[R-390] R-390 progress!!

[Roger Ruszkowski]

Frank,

Awesome,

You need to go back and visit the resistors in the power supply.
You think they are resistors when in fact they are slow blow fuses.

If you over size them with some wire wound power rating, then the next time
a 6082 or 26Z5 goes bad you get crisp wire harness instead of charred resistors.
Over size sounds good. But rather than test those tubes every six months just to check,
I would let the 26Z5 and 6082 go to the end of their useful life, fry a resistor and do the 
repair and install a set of new tubes.(26Z5 and 6082).

But I would solid state the 26Z5's and get good wire wound resistors in the power supply
deck. Even do some math an consider some value larger than the original 47 ohm to drop
the B+ back so the 6082 do not have to regulate out as heat in the audio deck.

 I never liked the procedure to do the .1 and 1 KHz adjustments on the front end of the IF deck.

If you have a good counter  just run 455 into E210 and peak both of those IF bandwidths as
best you can.

You still want to run 455 at 150 UV into the IF deck and get good clean 27:1 wiggly 30:1
modulation to CW ratio at 1/2 watt on the line audio output into a 600 ohm (2 ea 1200 ohm 1/2 resistor ) load.

Until you get a clean good IF and Audio there is no need to even consider the RF section.

The glue on the slug spring to slug will work OK. We have been doing that for years.

As part of the RF clean up and adjustment, loosen the slug nut plate on the slug rack bar and let
each of the slugs float to center with the slugs all the way in the cans. This will help keep slug and spring together.

If you need a 1/2 turn or so adjustment on any slug, you may want to redo the adjustment of the nut plate alignment for 
that slug. 

Keep enjoying and thank you for the feed back updates on the project.

Roger Ruszkowski AI4NI