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Author Topic: Mystery wire in my ART13  (Read 5071 times)
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w1vtp
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« on: April 14, 2013, 12:11:08 PM »
What the heck is this wire for.  It's just floating in the air.  

1) What's it for?

2) What do I do with it.  The nut holding it on to the feed through appears to be soldered to the stud.  So, I'm not inclined to mess with it

Al

* MYSTERY WIRE VTP-ART13(1).jpg (807.58 KB, 4000x3000 - viewed 355 times.)

* MYSTERY WIRE VTP-ART13(2).jpg (613.99 KB, 4000x3000 - viewed 430 times.)

* MYSTERY WIRE VTP-ART13(3).jpg (234.34 KB, 2560x1920 - viewed 290 times.)
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AB2EZ
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"Season's Greetings" looks okay to me...
« Reply #1 on: April 14, 2013, 12:30:47 PM »
Al

Could this be intended as one side of a neutralizing capacitor (with the nearby tube's plate being the other side)?

Stu
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Stewart ("Stu") Personick. Pictured: (from The New Yorker) "Season's Greetings" looks OK to me. Let's run it by the legal department
kb3ouk
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« Reply #2 on: April 14, 2013, 12:42:45 PM »
I think Stu is right, looks just like something I've saw in an old ARRL handbook. The wire is hooked into the grid circuit and serves as the neutralizing capacitor. To adjust it you just move the wire closer to or farther from the tube.
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Clarke's Second Law: The only way of discovering the limits of the possible is by venturing a little past them into the impossible
W8ACR
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254W
« Reply #3 on: April 14, 2013, 12:46:16 PM »
Heathkit DX-60 neutralizes the 6146 final in exactly the same way.

Ron
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K9PNP
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« Reply #4 on: April 14, 2013, 01:12:52 PM »
I've never seen a neutralizing rod/wire with a terminal lug on its free end.  Doesn't mean that this is not what it is, though.  Wonder what is connected to the other end of the feed-thru insulator???
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73,  Mitch

Since 1958. There still is nothing like tubes to keep your coffee warm in the shack.

Vulcan Theory of Troubleshooting:  Once you have eliminated the impossible, whatever remains, however improbable, must be the truth.
W6TOM
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« Reply #5 on: April 14, 2013, 01:27:25 PM »


  I have the same wire in one of my ART-13's, maybe the others too, as I have three. I believe it was used to apply B+ to the low frequency unit and if that unit isn't installed was left as you see it.


                                        Tom W6TOM
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KB2WIG
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« Reply #6 on: April 14, 2013, 01:27:42 PM »
In one of my '13, there's a piece of insulation folded over the end of the conductor, and attached to the shielding.

The 813 is on the other side of the shield........


klc
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What? Me worry?
w1vtp
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« Reply #7 on: April 14, 2013, 02:03:25 PM »
Quote from: W6TOM on April 14, 2013, 01:27:25 PM


  I have the same wire in one of my ART-13's, maybe the others too, as I have three. I believe it was used to apply B+ to the low frequency unit and if that unit isn't installed was left as you see it.


                                        Tom W6TOM

Tom - I think you may have something.  Here are a couple of clips from the maintenance manual that I have.  Quality stinks but I think that wire is attached to "E103B" on the multiplier module.

Gee. To think this was like this since the beginning.  Imagine hitting turbulance in a B29 while transmitting!!

Al

Al

* E 109 (E103B).jpg (263.31 KB, 914x614 - viewed 280 times.)

* E 109 (E103B SHOWING MULTIPLIER MODULE).jpg (220.34 KB, 986x617 - viewed 272 times.)
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N8ETQ
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Mort
« Reply #8 on: April 14, 2013, 03:53:40 PM »


It's Ep for LF VFO... Tape it up!

/Dan

* art-13 001.jpg (772.68 KB, 3648x2736 - viewed 290 times.)
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w1vtp
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« Reply #9 on: April 14, 2013, 06:33:28 PM »
Quote from: N8ETQ on April 14, 2013, 03:53:40 PM


It's Ep for LF VFO... Tape it up!

/Dan

Thanks Dan - that's certainly the clincher.  I looked and looked in the manuals that I have.  I couldn't find the E103 connection anywhere except for those points.  The schematics I have didn't really show the connection.  I have a special HV tape that I can use.  What's with that soldered cap on the screw?  Anti-corrosion or altitude arching?

I'll probably do just what you did except tape it back using that HV tape.

Al
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W6TOM
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« Reply #10 on: April 14, 2013, 06:55:36 PM »
  Pictures from an ART-13 and a ATC, the ATC has that wire laced up with the insulating cover. The Low Freq Unit was intended to plugs into the jones plug P402 in the lower left, the power resistor was to emulate the filament of the Low Freq Unit's tube.

  One of my friends just picked up two ART-13's over the weekend with the Low Freq Unit, he lives in the Sierra Nevada Mountains and has some acreage, his plan is to try the new 400 KHz band.

* LowFreqB+3.JPG (803.67 KB, 1591x1378 - viewed 286 times.)

* LowFreqB+2.JPG (1336.28 KB, 1796x1794 - viewed 304 times.)

* LowFreqB+3.JPG (803.67 KB, 1591x1378 - viewed 283 times.)
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N8ETQ
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Mort
« Reply #11 on: April 14, 2013, 09:53:49 PM »

   Hey Al,

   "SAC" mod I'm Thinking, Diff meter too..

/Dan



Quote from: w1vtp on April 14, 2013, 06:33:28 PM
Quote from: N8ETQ on April 14, 2013, 03:53:40 PM


It's Ep for LF VFO... Tape it up!

/Dan

Thanks Dan - that's certainly the clincher.  I looked and looked in the manuals that I have.  I couldn't find the E103 connection anywhere except for those points.  The schematics I have didn't really show the connection.  I have a special HV tape that I can use.  What's with that soldered cap on the screw?  Anti-corrosion or altitude arching?

I'll probably do just what you did except tape it back using that HV tape.

Al
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N8ETQ
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Mort
« Reply #12 on: April 14, 2013, 10:29:13 PM »
Hey Al ,

   Prolly no need for all that.. HV for the LF VFO is the
LV on the ART-13. 450 at best, although 550 is gud too.

/Dan


Quote from: w1vtp on April 14, 2013, 06:33:28 PM
Quote from: N8ETQ on April 14, 2013, 03:53:40 PM


It's Ep for LF VFO... Tape it up!

/Dan


I'll probably do just what you did except tape it back using that HV tape.

Al
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VE3LYX
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« Reply #13 on: April 15, 2013, 07:25:56 AM »
If you thought the post that said it is the same in the DX60B was lying he is not.
I use them all the time in my homebrew as well for neutralizing in a moderate enviornment. Where neutralizing is not a big issue but you need something. Where did I learn that? From my Dad who was a design engineer..............for Collins
Next someone will be installing a fan on the end of it and calling it a mixer!?Huh
Don VE3LYX
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Don VE3LYX<br />Eng, DE & petite Francais
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