Re: Ampliphone Deflection Resistors Two Questions

From: Pat Danis <patdanis_at_verizon.net>
Date: Thu Aug 25 2011 - 18:51:50 EDT
They are a little cheaper here in quantities:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=005-1.5&FTR=1.5%20ohm%20non-inductive%20resistor


Pat

On 8/23/2011 8:35 PM, William Boucher wrote:
Can you tell if the 12k resistors are newer than factory (as in someone has replaced them before) ?  The bill of materials says 1.2k.  The scanned pdf schematic says 12k but it could easily be a case of a lost decimal dot.  You know what scans are like.  I don't own an Amplifone so I can't go look at it.  However, the 1.2k would make more sense when compared to the 1.6k (R72) which is the same function part for the X amp.
 
Regarding R6, R29, absolutely yes to being N.I.  They are the current sensing resistor for the closed-loop current regulation.  An inductive part will delay the loop and give the picture the shakes.
Here is a suitable part:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MRA12-1.5-ND
 
 
 
 
William Boucher
http://www.biltronix.com
----- Original Message -----
From: Malcolm Mackenzie
To: Vector List
Sent: Tuesday, August 23, 2011 6:35 PM
Subject: VECTOR: Ampliphone Deflection Resistors Two Questions

Hey all,

Rebuilding some Amplifone deflection boards and I notice that all the documentation I have says R14 should be 1.2K, but both the boards I'm working on have a 12K in that spot.  I find it interesting that the corresponding resistor on the other side is the 1.6K as the manual states.  Any thoughts on what I should use there? 

Secondly, R6 and R29 are missing on the boards.   The manual specifies wire wound, but doesn't say whether they should be non inductive or not.  I though I recalled the resistors on the WG6100 that perform the same task are non inductive.  Will it matter if I use plain old ceramic wire wound?   Thanks -Malcolm
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