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Old 16th April 2001, 03:09 AM   #1
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HI all,


can I subsitute tr 2SA1302 + 2SC 3281 with 2SA1493 + 2SC5200

what is the substitute for MJE 15030 and 15031
Many thanks for the reply.

sorry my bad.... the tr should be 2sa1943.
how bout 2sc2922 and 2 sa1216 or its bigger brother (300w device)
can it replace sa1302 and sc3281?
please enlightened me on the secret of tr substitution?
what should I look carefully...


please bear with me....
I'm a diy novice and have about zero know how in circuit designing or trouble shooting
miracoulusly though I've built JLH 15W class A (still some hum issue and oscilation from the psu) and a kit power amp using mj 15003 and mj15004

another question
my next project will be the ESP 60 w ( http://www.sound.au.com/project3a.htm )
if I want to paralleling the o/p tr
should i add the emitter resistor to supply voltage or collector resistor to output ?

Thanks alot for your kind attention


[Edited by dexter on 04-16-2001 at 06:19 PM]
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Old 16th April 2001, 05:39 AM   #2
grataku is offline grataku  United States
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dexter,
yes, but the case is different and the complementary for the 2sa1493 is the 2sc3857 not the 2sc5200.
I don't know about equivalents for the MJE's.
All the transistors you are looking for are available in the US.
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Old 16th April 2001, 08:57 AM   #3
Geoff is offline Geoff  United Kingdom
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There appears to be some finger error here. I assume that the 2SC1493 in the original query should have read 2SC1943. The Toshiba manual specifically quotes the 2SA1943/2SC5200 as direct replacements for the 2SA1302/2SC3281 (the case size is the same - TO3-P(L)).

Geoff
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Old 16th April 2001, 09:46 AM   #4
Geoff is offline Geoff  United Kingdom
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The MJE15030/MJE15031 are high power/high frequency driver transistors. Depending upon the application, there are a number of substitutes. Assuming that you are looking for drivers for the 2SA1943/2SC5200 then suitable alternatives would be Toshiba's own drivers, either 2SA1837/2SC4793 or 2SA1930/2SC5171. These have the same case (TO-220) as the MJE devices. The 2SA1930/2SC5171 have a higher current rating (2A) than the 2SA1837/2SC4793 (1A) and are nearer to the rating of the MJE15030/MJE15031 (4A).

Geoff
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Old 28th April 2001, 09:40 AM   #5
ppl is offline ppl  United States
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Check out the 2SA1006 & 2SC3336 TO-220 types thay are used as drivers in the Mark Lev #23
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Old 29th April 2001, 02:53 PM   #6
grataku is offline grataku  United States
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This thread seems to be the appropriate place were to post this link, that maybe is old news:
http://www.pitt.edu/~gszekere/trans.txt
It appears to conver all the basics, too bad there is no Hfe.
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