably dissipating in excess of 500 watts. While it may not show color, it's getting warm at that level.....
Yes they're really well made. And they've lived their lives in dry conditions....
73 de Jim, N2EY
I habe two new murata 880pf 20kv ceramic disc doorknob capacitors. Here is the manufacturers data sheet.
http://www.mouser.com/ds/2/281/Murata DHR_DHS Series-202906.pdf
Will these work as blocking caps in the tank circuit? How much rf will they handle?
Other options that i have on hand are one 2200pf 15kv sprague
3- sprague 500pf 20kv.
I'd say the Murata is "out." No RF current ratings of any kind, RF amps are not listed in potential applications, and I see they only plot D.F. up to 1.0 MHz, where it starts rising quickly. As a result, I'd say those are not "RF" capacitors at all.
No idea on the Sprague without actual part numbers and spec sheets.
2 x 4-1000 Cliff Kurtz (SK N6ZU) amp needs love. Suggestions appreciated. K8SJ
What doesn't work about it?
Impossible to tell or diagnose anything using photos...
It seems there is no connection to the plates, for starters.
K8SJ you should start a new topic with an applicable title.
Cliff N6ZU was featured in 2007 Electric Radio 218/219 in an article about his amps.
EdZ KG6UTS@AMSAT.ORG has a PDF of a QST article if he is still around I found his onfo in a post from 2011 on Amphone.net
That could cause an issue.
But the filaments alone could make a cool night light.
If you put 6kv on the plate, that will put the plate loading out the roof. In other words, plate load of about 5,000 ohms? And if thats the case, it has nowhere enough inductance (for a Q=12).
Hey, that's a really good solution for dealing with IMD on the HF bands. Thanks!