Usually 250V. The more robust ones are rated for 500V, but generally as capacitance range goes up working voltage goes down. See if you can find some Russian surplus on ebay, those trimmers are built like a tank.
On Sun, Jun 27, 2010 at 5:58 PM, Tim <[email protected]> wrote: > > > Hi Eric, > > I've been on Dan's site & he has some good stuff. > I had the piston trimmers 'in-stock', so that's what > I used. (as did the original design) Was curious > About the WV of them. > > Thanks, > > Tim > > > ------------------------------ > From: Eric Grabowski <[email protected]> > Sent: Sunday, June 27, 2010 5:02 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Piston Trimmer Voltage Rating > > > > Instead of piston trimmers you might want to try ARCO padders (postage > stamp size that can tolerate higher levels of rf current) or small air > variable capacitors. I have found both at reasonable prices at this site: > > http://www.danssmallpartsandkits.net/ > > 73 and aloha, Eric KH6CQ > > --- On *Sun, 6/27/10, Tim <[email protected]>* wrote: > > > From: Tim <[email protected]> > Subject: [Repeater-Builder] Piston Trimmer Voltage Rating > To: [email protected] > Date: Sunday, June 27, 2010, 11:18 AM > > > > Hi folks, > > Am just finishing up the 6 meter heliax duplexer project, > and am getting some pretty good numbers. (3 'cans' on > each side, >90dB notch & about 1.2dB 'pass' attenuation).. > > Anyhow, I used some Johanson piston trimmers that I had, > but evidently they are a bit shy on the working voltage > rating, as the one closest to the transmitter (80 w, @53.15) > didn't quite cut the mustard! A nice arc hole in the piston. > > Anyhow, was wondering what the working voltage is for > these guys. > > Guess I need to look around for some substitutes. > > Thanks, > > Tim W5FN > Utopia, TX > > > > [The entire original message is not included] > >
