[TechAssist] Re: MIT PTV VS-5007R
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 16 Oct 2002 09:47:22 -0400
Just common sense to me. How many FBTs have you seen fail by arcing out.
They rarely short internally to the filament winding but if you have a
winding around the outside of the transformer and it decides to arc, where
do you think it might go first? Installing the isolation transformer seems
safer to me and can be done from the front of most sets. It's only a few
bucks for the part. Why not make a profit on the part and use the safer
method? Also on a three tube projector you are likely to end up with
different filament voltages by winding the FBT. For me it's as much of a
no-brainer as winding the flyback is for the guys that do it that way. Just
a difference in philosophy...
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "Kevin" <kevinstv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, October 17, 2002 4:05 AM
Subject: [TechAssist] Re: MIT PTV VS-5007R
>
> Leonard,
>
> Why do you find that winding the flyback an 'unnecessary risk and more
> trouble'? Thanks for your reply.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevinstv@xxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Leonard G.
> Caillouet
> Sent: Tuesday, October 15, 2002 7:16 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: MIT PTV VS-5007R
>
>
> Use a CRT isolation transformer. They are inexpensive and available
> from
> most suppliers. While there is generally no problem with winding the
> FBT, I
> find it to be an unnecessary risk and more trouble. Also, on a
> projection
> set, you may want to verify the voltage at the filaments to assure that
> it
> is the same on all the CRTs. The filaments are in parallel in this set
> so
> there is no need to isolate all three tubes, and the voltage should
> remain
> pretty close if you use the 1-1 winding on the transformer, but I'd
> check it
> anyway.
>
> Leonard G. Caillouet
> Service Manager
> Electronics World
> Gainesville, FL
> 352-332-5608
> 352-332-5668 (fax)
>
> ----- Original Message -----
> From: "tomlee" <t8872695@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, October 14, 2002 11:08 PM
> Subject: [TechAssist] MIT PTV VS-5007R
>
>
> > Hello members.
> > I am working with MIT VS-5007R PTV . red gun K short to heater .any
> body
> know how to bypass this or anyway to fix this.Should I use crt short
> remove?
> I have B&K470 but I do not have crt adapter .In the direct view tv I can
> make isolator heater.But this is DC heater volatge with 3guns in series
> connection.Any inputs
> > is appriciated.
> > DANG
> > TD electronics
> > 18546 sherman way
> > reseda ca 91335
> >
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