[R-390] Regulator Replacement for R-390 no more 6082's

[Roy Morgan]

On Jun 11, 2008, at 9:21 PM, Tom Frobase wrote:

> ... I built a prototype regulator several months ago. ...
> He are a few pictures http://www.kitparts.com/r390-reg/

Tom,

I looked at the pictures  Nice job for sure.

Here's a thought though:  It appears that you connect to only one of  
the 8082 sockets, and possibly to only one of the cathode  
connections.  Do you bypass the 47 ohm equalizing resistor at the  
cathode?  If not, then the whole B+ current for the radio is going  
through that one resistor.  If it's 200 ma, then the two watt resistor  
is at max rating.

Those resistors are often found drifted  high from heat from the 6082  
tubes and age.  Do check them. Suitable replacements are 5 or 7 watt  
sand resistors of the same or close value if you are going to run the  
6082 tubes.

Roy


Roy Morgan
k1lky at earthlink.net
Lovettsville, VA 20180