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Old 27th March 2013, 01:54 PM   #1
gto127 is offline gto127  United States
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Default Best pot for Nak PA7MKII

I'm repairing/rebuliding this NAK PA7MKII. This has been a difficult repair so far with some very unusual failures. The bias pot is very flaky and needs replacement. It's a 1k pot. I heard there are better pots than factory for this. I don't really want to go with a huge rotary pot that has to be custom mounted but would like to stay close in size to original. Any reccomendations?
Regarding unusal failures-In addition to shorted transistors I had a couple of partially shorted resistors-(not open) and a film cap that was breaking down under load. I may also need dc ofset pot but I'ts not even in service manual but just has a 51k resistor where pot was. Not sure if mine is earlier or later version(Mine has the DC ofset pot).
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Old 27th March 2013, 02:27 PM   #2
Zen Mod is offline Zen Mod  Serbia
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pics , pretty please (with cherry on top )

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Old 27th March 2013, 03:02 PM   #3
gto127 is offline gto127  United States
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Default Pic of Pot

Here's pic of both pots. Looks like they are both 1K.
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File Type: jpg IMG_4048.JPG (36.7 KB, 42 views)
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Old 27th March 2013, 03:09 PM   #4
Zen Mod is offline Zen Mod  Serbia
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pic is lousy small

whatever , put there any Bourns multiturn , or Vishay , or Spectrol

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Old 27th March 2013, 03:14 PM   #5
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Something like this will be very good!
http://www.vishay.com/docs/51025/t9.pdf
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Old 27th March 2013, 03:24 PM   #6
gto127 is offline gto127  United States
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@Zen Mod I shrunk pic because I thought there was size limit on this site. Thanks I will check out those brands.
@Lanchile-wow that's a precise pot (23 turns).
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