Exactly what I'm thinking, Richard. Now the PTO knob is stuck as I can't
get the screw out. This is starting to look like a "quickie" clean and get
it out the door.
I did dig into the underside this evening and made some interesting
findings. The PO ran shielded cable all over the place for AF signals. The
INJ jack is a low-level audio output. The ANTI VOX seems to be still used
for the purpose, but now has shielded cable and is coupled to the speaker
output by a 43k resistor. The headphone circuit was completely removed.
There are extra capacitors everywhere. The funny thing is, it doesn't
really sound all that much better than my stone-stock R-4B.
The receiver works very well and only needs a touch-up. It takes gargantuan
signal levels to get it to read S9, but it's probably the receive level and
AGC that are out, as I can hear 0.1 uV signals on all bands.
I'm figuring I'll get my money back...
73,
Steve Wedge, W1ES/4
To be is to do - Socrates
To do is to be - Plato
Do be do be do. - Sinatra
All my computers have my signature with various pearls of wisdom appended
thereto.
--------------------------------------------------
From: "Richard Knoppow" <[email protected]>
Sent: Tuesday, September 06, 2011 7:16 PM
To: "Steve Wedge" <[email protected]>; <[email protected]>; "Drake
List" <[email protected]>
Cc: <[email protected]>
Subject: Re: [Drakelist] What would you do?
----- Original Message -----
From: "Steve Wedge" <[email protected]>
To: <[email protected]>; "Drake List" <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, September 06, 2011 3:43 PM
Subject: Re: [Drakelist] What would you do?
Yep - just want to make it nice. I guess I'll find out if it helps me
get more for it. At this point, I just don't want to sell at a loss. I
still want to clean it and align it - just because I enjoy doing that. I
just won't go to great lengths. I still need to figure out what the
extra jacks are for (and why he moved the INJ jack - which defies all
logic!).
My "new" R-4B will get more TLC. That's the one with the large corrosion
spot up by the PTO. It was fun seeing what the replacement of two weak
tubes has done for it already!
73,
Its always a PITA when someone has installed unknown mods. I really
don't know the best technique for the chaissis. My T-4B is reasonably
clean and my TR-4 is very nice looking but the R-4B is pretty stained
inside. All work fine. When I worked for Hewlett-Packard a million years
ago we washed old incoming equipment. That works fine for getting dirt off
but the chassis were all aluminum so no corrosion.
There is a cleaner called Barkeeper's Friend available at hardawre and
groceries that I've had good luck with in cleaning steel and brass
materials. There is another brand, Zud, which I think is identical. Both
have oxalic acid. The cleaners with phosphoric acid like Naval Jelly and
tile cleaners seem harder to control. I am mainly worried about getting
too much moisture inside IF cans and similar places.
I suspect you should be careful of investing too much time and effort
in something you want to get rid of.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
