[R-390] R-390A ballast replacement

[G4GJL]

I built it on Dr Gerry's advice. Easy to construct and fit in the available 
space, but no noticeable difference in performance.

A good unit to build if you cannot get the original tube.

Pete
G4GJL




----- Original Message ----- 
From: "charles bolland" <ka4prf at peoplepc.com>
To: "R-390 R-390 R-290" <r-390 at mailman.qth.net>
Sent: Saturday, February 12, 2005 2:32 PM
Subject: [R-390] R-390A ballast replacement


> Hi all,
>
> Yesterday I went to the archieves and found a circuit diagram for a 
> ballast
> replacement by K0CQ.
> It has as it's main componenet the  LM317T.  I was wondering if anyone 
> build
> this circuit and if so, are they still using it in place of a ballast 
> tube?
> Is it an improvement as stated in the building instructions?   Other
> comments?
>
> Thanks
>
> Chuck
> KA4PRF
> ka4prfnospam at peoplepc.com
>
>
>
>
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