[R-390] TIRED OF READING ABOUT CARDBOARD SPEAKERS

[Cecil Acuff]

We're about two days past too much....

I agree with the idea of a warning about problems associated with business 
dealings with folks in the business but this has gone from productive 
warning and friendly discussion to unproductive personal mortar attacks. 
It's time to agree to disagree on the topic of RM and his use of cardboard 
and fix a radio or two.

In that vein.......

I refilled the engravings on my "Blue Stripper" project radio's refinished 
front panel last night.  The panel was quite rough when I started out but 
came out pretty nicely.  I have no plans of making this a perfect radio but 
plan on using it as the test bed for evaluating all the mods floating around 
to decide which ones work for me and which ones don't so I can decide which 
ones I want to incorporate into the planned radio rebuild for the listening 
position. (a black faced Motorola in a black CY-979A cabinet)  I used a 
little different capacitor rebuild process than I have seen after having 
much trouble with the drill and tap routine to attach the new capacitor 
leads to the pins in the base of the original caps.

I cut a defective octal tube base apart to salvage the pins that I soldered 
to the new cap assemblies.  I pushed the pins into the appropriate socket 
locations and mounted the original cans minus the bases in their associated 
clamps and screwed the clamps back in place on the audio deck.  So the cans 
basically float over the new cap assemblies that are plugged into the octal 
sockets on the audio deck.  Looks completely original once the module is 
back in the radio and I can re-enter the caps at any time to make changes. 
I think the next one I do I will cut the original cans lower around the 
crimp and it will look even more authentic once reinstalled.

Just another way of doing the cap job that will make it easier to go back 
in.  All leads are insulated with Teflon tubing so nothing electrical 
exposed to get against something it's not supposed to!

I plan to put the panel back in place today and begin the turn up and 
alignment.

The other mods already done to this radio include replacement of the 
selenium rectifier with a silicon bridge, 12BA6 tubes and a jumper for the 
ballast tube,  a complete recapping of all paper caps using one of Walter 
Wilsons kits,  a 20 turn pot for the "S" meter zero,  solid stated power 
supply as per the military mods and an inrush current limiter for a softer 
start.

All of the various controversial stuff discussed on the list from time to 
time....but none of the above conspire to do near the damage to the radio 
than the government had already attempted to do by having them out in the 
weather for an extended period.  Most of which I feel I have reversed.

I expect it to be a nicely performing radio before any additional 
performance enhancing mods are done.  The gear train sure is slick and feels 
wonderful.  Very easy to tune both Khz and Mhz!

What are some of the other group members current winter time projects.....

We'd love to hear about them!

My next challenge will probably be an SP-600VLF that needs caps under the RF 
deck and every tube socket replaced.....sounds like fun don't it!  HA!

Keep it FUN guys...that's why we do this!

Cecil Acuff
WB5VCE


----- Original Message ----- 
From: "Jack Absalom" <kf4yio at charter.net>
To: <r-390 at mailman.qth.net>
Sent: Saturday, January 14, 2006 10:34 AM
Subject: [R-390] TIRED OF READING ABOUT CARDBOARD SPEAKERS


> Hey Guys
>
> Do you think we could return to some more R390/R390A related topics?  This 
> is getting to be too much
>
> Jack
>
>
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