[TechAssist] Re: Philips HOT BU2508DF Mis-labeled
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: "J Silverman" <greentron@xxxxxxx>, <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Mar 2004 18:00:48 -0500
Then you need a new ohm meter...
I don't think I have ever seen a HOT with lower than 50 ohms.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "J Silverman" <greentron@xxxxxxx>
To: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>;
<techassist@xxxxxxxxxxxxx>
Sent: Wednesday, March 31, 2004 3:59 PM
Subject: Re: [TechAssist] Re: Philips HOT BU2508DF Mis-labeled
I never heard of a "too low" resistance complaint. Complaint was always that
the resistance was too high. On some HOTs the normal level is about 25 ohms.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; <greentron@xxxxxxx>
Sent: Wednesday, March 31, 2004 9:57 AM
Subject: Re: [TechAssist] Re: Philips HOT BU2508DF Mis-labeled
> If the resistance is too low, same thing.
> Ideal resistance should be in the 60-70 ohm range.
>
> Jeff Dougherty
> Intrepid Video TV/VCR
> 263 S Front St
> Steelton PA 17113
> fax...717-564-4952
> www.intrepid-video.com www.tech-repair.net
>
> ----- Original Message -----
> From: <greentron@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Cc: "Corey Brazell" <cohbraz@xxxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, March 30, 2004 10:42 PM
> Subject: [TechAssist] Re: Philips HOT BU2508DF Mis-labeled
>
>
> Those are counterfeit. Regardless of what other differences there are,
they will burn out quickly without
> the resistor. The resistor damps parasitic oscillations and has to be as
close to the junction as
> possible, which is why they are fabricated internally. No distributor
intentionally ships counterfeits but
> we hear about this thing all the time. Some techs keep a list of the
resistor measurement for a given type
> of hot and check all of the new stock against the list. If the resistor
value is more than 20% above the
> nominal value, they know from experience that the hot wont last.
> J Silverman
>
>
> > That's what it said on PartSeeker, but when I ordered it, it subbed to
that
> > BU2508DF.
> >
> > Regardless, any BU2508DF should have the dampening diode and biasing
> > resistor; I have several older BU2508DF that do and read 40 ohms. But,
> > these new ones that I ordered that all have the same date code not have
> > that resistor. There is around a 2 Meg Ohm resistance between Base and
> > Emitter.
> >
> > So, I have two different BU2508DF transistors. Older ones that are
correct,
> > and newer ones that do not have the biasing resistor.
> >
> > Also, I just noticed that the new DF's don't look the same as the older
> > ones. It looks like they have been re-stamped. The front of these look
as
> > if they have been fine-sanded to a smooth even surface and then stamped.
My
> > older DF's Have three round indentions on the front face. One in the
middle
> > near the bottom, and two toward the top near each side. These new ones
are
> > smooth all the way across. As a matter of fact, I have one that is
stamped
> > on both sides!
> >
> > Corey Brazell
> > Audio Video Electronics
> > 12169 SC Hwy 121
> > Newberry SC 29108
> >
> >
> > > [Original Message]
> > > From: Intrepid Video Support <support@xxxxxxxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Date: 3/30/2004 3:29:48 PM
> > > Subject: [TechAssist] Re: Philips HOT BU2508DF Mis-labeled
> > >
> > > Corey,
> > > Thanks for the information, but that part number is for Philips S2055,
> > 610597
> > >
> > > Jeff Dougherty
> > > Intrepid Video TV/VCR
> > > 263 S Front St
> > > Steelton PA 17113
> > > fax...717-564-4952
> > > www.intrepid-video.com www.tech-repair.net
> > >
> > > ----- Original Message -----
> > > From: "Corey Brazell" <cohbraz@xxxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Tuesday, March 30, 2004 1:07 PM
> > > Subject: [TechAssist] Philips HOT BU2508DF Mis-labeled
> > >
> > >
> > > I have received two separate shipments of these BU2508DF transistors
from
> > > Philips, and the transistors do not have the built-in Base-Emitter
bias
> > > resistor. They seem to be a BU2508AF. The transistors in both
shipments
> > > have the same date code: 0231 C2
> > >
> > > Philips is now running a Stock Check on these parts. They may also be
> > under
> > > part number 4835 130 47897.
> > >
> > > If you have any of these type HOTs, check them!
> > >
> > >
> > > Corey Brazell
> > > Audio Video Electronics
> > > 12169 SC Hwy 121
> > > Newberry SC 29108
> > >
> > >
> > >
> > >
> > >
>
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