[ARC5] Receiver Tube Substitution

[Richard Knoppow]

    What you describe is what was done to the set I saw for sale at a 
local swap meet. I didn't know that extreme mod had been in QST.
     My BC-779 was also modified when I got it but a much less extreme 
one. I think this was also a Lee mod because I had seen it in CQ. The RF 
and mixer stages were changed to cathode coupled triodes using 6SL7s. It 
worked but the triodes loaded the tuned circuits too much. I restored it 
to the original circuit and found it much better. I think Lee was 
impressed by some early articles by Keats Pullen. The common cathode 
approach works fine if the whole circuit is designed for it.

On 12/19/2016 9:49 AM, Kenneth G. Gordon wrote:
> On 18 Dec 2016 at 21:32, Richard Knoppow wrote:
>
>>     I corrected this, its what happens when you go by memory even though
>> I have a BC-779 and know it pretty well.
>
> Same here. I have three of them, one of which has been torn to shreds using that "Ultimate
> Super Pro" series of modifications published in QST by Lee a long time ago.
>
> Someone here said they had one too.
>
> The entire audio section ripped out and a power supply installed in its place...among other
> attrocities committed on it.
>
> Ken W7EKB


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL