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A local ham dropped in a Yaesu FL-2100Z amp tp me and said that he would like all the PA0FRI mods done to it. See http://www.pa0fri.com/ This is no big problem, as most of the mods are common sense

Filling the connector with a dielectric splodge is certainly a new trick to me.? Even with PL259s I've always just wrapped things in good self-amalgamating tape to waterproof it properly and have

Wow, a UB50 beam hey....that antenna will work very nicely! We just need Solar Cycle 25 to arrive.....you'll be well prepared when it does. Hopefully being deployed at considerable height.....I

Thanks Leigh. Yes, I bought 5 tubes, to share the postage costs, plus I know that the 3 mates who are coming down here to help build and install my Ultrabeam UB50, (if it ever stops raining) will

Indeed Alek, the stuff here is called STUF….. :-) I can vouch for its efficacy as a stable non-hardening moisture sealant compound and it works a treat in preserving weather exposed RF

OK Thanks Mike and others who replied. Jerry, WA8R, knew what I was talking about. The stuff is called "Stuf" and it's made by Cross Devices. See

Hi Alek Stuff? You mean Splodge?? I always find that Splodge works better than Stuff. Alternatively try Tiger Seal or similar from a motor

Next time you see a telephone lineman, ask him for a tube of his line sealant. Works great. But, be aware, that once sealed, it isn't coming back apart again. Joe - W7RKN

Automotive silicon dielectric grease works for me. 73 Mike

Does anybody know where to get "Stuff?" I'm talking about the goo that you put in coax connector joins, which fills the void in the connection and seals out any moisture. A Google search has come up

Jim, ask him if Eimac supplied tooling is used to build the Chinese 8877 and 3CX3000A7. Carl

Hello Jim, If the Svetlana tubes have good grids then we can repair them. If the grids are bad then we don’t rebuild them. We don’t buy Svetlana duds so we don’t normally have stock on Svetlana

I got mine from Amp Supply and later from Bill Edwards, K4BWC (SK) who was their Service Mgr and ran Omega Electronics. After he died I bought several items from his estate. I believe Ameritron uses

<Teflon dielectric discs have been available for decades at least to 1000pf <and maybe higher. <Ive used them for decades when modifying amp pi networks to work into high <VSWR's on

BUT there are no .02 NPO caps and there is no reason to have so much C in the RF path. Anything over 2000pf is overkill.

Teflon dielectric discs have been available for decades at least to 1000pf and maybe higher. Ive used them for decades when modifying amp pi networks to work into high VSWR's on 160-80. Carl

Indeed Jim; that limitation of high Q COG / NPO material ceramic to low C values is correct....generally limited to a few hundred pF to 1 nF or so. Bottom line is lossy X7R, Z5U, Y5V, etc ceramic

Published current ratings and actual cap ratings may or may not co exist.? But the fact remains an application may require a cap with an appropriate capacitor current capability.? I have a Johnson

LEIGH, When was the last time you ever saw a NPO .01uf DISC CERAMIC ???? They don't exist, never did. They are typ Z5u, z5t etc. I have never seen RF current ratings for disc

Indeed they do. The current handling / rating is usually defined by the capacitor's Equivalent Series Resistance / ESR and its dielectric losses Dissipation Factor / loss tangent which is highly