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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

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 ceramics, rf current

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

Capacitors have current ratings too. Voltage is one parameter and the current rating is another. Lee, w0vt

<Slightly off topic, <I am using an old Heathkit antenna switch that has the control voltages riding on the coax. The <series DC blocking capacitor in the outside box has a piece chipped out of it.

Yep, they show up on the various hot rod forums I frequent and are right at the top of their game. The last shipment was a comple running low mileage Ford 460 and C6 still attached going into an early

The choke should be doing most of the work and the cap very little. My HB and Ameritron switches all use a generic Z5 single .01 1KV right up to 1200-1500W on HF for decades of heavy use without

Yeah. Lotta rev heads downunder.

<<A total of .01 is more than enough, maybe a blown .02 was already removed in the past>> Thanks Carl, It's a stock box and the schematic shows it as I've described. There aren't any dissipation specs

A total of .01 is more than enough, maybe a blown .02 was already removed in the past Carl

Find a local freight forewarder and get quots for ship and air. They combine multi items in one container for a lower cost. Ive shipped several amps as well as complete vintage V8 engines that way all

That’s useful to know, thanks. ?I have a stock of YU204s for the 4-1000 amp and 3CX3000s for that amp but could do with a spare Thomson TH376 or two if anyone knows where to source those?Dave

Curious, how much? Bob WE6C

<I need to ship a Drake L4B to a ham in VK6 land. The quotes I found from FedEx DHL etc are totally nuts. <thanks <John k9uwa ## Drake L4PS ( HV supply) weighs 45 lbs. Drake L4B RF deck weighs 30 lbs.