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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Received on Tue Aug 23 21:35:27 2011
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