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Old 9th June 2011, 01:43 PM   #121
wahab is offline wahab  Algeria
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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..
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Old 9th June 2011, 02:21 PM   #122
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Do you know of any reliable suppliers for the 2SA1302/2SC3281 ?
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Old 10th June 2011, 11:37 AM   #123
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Quote:
Originally Posted by chlorofille View Post
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?
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Old 10th June 2011, 11:44 AM   #124
AndrewT is offline AndrewT  Scotland
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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.
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Old 10th June 2011, 12:00 PM   #125
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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 =(
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Old 10th June 2011, 06:52 PM   #126
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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?
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Old 11th June 2011, 12:06 AM   #127
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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.
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Old 11th June 2011, 05:52 AM   #128
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Thanks for the recommendations. Not worth taking the risk and ending up with fakes.
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Old 15th June 2011, 03:23 PM   #129
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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
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Old 15th June 2011, 04:10 PM   #130
effebi is offline effebi  Italy
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Sakis, since you did already so much shange, I'd go for 2SC2240 for LTP, without any doubt.
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