[AMRadio] valiant problems

[Jim Wilhite]

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" <wa4jqs at MIKROTEC.COM>
To: <amradio at mailman.qth.net>
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
>
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