[TR] Triumph Bendix Radio

[John Finlayson]

I don't have a variable DC power supply but I will look into getting one. 
Trying to solve the polarity problem, I got some insight into polarity 
sensitive electrolytic capacitors from some websites, their ability to heal 
and also their catastrophic failure if hooked up wrong. Thanks for the tip.

John
'62 TR4

----- Original Message ----- 
From: "Randall" <tr3driver at ca.rr.com>
To: "'John Finlayson'" <john_finlayson at telus.net>; <triumphs at autox.team.net>
Sent: Tuesday, October 26, 2010 11:43 AM
Subject: RE: [TR] Triumph Bendix Radio


>> Now I can apply some power and see if it works.
>
> If you can, it might be best to bring the supply voltage up slowly.  This 
> is
> probably less important at 12v, but back when the B+ voltage was 150v (for
> vacuum tubes), there could be a problem with electrolytic capacitors that
> had not been used for a long time losing the thin oxide layer that forms 
> the
> dielectric.  Starting out at a lower voltage would give the layer a chance
> to reform, and reduce the odds of the capacitor failing.
>
> But it's not that big a deal, so if you don't have a variable DC power
> supply handy, don't worry about it.
>
> -- Randall