[TechAssist] Re: Philips HOT BU2508DF Mis-labeled

And after you go broke and your bankruptcy is over, they will supply you =

and your family with a cardboard box for shelter, all the while telling=20
you that it must have been something you did yourself because the repair =

industry is at its all time high!

Doug Keller
Wis-Kel Electronics
101 Freeland Ave.
Terra Alta, WV
USA        26764
dek@xxxxxxxxxxxxxx
dek@xxxxxxxxxxxxxxx
http://www.tech-assist.org
"Learn from the mistakes of others, because you
won't live long enough to make them all yourself"





greentron@xxxxxxx wrote:

>Dues are $240 per year and Nesdanet is $60 extra. I believe they have fi=
rst year discount on the dues for new members. As a Nesda member, we get =
access to Thomson, Panasonic, and Toshibas Web site and can download manu=
als and get technical assistance. We were getting the same thing from Hit=
achis web site but now they offer access to all servicers. Several distri=
butors offer Nesda members a extra 10% discount on parts. Nesda recently =
added a tips program and members are loading it with tips. Publishers of =
tips programs monitor the posts and occasionally toss in a free tip. Nesd=
a has a number of business aids including a downloadable form to figure o=
ut your CODB that most manufacturers accept when negotiating warranty rat=
es. A number of distributors monitor Nesdanet and respond to requests for=
 parts. Some of the major manufacturers monitor Nesdanet and provide tech=
nical assistance responces to posts involving their product. I post the s=
ame requests for assistance to three lists
>  but get responces that solve the problem more frequently from Nesdanet=
 than from the other lists. If you have a problem with a manufacturer Nes=
da will contact the appropriate people and straighten things out. Warning=
s are posted about extended service contract providers or manufacturers t=
hat are not paying claims. Being a member more than pays for itself and y=
ou get to associate with some of the most knowledgable people in the elec=
tronics service business. They have an annual convention too in places li=
ke Orlando or Los Vegas where the manufacturers provide training seminars=
 and where you can have discussions with the manufacturers representative=
s. Thats all I can think of at the moment.
>J Silverman
>
>
> =20
>
>>Nesdanet?  Is Nesda still in business?  If so, what have they done for =
you
>>lately?
>>
>>Jim McVey
>>McVey Alltronix
>>327 Broadway
>>Newburgh Ny 12550
>>ph: 845 561 8383
>>fx: 845 561 9017
>>Consumer electronics &
>>computer service.
>>Factory authorized for
>>over twenty brands.
>>----- Original Message -----=20
>>From: "J Silverman" <greentron@xxxxxxx>
>>To: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>;
>><techassist@xxxxxxxxxxxxx>
>>Sent: Thursday, April 01, 2004 2:19 PM
>>Subject: [TechAssist] Re: Philips HOT BU2508DF Mis-labeled
>>
>>
>>   =20
>>
>>>I cant argue with you as I rarely make such a measurement. I am just
>>>forwarding information that techs have posted on Nesdanet in the past
>>>concerning this problem.
>>>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: "J Silverman" <greentron@xxxxxxx>; <techassist@xxxxxxxxxxxxx>
>>>Sent: Wednesday, March 31, 2004 6:00 PM
>>>Subject: Re: [TechAssist] Re: Philips HOT BU2508DF Mis-labeled
>>>
>>>
>>>     =20
>>>
>>>>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>;
>>>>       =20
>>>>
>>><techassist@xxxxxxxxxxxxx>
>>>     =20
>>>
>>>>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 alwa=
ys
>>>>       =20
>>>>
>>>that
>>>     =20
>>>
>>>>the resistance was too high. On some HOTs the normal level is about 2=
5
>>>>       =20
>>>>
>>>ohms.
>>>     =20
>>>
>>>>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
>>>>
>>>>
>>>>       =20
>>>>
>>>>>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>;
>>>>>         =20
>>>>>
>><techassist@xxxxxxxxxxxxx>
>>   =20
>>
>>>>>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 ar=
e,
>>>>>         =20
>>>>>
>>>>they will burn out quickly without
>>>>       =20
>>>>
>>>>>the resistor. The resistor damps parasitic oscillations and has to b=
e
>>>>>         =20
>>>>>
>>as
>>   =20
>>
>>>>close to the junction as
>>>>       =20
>>>>
>>>>>possible, which is why they are fabricated internally. No distributo=
r
>>>>>         =20
>>>>>
>>>>intentionally ships counterfeits but
>>>>       =20
>>>>
>>>>>we hear about this thing all the time. Some techs keep a list of the=

>>>>>         =20
>>>>>
>>>>resistor measurement for a given type
>>>>       =20
>>>>
>>>>>of hot and check all of the new stock against the list. If the
>>>>>         =20
>>>>>
>>resistor
>>   =20
>>
>>>>value is more than 20% above the
>>>>       =20
>>>>
>>>>>nominal value, they know from experience that the hot wont last.
>>>>>J Silverman
>>>>>
>>>>>
>>>>>         =20
>>>>>
>>>>>>That's what it said on PartSeeker, but when I ordered it, it subbed=

>>>>>>           =20
>>>>>>
>>to
>>   =20
>>
>>>>that
>>>>       =20
>>>>
>>>>>>BU2508DF.
>>>>>>
>>>>>>Regardless, any BU2508DF should have the dampening diode and biasin=
g
>>>>>>resistor; I have several older BU2508DF that do and read 40 ohms.
>>>>>>           =20
>>>>>>
>>But,
>>   =20
>>
>>>>>>these new ones that I ordered that all have the same date code not
>>>>>>           =20
>>>>>>
>>>have
>>>     =20
>>>
>>>>>>that resistor. There is around a 2 Meg Ohm resistance between Base
>>>>>>           =20
>>>>>>
>>and
>>   =20
>>
>>>>>>Emitter.
>>>>>>
>>>>>>So, I have two different BU2508DF transistors. Older ones that are
>>>>>>           =20
>>>>>>
>>>>correct,
>>>>       =20
>>>>
>>>>>>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
>>>>>>           =20
>>>>>>
>>>older
>>>     =20
>>>
>>>>>>ones. It looks like they have been re-stamped. The front of these
>>>>>>           =20
>>>>>>
>>look
>>   =20
>>
>>>>as
>>>>       =20
>>>>
>>>>>>if they have been fine-sanded to a smooth even surface and then
>>>>>>           =20
>>>>>>
>>>stamped.
>>>     =20
>>>
>>>>My
>>>>       =20
>>>>
>>>>>>older DF's Have three round indentions on the front face. One in th=
e
>>>>>>           =20
>>>>>>
>>>>middle
>>>>       =20
>>>>
>>>>>>near the bottom, and two toward the top near each side. These new
>>>>>>           =20
>>>>>>
>>ones
>>   =20
>>
>>>>are
>>>>       =20
>>>>
>>>>>>smooth all the way across. As a matter of fact, I have one that is
>>>>>>           =20
>>>>>>
>>>>stamped
>>>>       =20
>>>>
>>>>>>on both sides!
>>>>>>
>>>>>>Corey Brazell
>>>>>>Audio Video Electronics
>>>>>>12169 SC Hwy 121
>>>>>>Newberry SC 29108
>>>>>>
>>>>>>
>>>>>>           =20
>>>>>>
>>>>>>>[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
>>>>>>>             =20
>>>>>>>
>>>S2055,
>>>     =20
>>>
>>>>>>610597
>>>>>>           =20
>>>>>>
>>>>>>>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
>>>>>>>             =20
>>>>>>>
>>transistors
>>   =20
>>
>>>>from
>>>>       =20
>>>>
>>>>>>>Philips, and the transistors do not have the built-in Base-Emitter=

>>>>>>>             =20
>>>>>>>
>>>>bias
>>>>       =20
>>>>
>>>>>>>resistor. They seem to be a BU2508AF. The transistors in both
>>>>>>>             =20
>>>>>>>
>>>>shipments
>>>>       =20
>>>>
>>>>>>>have the same date code: 0231 C2
>>>>>>>
>>>>>>>Philips is now running a Stock Check on these parts. They may also=

>>>>>>>             =20
>>>>>>>
>>>be
>>>     =20
>>>
>>>>>>under
>>>>>>           =20
>>>>>>
>>>>>>>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
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>             =20
>>>>>>>
>>>----------------------------------------------------------------------=
----
>>>     =20
>>>
>>>>--
>>>>       =20
>>>>
>>>>>>-
>>>>>>           =20
>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>             =20
>>>>>>>
>>>----------------------------------------------------------------------=
----
>>>     =20
>>>
>>>>--
>>>>       =20
>>>>
>>>>>>-
>>>>>>           =20
>>>>>>
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>>>>>>
>>>>>>
>>>>>>           =20
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----
>>>     =20
>>>
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>>>>       =20
>>>>
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>>>>>         =20
>>>>>
>>>>
>>>>
>>>>       =20
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