Did they have a resistor between them or at one side of a large RF Choke? pete
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Vic K2VCO Sent: Wednesday, June 28, 2006 8:15 AM To: David Douglass; Elecraft Reflector Subject: Re: [Elecraft] RE:Slightly off top amp question (David Douglass) David Douglass wrote: > On closer inspection I have so far found 2 ceramic door knob capacitors that > were falling apart !! These were not in the input coil alignment section, > but near the valves and band-switch in the amp. These are probably padders to supply more capacity to either the tune or load capacitors on 80 and 160 meters. If they are broken, it might be hard to resonate the output circuit on these bands which would cause problems with input SWR and of course power output. > For you RF guru's out there... I have a couple of questions.. > 1. Is it possible to solder these capacitors back together ? They are the > flatter type doorknob caps and basically what has happened with both of them > is that the one of the screw housings has fallen off the side of each cap > (hope this makes sense). I don't know, but I would certainly try, with silver-bearing solder! Look carefully to see if the units are not otherwise damaged. > 2. Secondly, if this is not advisable, can I just replace these with the > standard type (barrel shaped) door knob caps, as long as the KV rating is > greater or equal to that of the originals ?? Surplus sales have these for > under $20US each Probably yes. There is both a current and a voltage issue, but in this application the 5 KV types should be OK. $20 seems steep, however. Try this guy: <http://www.mgs4u.com/RF-Microwave/doorknob-capacitors.htm> He is honest and has reasonable prices. Also you might check Fair Radio Sales <http://fairradio.com/>, who are cheaper than the so-called 'surplus bandits'. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com __________ NOD32 1.1630 (20060628) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
