Depends on where they are used, and how much they will be subject to mechanical and/or audio induced vibrations. If the speaker is sitting on top of the receiver cabinet, you might have a problem.
73, Jack, W9GT -------------- Original message -------------- > g kwitka wrote: > > >An audiophile friend gave me some tubes that he > >couldn't use in his preamp because they exhibited > >microphonics. Is it possible to use them in rf and if > >stages without degrading performance in a receiver? > > > > > > Depends - what tubes are they? > > --- > -Geoff/W5OMR > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami From [EMAIL PROTECTED] Mon Oct 31 15:29:59 2005 Return-Path: <[EMAIL PROTECTED]> X-Original-To: [email protected] Delivered-To: [email protected] Received: from stonewebs.com (unknown [69.10.138.140]) by mailman.qth.net (Postfix) with SMTP id 3545185A0E4 for <[email protected]>; Mon, 31 Oct 2005 15:29:42 -0500 (EST) Received: (qmail 2225 invoked by uid 89); 31 Oct 2005 18:00:11 -0000 Message-ID: <[EMAIL PROTECTED]> References: <[EMAIL PROTECTED]> In-Reply-To: <[EMAIL PROTECTED]> From: "ne1s" <[EMAIL PROTECTED]> To: Discussion of AM Radio <[email protected]> Date: Mon, 31 Oct 2005 13:00:11 -0500 Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Subject: [AMRadio] Re: High Voltage Power Supplies X-BeenThere: [email protected] X-Mailman-Version: 2.1.4 Precedence: list Reply-To: Discussion of AM Radio <[email protected]> List-Id: Discussion of AM Radio <amradio.mailman.qth.net> List-Unsubscribe: <http://mailman.qth.net/mailman/listinfo/amradio>, <mailto:[EMAIL PROTECTED]> List-Archive: <http://mailman.qth.net/mailman/private/amradio> List-Post: <mailto:[email protected]> List-Help: <mailto:[EMAIL PROTECTED]> List-Subscribe: <http://mailman.qth.net/mailman/listinfo/amradio>, <mailto:[EMAIL PROTECTED]> X-List-Received-Date: Mon, 31 Oct 2005 20:29:59 -0000 This part sounds like an inrush limiter, not a transient suppressor. They are useful to prevent inrush current stress of tube filaments, and may also be a good idea for HV supplies, especially capacitor input. Digikey carries them - the Digikey part number for the CL-30 is KL003 - something. The CL-80 is useful to prevent the power microswitch from welding closed on your R-390/R390A (Jan Skirrow whote this up - it's somewhere on the web). 73, -Larry/NE1S [EMAIL PROTECTED] writes: > Noit sure Don - a fellow ham traded these to me. > They are black disks and look pretty much like a large > ceramic capacitor, if you can imagine... > > They are marked: > STM and CL-30 > > I think the resistance at rest is about 3 to 5 ohms. > > On 30 Oct 2005 at 9:24, Rev. Don Sanders wrote: > >> OK Bry, You got my interest. What is the part number and are they from >> Mouser? I know I need several for my boatanchors and my 2 Astrons(20 and 35 >> amp). >> >> Healthfully yours, >> DON W4BWS >> ----- Original Message ----- >> From: <[EMAIL PROTECTED]> >> To: "Discussion of AM Radio" <[email protected]> >> Sent: Sunday, October 30, 2005 7:27 AM >> Subject: Re: [AMRadio] High Voltage Power Supplies >> >> >> > On 30 Oct 2005 at 9:08, Ed Swynar wrote: >> > >> > > Is this the reult of transients / voltage spikes somehow "overwhelming" >> > > the diodes...? >> > >> > Probably - why not try one of those transient suppressors (varistor I >> think) >> > on the primary side of your power tranny? >> > I just put one in my Astron 35M and it eliminated the "THUNK!" >> > at power-on. >> > >> > A number of guys have put them into Johnson xmtrs with similar >> improvement. >> > Maybe it could save your diode strings. >> > >> > Do you have a capacitor-input filter on the p.s.u.? >> > Choke input filters tend to be a bit kinder to the rectifiers. >> > >> > 73 de AF4K, Bry >> > >> > ______________________________________________________________ >> > AMRadio mailing list >> > Home: http://mailman.qth.net/mailman/listinfo/amradio >> > Help: http://mailman.qth.net/mmfaq.html >> > Post: mailto:[email protected] >> > AMfone Website: http://www.amfone.net >> > AM List Admin: Brian Sherrod/w5ami >> > >> >> >> ______________________________________________________________ >> AMRadio mailing list >> Home: http://mailman.qth.net/mailman/listinfo/amradio >> Help: http://mailman.qth.net/mmfaq.html >> Post: mailto:[email protected] >> AMfone Website: http://www.amfone.net >> AM List Admin: Brian Sherrod/w5ami > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami
