[TechAssist] Re: Philips Magnavox TP3681C101 chassis 36D700-7570
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 20 Nov 2002 10:12:28 -0500
Thanks guys. Normally I would agree and I am very careful when adjusting
values that might affect high voltage or deflection currents. That is why I
asked for comments. In this case the circuit does not seem to depend very
much on the caps for tuning. This I thought was interesting. It runs with
no noticeable change in width or amplitude of the collector output with a
larger cap or with a smaller value in circuit. I do notice a bit of noise
riding on the output waveform that is absent with either cap in circuit,
which is why I would characterize its application as a bypass. Seems like a
pretty stable design & thought it would make for interesting discussion.
We often discuss the issue of using original parts and most of us agree that
it is best to do so. I am one who generally does. I also like to
understand the circuit designs and their behavior and do not assume that the
original part is always the only acceptable solution, or even the best
solution in every case. Better understanding often requires going "outside
of the box" or experimenting.
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 19, 2002 3:31 PM
Subject: [TechAssist] Re: Philips Magnavox TP3681C101 chassis 36D700-7570
>
> Thats not a bypass capacitor. Its part of the resonant flyback circuit. It
> affects the horizontal sweep width and the amplitude of the high voltage.
> Sometimes two capacitors are used in parallel so that if one opens the
other
> one is still there to limit the high voltage.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> 864 232 3889
> Fax 271 2080
> mailto:greentron@xxxxxxx
> ----- Original Message -----
> From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, November 18, 2002 4:03 PM
> Subject: [TechAssist] Re: Philips Magnavox TP3681C101 chassis 36D700-7570
>
>
> >
> > Thanks,
> >
> > The way I figure it, a 2200 pF cap bypassing a HOT collector to ground
> > should pass the same noise as a 1200 pF cap + some slightly lower
> > frequencies, nowhere near the horizontal output range. As long as the
> > waveform is stable, well timed, the cap isn't getting hot, and the
voltage
> > rating is the same, it should be an acceptable sub, actually a better
> part.
> >
> > Normally, I would not substitute this part, but Tritronics (who I
normally
> > use for parts) doesn't have it in stock. Vance Baldwin does, but at
$2.95
> +
> > shipping for the cost to get it, I'll give the customer the option when
I
> am
> > confident my sub is going to be reliable.
> >
> > Any comments?
> >
> > Leonard G. Caillouet
> > Service Manager
> > Electronics World
> > Gainesville, FL
> > 352-332-5608
> > 352-332-5668 (fax)
> >
> > ----- Original Message -----
> > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, November 18, 2002 2:56 PM
> > Subject: [TechAssist] Re: Philips Magnavox TP3681C101 chassis
36D700-7570
> >
> >
> > >
> > > Philips Force 32 for THAT particular model indicates 2634 is N/U (not
> > used).
> > > 2633 is listed as a 1200pf, 10%, 2KV, ceramic, part# 202055890488.
> > >
> > > Bob Waterman, CET® #RI-28
> > > Master Technician License #9109
> > > Service Manager
> > > Gemini Computer, TV, & Security Alarms
> > > (508)695-7302
> > > (508)695-7769 FAX
> > > geminitv@xxxxxxxxxxxxxxxx
> > > geminitv@xxxxxxx
> > >
> > > ----- Original Message -----
> > > From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, November 18, 2002 2:40 PM
> > > Subject: [TechAssist] Philips Magnavox TP3681C101 chassis 36D700-7570
> > >
> > >
> > > >
> > > > Need value or part number for bypass cap on HOT collector to ground
> > > numbered
> > > > 2633 or 2634. Cap is charred and the location number is unclear.
> > > Installed
> > > > .0022uF/2kV ceramic and output waveform looks clean, solid & cap
does
> > not
> > > > get hot, timing of output waveform is good. I think this should be
a
> > good
> > > > value but would like to confirm it.
> > > >
> > > > Leonard G. Caillouet
> > > > Service Manager
> > > > Electronics World
> > > > Gainesville, FL
> > > > 352-332-5608
> > > > 352-332-5668 (fax)
> > > >
> > > >
> > > >
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