Anthony,
There are many possible modifications for the Valiant. A plethora of
ideas
are touched upon at the following link:
http://www.amwindow.org/tech/htm/valiantaudio.htm
Good Luck!
PS Plan on having that Valiant out of the case, and on it's side for the
next 6 months! Also beware of the last screw into the case effect. This is
when you finally think you are done, and the case gets put back on.
Somewhere along the way a screw or two got lost. Go to the coffee can full
of hardware to find replacements. You find two screws, but they are 1" long
8-32 whereas the originals were 1/2" long 8-32. At last you are done, and
you set up everything nice on the operating table making cable routing neat,
and in general the shack ready for a picture (first time in a year). You
turn on your receiver, hear W5OMR calling a CQ with an S-meter pegging
signal, and that excellent 250 TH audio. You then zero beat him with your
valiant, and when he pauses you hit the plate switch. What happens then?
Well that last screw you put in extended into the Valiant high voltage area
shorting it out. The 866's flash over pulling high current, the lights dim,
the fuse does not blow (you forgot that you replaced the fuse with a sawed
off volume control shaft), you hit the plate switch, and it doesn't shut off
because the contacts are welded on now. Finally the house circuit breaker
pops, but too late for your HV plate transformer, and 866's. They are toast.
The moral of the story here is to leave the last two screws out, and enjoy
your wonderful Valiant! :)
Regards,
Jim Candela
WD5JKO
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Jim Wilhite
Sent: Tuesday, September 23, 2003 9:12 PM
To: [email protected]
Subject: Re: [AMRadio] valiant problems
Tony:
Mouser has some 16 uf. 450 volt caps for the bias. In the same
listing as those, you will find 80s. I believe 80 is what the HV
circuit used. Part numbers are 75- TVA1803.1 for the 16s and
75-TVA1716 for the 80s. Don't know what the Thunderbolt had but
will bet you can find them at Mouser also. 800-346-6873.
As for audio mods to the Valiant, Steve W8TOW has some and there
are others that do the job. I believe I have some and will copy
to send to you if you want. Let me know. I am surprised Steve
hasn't posted his web site for you to look by now, surely he will
read your post and do so soon. If he doesn't, do a Google for
his call.
73 Jim
de W5JO
----- Original Message -----
From: "Anthony W. DePrato" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, September 23, 2003 6:05 PM
Subject: [AMRadio] valiant problems
> Well after setting for over a year . i wanted to fire the
valiant up last
> weekend.. everything went great till i keyed the relay..
HUMMMMMMM. man do
> not remember that hum in the 75A2 last time i keyed the
transmitter..
> switch the meter to MOD keyed transmitter PEG...... fuse
blows... OK... put
> in another fuse fire it up ok key dowkey antenna relay
HUMMMM... this is
> not right hi hi.... start undoing antenna . SPARK SPARK.. bad
sign... got
> the old 260 out have 60 volts a.c. to ground.. well no
wonder it
> hummmed hi.. hi.. now to find some 15 mfd 450v caps jezzz why
not just
> recap the whole transmitter while i have it on the bench... do
the Audio
> mod also... my question where was the audio mod found ? have to
get the old
> AES book out tomorrow and order the caps..
> guess i should just recap the Thunderbolt while i am at it..
> what is a good place to find HV caps ?
> fired up the HT 37 SX 115 on 40mts . and worked a few stations
running 20
> watts high power AM hi hi..
> Thanks for any help
> 73 Tony wa4jqs
>
> Anthony W. DePrato WA4JQS
> Since 1962
> WA4JQS / VP8BZL / VP8SSI / 3Y0PI
> CQ DX Hall Of Fame # 35
>
> _______________________________________________
> AMRadio mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/amradio
>
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