Seems like the 2C is the one drawing a lot of dough these days. And to think I sold one last year for under $100 (I paid $65 for it).
Of course, it doesn't sound nearly as Shakespearean... Steve Wedge, W1ES/4 I swear by my life, and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine. -Ayn Rand. All my computers have my signature with various pearls of wisdom appended thereto. From: nigel patterson Sent: Sunday, November 13, 2011 12:00 PM To: [email protected] Subject: Re: [Drakelist] Drakelist Digest, Vol 41, Issue 20 Another one for Steve Wedge: 2B or not 2B, that is the question - Shakespeare. Nigel Patterson On Sat, Nov 12, 2011 at 5:00 PM, <[email protected]> wrote: Send Drakelist mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://mailman.zerobeat.net/mailman/listinfo/drakelist or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Drakelist digest..." Today's Topics: 1. R-4B is "under contract" (Steve Wedge) 2. Bias Adjustment on TR4CW (Michael A. Kelly) 3. Re: Bias Adjustment on TR4CW (John Brown) 4. Re: Bias Adjustment on TR4CW (Ron) ---------------------------------------------------------------------- Message: 1 Date: Fri, 11 Nov 2011 20:19:57 -0500 From: "Steve Wedge" <[email protected]> To: "k4eg" <[email protected]>, "Drake List" <[email protected]> Subject: [Drakelist] R-4B is "under contract" Message-ID: <20A961ED89CA420DABB044FBA678B8DF@Shack7> Content-Type: text/plain; charset="iso-8859-1" My "demodded" Drake R-4B is sold pending payment. I'll be looking for more restoration projects at Benson (NC, Nov 20th)! I seem to be settling into working on Drakes and this burden is fitting to me well. I'm considering my "hobby-job" to be finding more tired Drake rigs and rejuvenating them. I'm learning even more as I go, and what I'm making allows me to buy even more Drakes to bring back from the dead. I've always enjoyed working on Drake gear: there are some aspects that can be challenging, but overall, it was well-designed and much more designed for serviceability than many other radios of its time. My shack has felt much more a "home" since I've set aside space for a set of Twins. Steve Wedge, W1ES/4 To be is to do - Socrates To do is to be - Plato Do be do be do. - Sinatra All my computers have my signature with various pearls of wisdom appended thereto. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/20111111/0c41b361/attachment-0001.html> ------------------------------ Message: 2 Date: Fri, 11 Nov 2011 21:53:55 -0500 From: "Michael A. Kelly" <[email protected]> To: [email protected] Subject: [Drakelist] Bias Adjustment on TR4CW Message-ID: <CAJWwtAAP=ykqfvaxb8zj41qtug6qwdf75owtyzcynqsd+1k...@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Question 1: Would tube life be extended if I ran my TR4Cw at 108-110 Volts AC instead of 120VAC? (All of the 21 tubes, not just the transmitting tubes?) I have access to a variac and could do it easily. Has anyone else done this? Obviously output would suffer a bit, but I typically run 90-100 watts maximum anyway. Aside from less possible total power output, is there a downside here? Question 2: When you adjust the PA Bias to 0.1 what exactly is that doing, decreasing the voltage similar to a variac? Does it affect all tubes, or just the finals? If so, again, why not turn it down to say 0.009 instead of 0.1 and again extend tube life? Thanks, Michael Kelly N4MAK ------------------------------ Message: 3 Date: Sat, 12 Nov 2011 15:31:26 +1100 From: "John Brown" <[email protected]> To: "'Michael A. Kelly'" <[email protected]>, <[email protected]> Subject: Re: [Drakelist] Bias Adjustment on TR4CW Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" Reducing the mains input probably wouldn't make any difference to tube life. Regarding the bias setting, changing this would only shift the class of operating the finals a tad from the design spec if any. Can't see much to be gained from doing either. Why not just use the rig and enjoy it? JB -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Michael A. Kelly Sent: Saturday, 12 November 2011 1:54 PM To: [email protected] Subject: [Drakelist] Bias Adjustment on TR4CW Question 1: Would tube life be extended if I ran my TR4Cw at 108-110 Volts AC instead of 120VAC? (All of the 21 tubes, not just the transmitting tubes?) I have access to a variac and could do it easily. Has anyone else done this? Obviously output would suffer a bit, but I typically run 90-100 watts maximum anyway. Aside from less possible total power output, is there a downside here? Question 2: When you adjust the PA Bias to 0.1 what exactly is that doing, decreasing the voltage similar to a variac? Does it affect all tubes, or just the finals? If so, again, why not turn it down to say 0.009 instead of 0.1 and again extend tube life? Thanks, Michael Kelly N4MAK _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist ------------------------------ Message: 4 Date: Sat, 12 Nov 2011 04:28:44 -0800 (PST) From: Ron <[email protected]> To: [email protected], "Michael A. Kelly" <[email protected]> Subject: Re: [Drakelist] Bias Adjustment on TR4CW Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Q1: It might help some, but it could just as well hurt the tubes.? All tubes are rated for a specific filament voltage.? All voltage variations, both above and below, specified voltage cause issues.? It is my understanding that indirectly heated tube (as are in all the Drakes) are more tolerant of slight voltage variations.? Other here have more background and will hopefully comment. Q2:? The bias you adjust on the Drakes is just on the finals. It is adjusted to make the final tubes amplify in a linear fashion.? Bias is a compromise, more bias generally makes the amplification more linear (less distortion) but less efficient, while less bias make the amplification more efficient and less linear (more distortion).? In the case of the Drakes, it is important to adjust the bias to the value that Drake engineered.? Anything outside of that value will either cause more "splatter" (distortion) or shorten tube life.? 73, Ron WD8SBB --- On Fri, 11/11/11, Michael A. Kelly <[email protected]> wrote: From: Michael A. Kelly <[email protected]> Subject: [Drakelist] Bias Adjustment on TR4CW To: [email protected] Date: Friday, November 11, 2011, 9:53 PM Question 1: Would tube life be extended if I ran my TR4Cw at 108-110 Volts AC instead of 120VAC? (All of the 21 tubes, not just the transmitting tubes?)? I have access to a? variac and could do it easily.? Has anyone else done this?? Obviously output would suffer a bit, but I typically run 90-100 watts maximum anyway.? Aside from less possible total power output, is there a downside here? Question 2: When you adjust the PA Bias to 0.1 what exactly is that doing, decreasing the voltage similar to a variac? Does it affect all tubes, or just the finals?? If so, again, why not turn it down to say 0.009 instead of 0.1 and again extend tube life? Thanks, Michael Kelly N4MAK _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/20111112/75cccdae/attachment-0001.html> ------------------------------ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist End of Drakelist Digest, Vol 41, Issue 20 ***************************************** -------------------------------------------------------------------------------- _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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