[R-390] Rebuilding a R-390A IF Deck

[Robert Moses]

'If it ain't broke don't 'fix' it.' If you do then you may get to learn 
about some truly challenging repair tasks! (wafer switches, binding 
posts, p.c. boards, etc.)

Ken Harpur wrote:

>Good Evening List,
>
>I have started restoring one of my R-390As....so far I've rebuilt the Audio Deck and have now turned my attention to the IF Deck and I was wondering what the general thoughts are on the list as to resistor and capacitor replacement. I have Cornell-Dublier silvered Micas and SBE 716 series going in and have a full set of resistors arriving from Mouser. Obviously all the paper caps are going to be replaced and the Micas are sometimes problematic so my idea was to go ahead and replace all the caps with the long term view of never having to worry about them again.
>
>My conundrum is with the resistors...I measured every one and about 40% of them are on, about, or just over 10% of their marked value so I figured I'd go ahead and replace those ones..apart from those that were at the edge of their tolerance when new my way of thinking is that they will just go even more out of spec over time. But what about the ones that are still well within their 10% tolerance? Is it reasonable to assume that if they haven't drifted out of spec by now they probably never will? Or do you guys think that in time they could be candidates for trouble/replacement if left alone?
>
>Any advice, thoughts or tips would be greatly appreciated as I want to make sure I do it right the first time!
>
>Best Regards,
>Ken
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