[AMRadio] Distorted Valiant Audio

[Jim Wilhite]

Rob's suggestion is a good one.  About once a year I remove the covers and 
cases of my equipment and inspect it for anything amiss.  I also take the 
time to clean things off so you don't build dust bunnies that can cause 
arcs.

As to your problem, you may have a tube gone bad.  First be sure all your 
switches are set correctly then if it still has the problem try changing the 
tubes one at a time to see if you have one that is weak.  I had the same 
problem with a Globe King 500 one time and the rectifier tube for the 
modulator section went soft.  If tube replacement is not the answer then 
you can do some voltage measurements,

Jim
W5JO

----- Original Message ----- 
> I'd start out by just leaving it on for a couple of days and try your
> test again.  Always do the easy things first.  I've had problems with
> unused gear gradually go away by merely leaving them fired up for a
> few days.
>
> This may be a wives tale but with vintage gear, I try to run
> everything for a few hours every few weeks even if I don't use it all.
> I just turn everything on and leave it for a while.  I even do it
> with modern equipment.   I've heard too many stories that begin with
> something like, "I fired up my xyz after not using it for a year and
> it went pffft and smoke came out."
>
> 73
>
> Rob
> K5UJ
>
> On Sat, Feb 2, 2013 at 7:25 PM, Paul Baldock <paul at paulbaldock.com> wrote:
>> I turned my Valiant on today after many months of not using it, to hear
>> distorted audio.
>>
>> When I run a sine wave in to it,  the demodulated audio wave is not 
>> smooth
>> like a sine wave but looks more like a triangle, that is to say much more
>> pointed than a sine wave. This seems relatively independent of level and
>> frequency.
>>
>> Any suggestions?
>>
>> Thanks
>>
>> - Paul  KW7Y