[R-390] RE: Best ballast tube resistor

Tue, 13 May 2003 08:51:42 -0400

Bill's plan is fine, except for one thing in my experience.  The piece of
wire that bridges pins 2 and 7 needs to be insulated up to the points where
it inserts into the pins.  Why?  Because in my case the wire was not rigid
enough to stay firmly in place and it leaned (or was bent inadvertently by
me) against the tube socket shield.  A nasty short to ground resulted.  So I
use a piece of insulated wire.
My 2 cents worth; YMMV.
73's,
-tom

----- Original Message -----
From: Bill Smith <[email protected]>
To: <[email protected]>
Sent: Tuesday, May 13, 2003 2:45 AM
Subject: [R-390] RE: Best ballast tube resistor

(1) Remove the VFO tube, V701 (5749/6BA6W) and the BFO tube, V501
(5749/6BA6W).   The VFO tube is underneath, in the PTO assembly, and the BFO
tube on the IF chassis,  behind the Line Meter switch.

(2) Replace each with 12BA6 tubes.

(3) Using a small piece of solid wire, make a wire jumper and install it
(plug it in) between pins 2 and 7 of the ballast tube socket.   No
disassembly, soldering or other modifications are necessary.

73 de Bill, AB6MT
[email protected]

----- Original Message -----
From: [email protected]
To: [email protected]
Sent: Monday, May 12, 2003 6:29 PM
Subject: [R-390] Best ballast tube resistor

Should I use a 39 or 40 ohm resistor to replace my bad ballast tube?

1%, 5% or 10% and what wattage?

Someone told me that if I use a resistor, my R-390A would not work properly.

What should I do?

The Firebottle
The Original
Accept No Substitutes

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