I searched for a long time for led replacements for the #53 bulbs
that would give the Drake blue color and not look purple or intense
blue. Here's what I came up with
and you can't tell it doesn't have the #53 bulbs in it except I don't
have to remove the DR7 board every
other month to replace the bulb. the bulbs I use are from
SuperBrightLEDs.com part no. Warm White BA9s-WWHP6.
I then added a 220 ohm 1/2 watt resistor in series with the hot lead
on the bulb to dim it a little.
The bulbs are a BA9 base so they go right in. If the stock blue gels
are ok then the color is the same as with
the #53 bulbs. If the gel is faded I use #854 Roscolene Steel Blue.
If you hold this and the stock Drake blue
gel up to light you can't tell any difference. Now the TR7 looks like
a Drake with the proper color of blue
and the LEDs should last in excess of 100,000 hours instead of 1000
hours for the #53 bulb. The LEDs also draw
a lot less current and don't heat up the PTO. The red numbers on the
s-meter show up fine.
73, Joe KC9LAD
At 10:10 AM 4/17/2011, you wrote:
Jim,
I have both blue and red LEDs on my TR7 s-meter. Kind of works, but
leaves a red "blush" on the meter that makes the blue look
strange. "White" LEDs and blue filter didn't do so good for me
either. The B-line has less issue with only the pointer being red.
I would be interested in hearing others' experiences in trying to
recover the TR7 s-meter red with LED "bulb" replacements.
73,
Ron WD8SBB
--- On Sat, 4/16/11, Jim Shorney <[email protected]> wrote:
From: Jim Shorney <[email protected]>
Subject: Re: [Drakelist] Drakelist Digest,RE: Blue Foil Filters
To: "[email protected]" <[email protected]>
Date: Saturday, April 16, 2011, 12:04 PM
On Sat, 16 Apr 2011 11:14:53 -0400, Mike Williams wrote:
> I changed my 4C and 7 line to
>these LED kits and they look great, generate less heat and consume
much less
>power. I purchased the kits on line and they were very reasonable, try a
>search and you will find the supplier
Or, you can build your own:
<http://radiojim.exofire.net/pages/blue.html>http://radiojim.exofire.net/pages/blue.html
There is a list of kit suppliers at the bottom of the page as well. In
retrospect, I may try retrofitting a small red LED to my creation to bring out
the red highlights in the S-Meter. The monochromtic blue LEDs obliterate the
red color completely.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and he
will learn for a lifetime."
HyGain 3750 User's Group -
<http://groups.yahoo.com/group/HyGain_3750/>http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
<http://www.nebraskaghosts.org>http://www.nebraskaghosts.org
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