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Antique Radio Technical Forum
Filter Cap Ground Connection Wilcox Gay 1J10

Posted by Bill VA on 03/30/2009 21:12

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:Relevant to this attached Weeeeeel –Cox Gay info:
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: I initially put the [YELLOW] circle markups on, to point out those
:C5 and C6 .01. . . .Black-body-Black-tip-Orange- Spot. . . hollow tubular ceramic capacitors with their radial leads.
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:Those leads are being wrapped around akin to the same manner in which old dog-bon-i-fer resistors used it in interfacing to the resistive block. In these caps construction, they can solder onto the tinned external coating and then have an insulative over coating of paint.
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:There is also a good view of that style of ceramic cap at the top of the unit, also [YELLOW] circled.
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:Looks like you might have to positively confirm the number of those combo res-cap units for us.. . . I seem to be seeing 5
:units. . . .of which I can certainly NAIL two units in the [RED] markups, and the other units numbers are not having their
:numbering visible, you can further confirm and assign those three units.
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:On the units “tweet filter”, what you are having there is two ceramic caps (C7-8), externally side by side, with their common
:ground connection being in the center of the external unit and an enclosed 47 K (R7) resistor, as is being shown.
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:That was the center unit of the three red enclosed units illustration.
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:The next illustration to the right is the plate load resistor and HF bypassing capacitor for the plate of the 6AT6 1st AF amp.
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:Now. . .you confirm the last three. . . . all ‘ya gotta’ do is track down their wiring node termini, with that [ORANGE] referenced unit to
:the right, possibly being the coupling unit of audio to the 1st Grid of the unit AF output.
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:If that actually is one of those type of units up near the oscillator, the last [MAGENTA] marked reference is certainly close
:enough to be the RC components used in the osc 1st grid circuitry, but I suspicion the C element therein, to be different in the
:ceramic temp coefficient construction, to perform with equal or better stability characteristics. . .such as we usually see by
:the utilization of a silver mica in that application slot.
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:Read that as I would tend to leave that unit alone. . . . .IN ACTUALITY. . . .I would probably leave ALL of those units in
:the unit, if their companion resistive element is in specs .
:Plus, additionally, I would also conduct a DC leakage test on the capacitive elements. Those types ceramics are QUITE trouble
:free, in that respect.
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:The only other enclosed referencing is the Canned Electrolytic cap, which. . . . . . .as Sir Bill also said . . . . . .is using Post
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:Neanderthal------Pre Cro Magnon schematic symbolization, akin to a wet cell electrolytic.
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:One section being on the B+ and then one unit on the Sub-B+ and then one on the Sub-Sub B+, with the final lower voltage rated
:unit, being used for the cathode bypassing of the Audio Output amp.
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:Hmmmmm, I see that unit seems to be using one of those HEAVY duty " Mour Pole Fotors".
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:73's de Edd

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:WILCOX-GAY INFO:
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If this comes thru LARGE enough...it's the SAMS schematic dated 3-51. Sent to Bob.
Bill



Filter Cap Ground Connection Wilcox Gay 1J10 
Bob E. 03/28/2009 23:39 
Bob E. Here is the Questions 03/28/2009 23:50 
Peter G. Balazsy 03/29/2009 01:23 
Bob E. 03/29/2009 13:14 
Here "Are" the remaining questions..any  03/29/2009 15:55 
Bill VA 03/29/2009 20:26 
Bill VA 03/29/2009 20:32 
Bob E 03/29/2009 21:59 
Bill VA 03/30/2009 00:33 
Bob E. Hey Bill Follow up :O) 03/30/2009 01:00 
Jon 03/30/2009 06:44 
Bill VA 03/30/2009 11:31 
Bob E 03/30/2009 15:11 
Bob E. 03/30/2009 09:27 
Marv Nuce 03/30/2009 00:43 
Ceramic Caps 03/30/2009 08:55 
Bob E. 03/30/2009 09:11 
Edd 03/30/2009 19:27 
Bill VA 03/30/2009 21:12 
THANKS! Edd and Bill !! 03/30/2009 23:29 

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