P3A COMPARSION TABLE ( long .... ) - Page 13

wahab · 9th June 2011, 12:43 PM

Using the original schematic , the BD139/BD140 paired with 2SA1302/2SC3281
seems the best combination.

Dont forget the 100pf that is connected from base to collector of the PNP driver, though..

chlorofille · 9th June 2011, 01:21 PM

Do you know of any reliable suppliers for the 2SA1302/2SC3281 ?

Ian Finch · 10th June 2011, 10:37 AM

Quote:

Originally Posted by chlorofille

Do you know of any reliable suppliers for the 2SA1302/2SC3281 ?

I guess you know these were discontinued around 2000. On-Semi has cloned them quite successfully in about 8 versions and packages like TO247, TOP-3 etc. as the MJL3281/1302 series that retains the last three digits 281 and 302 to denote the same basic devices.

If you are trying to source NOS Toshiba product, you will be a prime target of fakes, so maybe it's better to get used to what is practically identical, and widely available?

AndrewT · 10th June 2011, 10:44 AM

If you "buy" them from ONsemi then you are guaranteed to get genuine product.

The "buy" cost is postage and packing of the samples. But you are limited to 5 off each.

chlorofille · 10th June 2011, 11:00 AM

Hi Andrew, I did a search on their website but they are not being produced anymore. MJL3281/1302 are the replacements. Jacco/Sakis have lots but they are for collection, so not selling =(

Ian Finch · 10th June 2011, 05:52 PM

I think that is what Andrew is acknowledging here and adding that there is security and benefits in dealing directly with On-Semi or its licensed agencies, such as a samples programme for qualifying individuals and corporations. Think about it....enough said?

Tekko · 10th June 2011, 11:06 PM

And your only supposed to order samples once to evaluate if it is what your looking for, if it is, you go ahead and buy the required/wanted quantity either from On Semi or a distributor like digikey, mouser or farnell to name a few.

chlorofille · 11th June 2011, 04:52 AM

Thanks for the recommendations. Not worth taking the risk and ending up with fakes.

sakis · 15th June 2011, 02:23 PM

woke up with a strange idea ...

next days i am willing to use a set up of classic P3A version ( as described in the post ) use 829-830 drivers use 2SA1169 2sc2773 sanken pairs ( kinda beefy ) got two pairs very original sanken and go with 50 volt rails while respect the amplifier and only use it strictly for 8 ohms load and casual listening ...

need to check if my LTP is happy with such a voltage
need to see if this will provide more headroom an/or anyother diference

i will do and let you know

effebi · 15th June 2011, 03:10 PM

Sakis, since you did already so much shange, I'd go for 2SC2240 for LTP, without any doubt.
bye
effebi

9th June 2011, 01:21 PM	#122
chlorofille diyAudio Member Join Date: Jul 2008 Location: Christchurch	Do you know of any reliable suppliers for the 2SA1302/2SC3281 ? __________________ Sand till the end of time

10th June 2011, 11:00 AM	#125
chlorofille diyAudio Member Join Date: Jul 2008 Location: Christchurch	Hi Andrew, I did a search on their website but they are not being produced anymore. MJL3281/1302 are the replacements. Jacco/Sakis have lots but they are for collection, so not selling =( __________________ Sand till the end of time

10th June 2011, 05:52 PM	#126
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	I think that is what Andrew is acknowledging here and adding that there is security and benefits in dealing directly with On-Semi or its licensed agencies, such as a samples programme for qualifying individuals and corporations. Think about it....enough said? __________________ regards

10th June 2011, 11:06 PM	#127
Tekko diyAudio Member Join Date: Jan 2005	And your only supposed to order samples once to evaluate if it is what your looking for, if it is, you go ahead and buy the required/wanted quantity either from On Semi or a distributor like digikey, mouser or farnell to name a few. __________________ The point of life is to build atleast one audio amplifier before you die.

11th June 2011, 04:52 AM	#128
chlorofille diyAudio Member Join Date: Jul 2008 Location: Christchurch	Thanks for the recommendations. Not worth taking the risk and ending up with fakes. __________________ Sand till the end of time


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9th June 2011, 12:43 PM	#121
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	Using the original schematic , the BD139/BD140 paired with 2SA1302/2SC3281 seems the best combination. Dont forget the 100pf that is connected from base to collector of the PNP driver, though..

10th June 2011, 10:44 AM	#124
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	If you "buy" them from ONsemi then you are guaranteed to get genuine product. The "buy" cost is postage and packing of the samples. But you are limited to 5 off each.

15th June 2011, 02:23 PM	#129
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	woke up with a strange idea ... next days i am willing to use a set up of classic P3A version ( as described in the post ) use 829-830 drivers use 2SA1169 2sc2773 sanken pairs ( kinda beefy ) got two pairs very original sanken and go with 50 volt rails while respect the amplifier and only use it strictly for 8 ohms load and casual listening ... need to check if my LTP is happy with such a voltage need to see if this will provide more headroom an/or anyother diference i will do and let you know __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

15th June 2011, 03:10 PM	#130
effebi diyAudio Member Join Date: Nov 2010 Location: Milan	Sakis, since you did already so much shange, I'd go for 2SC2240 for LTP, without any doubt. bye effebi

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