[Drakelist] RF Tube Testing

I am looking for some guidnace on testing RF amplifier tubes.  I have a couple of 3-500Z tubes that I would like to determine if they are keepers or should be sent on to the Great Junk Pile In The Sky.  I would much prefer to NOT put them in in my working amplifier.  I'm sure Murphy would

[Drakelist] PS-7 Crowbar SCR

I have a PS-7 with a shorted crowbar SCR. Does anyone have a suggestion for an up-to-date replacement SCR? I am hoping just about any 50A, 200V stud mounted SCR with a reasonable trigger voltage will work. TNX, LLOYD - K4HWB___ Drakelist mailing

[Drakelist] R4C Static

I have noticed that when using narrow CW Filter's in my R4C that I hear low-moderate static bursts,like storm static. I have substituted each and all the 6EJ7's with new tubes.no change. I removed each and all 6EJ7 tubes and power it on with no change in the static. I remove the 6BA6 RF

Re: [Drakelist] PS-7 Crowbar SCR

old message, may still be valid http://www.mail-archive.com/drakelist@zerobeat.net/msg18339.html --- On Mon, 7/16/12, Lloyd2 rafa...@att.net wrote: From: Lloyd2 rafa...@att.net Subject: [Drakelist] PS-7 Crowbar SCR To: drakelist@zerobeat.net, drakera...@yahoogroups.com Date: Monday, July 16,