[R-390] drill a hole next to or just under the KC tuning

[ToddRoberts2001@aol.com]

In a message dated 5/13/2003 2:35:09 PM Eastern Daylight Time, 
ghayward@uoguelph.ca writes:


> Is drilling holes permitted or is this an unforgivable heresy?  I'm 
> still debating a couple of 9/64 hole in the rear panel to locate a
> 220 ohm Dale resistor near the B+ fuse if and when one of the 26Z5 tubes 
> dies and I have to go to silicon. I think that will be
> better (and easier) than putting it under the AF deck.  I'll repeace the 
> selenum bridge at the same time as it will have to move to
> make room for the resistor.

Hi Gord. I don't think drilling holes in an R-390/R-390A is unforgivable as 
long as they are NOT in the front panel, are mostly UNSEEN, are NICELY DONE 
and for a good practical reason, and can be REVERSIBLE. Drilling 2 small 
holes in the rear panel to hold a power resistor or perhaps to mount an 
IEC-type power connector I would not consider heresy. Drilling a hole in the 
front panel to mount a toggle-switch I would consider unforgivable heresy. 
The other thing I would add is that if making ANY kind of wiring changes to 
the radio, PLEASE leave documentation on what you did. It would be very 
frustrating for someone to bring home a radio from eBay or a hamfest and find 
several wires hanging out the side of the IF deck with no explanation. Any 
modification done to the radio should make it BETTER. Solid-stating the power 
supply with no regard to increased B+ I would consider a BAD modification. 
Adding a power resistor to bring the B+ back to normal is better, but there 
is still the question of : is it better to have full B+  instantly on all the 
tubes before the filaments have had a chance to warm up? In most cases I 
would keep the radio as the original engineers intended. A lot of design 
thought and details went into building the radios by engineers that  had a 
world of experience in all aspects of the radio. 73 Todd Roberts WD4NGG.


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---