[R-390] 6AQ5 Mod??

[Philip B Atchley]

Hello All.
Working on the 2nd R-390A (Dons machine).  It has one dead and one very
very weak 6AK6 in the audio section (explains why the Line audio didn't
work.

I remember last time I rebuilt a R-390A I subbed 6AQ5's for the audio
output stages.  If I recall correctly all it entailed was changing the
wiring on a couple tube pins (which I can figure out from the tube
manual).  Checking around I no longer seem to see this mod on the web.

If I recall correctly, the advantage was increased audio output. 
Downside was somewhat higher filament current which I think the Xformer
can probably handle ok.  What I DON'T remember is if the cathode resistor
needed a change in value??? 

As I have some 6AQ5's and no longer any receiver that used them I thought
I could save my limited stock of 6AK6's for the IF section.

Thoughts?

73 de Phil  KO6BB
Loving home provided for wayward Boatanchor Receivers
ko6bb@juno.com
Merced, Central California
37.18N  120.29W  CM97sh

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