[TechAssist] Re: Subject: Noisey coils & Transformers


Dude1127

Exactly what I'm doing with a home made device. My curiosity was to see how
everyone else does this task, and how they correct it. I'm using an electret
microphone, with a small band band pass amp. I connect the output to the
oscilloscope vertical input. Then start looking for maximun signal.

I have not had good results with some of the new replacement coils &
transformers. They are sometimes just as noisy as the original. I remember in 
the
late 60's I went through at least 20 6JS6's before I found one that did not ring
at an annoying level. So we no longer have tubes that ring we now have
transformers and coils.

What I use is Super glue to lock the windings and cores in place along with a
nylon wire tie to tighten up the core and windings. This is tricky on flybacks
but works remarkably well on linearity coils, and certain Sony transformers in
there AP and RA1 projection receivers. Super glue has the right viscosity to
permeate into the windings far better the RTV and hot glue. (Thanks to the
individual for the definition of RTV I never knew that).

I thank all of you for your input.
Dennis Viereck





Dude1127@xxxxxxx wrote:

> Dennis
> If you can't hear it hook up a small mike to your scope to find it.,Les
>
> ----- Original Message -----
> From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, November 28, 2001 10:38 PM
> Subject: [TechAssist] Noisey coils & Transformers
>
>  Since we ran the "cleaning the video head" into the ground I have
>  another question for the group. I would like to know how all of you check
> for coils, transformers, and other  components that sometime have the
> tendency to squeal at high audible frequencies  in televisions?   The devices
> I mean are like flybacks, linearity coils, yokes  and brackets for these
> devices. Once you find, how do you correct them? By replacement or other
> tricks?   For those of you, like me, who's hearing rolls off at 7 khz and
> can't > hear these  noises, how do you detect them, and how do you know you
> have it repaired if you   can't hear these high frequencies?
>  Dennis Viereck
>
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