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Hi I have done an amp that had suffered multiple oscillations on 10 meters and damaged the bandswitch. The grounding of VC1 was done according to the article and that cured the oscillation. Amp was

GN, I've made some mods to 2100B, 2100Z, etc., several. I have never made that specific mod, all amps worked fine and stable. What I usually do is to add extra decoupling caps in plate choke base

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 expect

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 want

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 connector

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 factors.??

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 160-80. <Carl ##

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 disk

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