[TechAssist] Re: HOT subs in general question
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 04 Aug 2003 01:35:21 -0500
That's quite interesting. The 2sc2539 is a 7A 1500 volts transistor,
the c5339 is very similar, a little faster and has higher beta.
Both are faster than the D188*/ D187* series (.2 vs .3ns), their gain is
higher,
The 2SC2539 and the 2SC5339 are made by Toshiba, the D188* by
Sanyo
By the way, the 2sd2580 by Sanyo, seems worth giving
it a try as well, just take a look at the data sheet at the
Sanyo or B&D website.
you have a fine week
Jorge
At 01:27 a.m. 04/08/03 -0400, you wrote:
>I just repaired a Panasonic 32" model CT-3269SCW which required a HOT.
>Because these posts about HOT subbing were currntly on the list, I
>decided to experiment a bit. The original HOT was a 2SD2539 which is
>rated 5A, 1500V with a damper internal. I first tried a generic 2SD1880
>(8A?) and after an hour running the set, the temperature on the heatsink
>directly above the HOT was 49 deg. C. The I tried a generic 2SD1879
>(6A). After an hour, the temp. was 53 deg. C. Then I tried an OEM
>Panasonic 2SC5339 which is the new generation replacement for the
>original 2SD2539 in the set. The temp. after an hour was 44 deg. C. Then
>I installed an extra heatsink at the top of the HOT's tin plate
>heatsink. This extra heatsink was just a folded thick aluminum plate
>about 6 sq. inches altogether. The temp then went down to about 41 deg.
>C. I left the heatsink in and returned set to the customer.
>
>
>
>
>
>Gary McCartney
>
>McCartney Electronics
>7134 Fife Rd, RR 7
>Guelph Ontario Canada N1H 6J4
>Fax: (519)821-1530
>email: gary (at) number63.ca
>
>
>
>
>
>
>
>
>Damon wrote:
> >
> > Ok, I'll keep the 1879's AND the 1881's......any rhyme or reasoning on the
> > 1881's getting hot??? Example: OK on Projos, bad on 25".......Ok on any
> > brand except this brand......
> >
> > The 1881's are most likely not turning on hard enough to operate as a
> switch
> > under these circumstances.
> >
> > Damon Brunger
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> >
> > ----- Original Message -----
> > From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> > To: "Damon" <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, August 01, 2003 9:19 PM
> > Subject: [TechAssist] Re: HOT subs in general question
> >
> > > Haven't you noticed that using the D1881 when replacing a lower
> > > amperage HOT causes it to overheat? It does happen, and too often
> > > for me. That's why I stock several of the lower amp ones also.
> > >
> > > Same with the D1887 (no damper diode version). You guys do have
> > > the right idea though - Generics are the way to go (except for
> > > the counterfeits).
> > >
> > > --
> > > Best regards,
> > >
> > > Bil Green
> > > 2001 TV VCR
> > > Mammoth Lakes, CA 93546
> > > 760-934-2001 mailto:tv.vcrrepair@xxxxxxxxxxx
> > >
> > > Thursday, July 31, 2003, 5:55:46 AM, you wrote:
> > >
> > > D> Yeah, that's definitely one of them, if not the only one.....much more
> > > D> power/current handling capability than the old 2SD1879, which was the
> > MOST
> > > D> UNIVERSAL replacement beforehand.
> > >
> > > D> Now that I know the 2SD 1881 is the one to keep, I'll phase out
> the 2SD
> > > D> 1879's.
> > >
> > > D> Damon Brunger
> > > D> Telrad Electronic Services
> > > D> Ft Wayne, IN 46815
> > >
> > > D> ----- Original Message -----
> > > D> From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> > > D> To: <techassist@xxxxxxxxxxxxx>
> > > D> Sent: Wednesday, July 30, 2003 12:30 PM
> > > D> Subject: [TechAssist] HOT subs in general question
> > >
> > >
> > > >> A tech friend says if he cannot get, or ID an HOT he will sub a
> > > >> 2SD1881. Says thiis 1881 seems to be a general heavy transistor for at
> > > >> least test/estimate purposes.
> > > >> Yesterday he had a Sharp with bad HOT 2SD2586.No subs avail. OEM a
> week
> > > >> away.
> > > >> Used an 1881 and ran cool.
> > > >> I want to improve my TV HOT selection bin. Is there a certain
> selection
> > > >> that are "must haves"?
> > > >> Phil Bader
> > > >> --
> > > >> Philip Bader
> > > >> Jan Phyl TV Inc. (estab. 1976)
> > > >> 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > >> Fax (863) 299-8821
> > > >> email: tjanphyl@xxxxxxxxxxxxxxx
> > > >>
> > > >>
> > > D>
> >
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>--
>
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Jorge Camboni, GY Electronics, Richardson, TX
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