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> > > > **************************************************************************** > > > D> * > > > >> Classifieds! Buy or Sell! > > > >> http://sell.tech-assist.org > > > >> The Tech Address Book: > > > >> http://www.tech-assist.org/secure/tip/contact.htm > > > >> Add a Repair Tip Here, or Change/Remove your Email Address: > > > >> http://www.tech-assist.org/secure/tip/main.htm > > > >> Lost Password: > > > >> http://www.tech-assist.org and select "Lost your Login Info?". > > > >> Email Archives: > > > >> //www.freelists.org/archives/techassist/ > > > >> > > > > > > D> > > > **************************************************************************** > > * > > > D> Classifieds! Buy or Sell! > > > D> http://sell.tech-assist.org > > > D> The Tech Address Book: > > > D> http://www.tech-assist.org/secure/tip/contact.htm > > > D> Add a Repair Tip Here, or Change/Remove your Email Address: > > > D> http://www.tech-assist.org/secure/tip/main.htm > > > D> Lost Password: > > > D> http://www.tech-assist.org and select "Lost your Login Info?". > > > D> Email Archives: > > > D> //www.freelists.org/archives/techassist/ > > > > > > > > > **************************************************************************** > > * > > > Classifieds! Buy or Sell! > > > http://sell.tech-assist.org > > > The Tech Address Book: > > > http://www.tech-assist.org/secure/tip/contact.htm > > > Add a Repair Tip Here, or Change/Remove your Email Address: > > > http://www.tech-assist.org/secure/tip/main.htm > > > Lost Password: > > > http://www.tech-assist.org and select "Lost your Login Info?". > > > Email Archives: > > > //www.freelists.org/archives/techassist/ > > > > > > > > ***************************************************************************** > > Classifieds! Buy or Sell! > > http://sell.tech-assist.org > > The Tech Address Book: > > http://www.tech-assist.org/secure/tip/contact.htm > > Add a Repair Tip Here, or Change/Remove your Email Address: > > http://www.tech-assist.org/secure/tip/main.htm > > Lost Password: > > http://www.tech-assist.org and select "Lost your Login Info?". > > Email Archives: > > //www.freelists.org/archives/techassist/ > >-- > >***************************************************************************** >Classifieds! Buy or Sell! >http://sell.tech-assist.org >The Tech Address Book: >http://www.tech-assist.org/secure/tip/contact.htm >Add a Repair Tip Here, or Change/Remove your Email Address: >http://www.tech-assist.org/secure/tip/main.htm >Lost Password: >http://www.tech-assist.org and select "Lost your Login Info?". >Email Archives: >//www.freelists.org/archives/techassist/ Jorge Camboni, GY Electronics, Richardson, TX ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/