[R-390] RF subchassis separation

Mark Richards mark.richards at massmicro.com
Sun Mar 16 18:36:50 EDT 2014


Ken, I'm glad you pointed that out. What an interesting video!

Hope Gregory was aware of the line cord neutral safety issue.  I cringed 
when he touched chassis and other items in his shop, but he didn't, so 
maybe it was plugged in properly or he had made the needed safety mod.  
I did, including a new filter, and am glad for it.

C327 was replaced when I had the RF deck out.  V-207 just replaced.  
Still issues and I posted these just now.

Looks like I need to replace more tubes and then pull the deck..

/m

On 03/14/2014 17:40, Ken Harpur wrote:
> Hi Mark,
>
> There is a youtube video by Gregory Charvat   http://www.youtube.com/watch?v=OxSzw5d6tCM
> He has the same problem and the fix was simply a bad tube V-207 the 6AK5. I have also fixed some issues in my radios that were simply a bad tube and replacement was the cure.
> Also you might want to look at C-327 the 100pf capacitor across T-207.  In one of my radios most of the micas that had B+ on them were bad so C-327 could certainly be the culprit. I'd do the easy things first and try a new 6AK5 V-207.
>
> Regards,
> Ken



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