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Old 30th April 2009, 08:28 AM   #1
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Default brother of quasi /2SC3284

i found in the greek market 29 pcs of very original 2sc3284....150V 14A 125W 60mhz .....

since i connot find a complementary pair i was thinking to built a brother of quasi ....

any opinion ????

PS
you may ask what is the price i buy them
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Old 30th April 2009, 10:18 PM   #2
mjf is offline mjf  Austria
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hello sakis.
i think it is a 2sa1303.
have a look at 2sc3284 in
datasheetcatalog.com
greetings.................
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Old 1st May 2009, 12:19 PM   #3
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Default yoi missed it .....he he

Quote:
Originally posted by mjf
hello sakis.
i think it is a 2sa1303.
have a look at 2sc3284 in
datasheetcatalog.com
greetings.................


of course i know which is the number of the coplementary pair ..... only its not available in original and/or the same brand quality
thats why i am looking to built a quasi that requires only Npn transitors .....
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Old 1st May 2009, 01:13 PM   #4
AndrewT is offline AndrewT  Scotland
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I think your 3284 will suit the BJT quasi well.
2pair on +-50Vdc will drive 8ohm.
3 or 4pair will drive 4 to 8ohm.

If you lift the supply to +-57Vdc it will probably need 3pair for 8ohm duty. I wonder if 5pair could do 4ohm duty?
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Old 1st May 2009, 01:33 PM   #5
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Default thanks andrew

this what i thought also more or less ....

the only think is that i have really high expectations from these transistors ..... its the real japanese product ( it has been in stock in the particular company together with many others since the 80's)

since i had the ability to construct many amps with just a pair of transitors and 35+35 rails i can tell you this :

from all i ver made some of them cheap versions with cheap transistors some of them with very expensive ..... but between the same others parts and same pcb ...the best i ve heard was the 2SA1302-3281 ORIGINAL TOSHIBAS ....
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Old 1st May 2009, 05:51 PM   #6
mjf is offline mjf  Austria
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hello sakis.
sorry,i did not understand your text correctly.
i remember the burmester 850 and the yamaha ax550 where the toshiba 1302/3281 were used...............
they are still available from magnatec.
greetings...............
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Old 2nd May 2009, 07:45 AM   #7
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Default no way Josse !!!!!

Quote:
Originally posted by mjf
hello sakis.
sorry,i did not understand your text correctly.
i remember the burmester 850 and the yamaha ax550 where the toshiba 1302/3281 were used...............
they are still available from magnatec.
greetings...............

it cannot be the same transistor ..... i good quality fake that is possible ....
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Old 2nd May 2009, 09:40 AM   #8
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hi sakis,

The NAIM NAP140/250, NCC200 and NicAmp 135 family of amps are quasi amps and my be worth investigating.

I have collected the info on these amps if you are interested.

regards
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Old 2nd May 2009, 10:02 AM   #9
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Default Thanks !!!!

TRIPLE YES !!!!! I AM INTERESTED !!!!!

SCHEMATICS SCHEMATICS PLEASE !!!!


i lay my hands in some original stock of various transistors but they cannot be paired ..... meaning the brother of 3284 in the same quality , brand , and make ....simply can no longer be located ...

i even have mjw21194 but the 193 pair of the same make etch etch canot be located .....

so since i buy these transitors for nothing ....lets example this ....mjw 21194 will cost between 4-5 euros each in athens and the quality of it is really questionable

so if i can have the original transistor in the best of quality for 0.80 euro then i need to built quasi amps !!!!!

regards sakis ( thanks greg !!!! )



greg .... if there is any of the transistors that you would like to have please let me know .... i will be more than happy to send you )

usable transistors are these ( i got plenty more but not for outs )

2SC2578 NPN AF SWTC PWR 140V 7A 70MHz 10
2SC2921 NPN AF SWTC PWR 160V 15A 150W 25
2SC3182 NPN AF SWTC PWR 140V 10A 100W 419
2SD1049 NPN SWTC PWR 120V 25A 80W 10
2SD675 NPN AF SWTC PWR 160V 12A 100W 10
2SD752 NPN AF SWTC PWR 160V 15A 150W 11
BD245C NPN 100V 10A SOT-93 185
BDW83C NPN DARL 100V 10A SOT-93 565
BDW93C NPN DARL 100V 5A TO-220 50
MJ11015 NPN DARL 120V 20A TO-3 353
MJE340 NPN 300V .5A SOT-32 390
MJW21194 NPN POWER TRNS.250V 16A 200W 25
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Old 2nd May 2009, 10:29 AM   #10
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Default the target

is too built amps that will be with average calculations .....IE no extreme designs , no extreme power levels ,and no extreme protection ....

56+56 rails, 3-4 pairs per board and the use will be light PA applications ....

simple to make ....end expecting from it 150 W give or take but needs to be kinda stable since is to be used in PA

regards
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