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: drakelist@zerobeat.net
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, <drakelist-requ...@zerobeat.net> wrote:
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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" <w1es1...@earthlink.net>
To: "k4eg" <k...@yahoogroups.com>, "Drake List"
<drakelist@zerobeat.net>
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.
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Message: 2
Date: Fri, 11 Nov 2011 21:53:55 -0500
From: "Michael A. Kelly" <mkell...@gmail.com>
To: drakelist@zerobeat.net
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" <brown...@optusnet.com.au>
To: "'Michael A. Kelly'" <mkell...@gmail.com>,
<drakelist@zerobeat.net>
Subject: Re: [Drakelist] Bias Adjustment on TR4CW
Message-ID: <002101cca0f3$f1af8210$d50e8630$@com.au>
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: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of Michael A. Kelly
Sent: Saturday, 12 November 2011 1:54 PM
To: drakelist@zerobeat.net
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
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Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
------------------------------
Message: 4
Date: Sat, 12 Nov 2011 04:28:44 -0800 (PST)
From: Ron <wd8...@yahoo.com>
To: drakelist@zerobeat.net, "Michael A. Kelly" <mkell...@gmail.com>
Subject: Re: [Drakelist] Bias Adjustment on TR4CW
Message-ID:
<1321100924.98205.yahoomailclas...@web161404.mail.bf1.yahoo.com>
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 <mkell...@gmail.com> wrote:
From: Michael A. Kelly <mkell...@gmail.com>
Subject: [Drakelist] Bias Adjustment on TR4CW
To: drakelist@zerobeat.net
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
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Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
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End of Drakelist Digest, Vol 41, Issue 20
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