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Old 19th November 2002, 04:38 AM   #1
aborza is offline aborza  United States
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Thumbs up Elliott P3A US Transistors, Sources and Prices

Ok, I'm going to multi-amp into 4 Ohm loads and the P3A seems to be an interesting way to go. Also, I live in the US.

Yup, I have 48VCT 320VA transformers and heat sinks too. But, I need help. I can't fiqure out what transistors to use or where to get them from US suppliers.

I have contacted Elliott and he sent me to the P3A site.

I went to the P3A site. It did not even mention the front end transistors and only suggested one alternative for the drivers.

I have looked at DigiKey and cannot figure out what transistors to use for front end or drivers in the circuit. Sonics and reliability are paramount.

So the questions are:

What transistors do US residents use in the P3A for the front end, drivers and outputs?

Where can I get them them?

At what prices?

Are there sonic preferences for any transistors?

Any tweaks to the circuit for better sonics?

Discussion would be great!

Thanks

ab
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Old 19th November 2002, 06:09 AM   #2
Jean is offline Jean  United States
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Hello,

I am using BC546a that I got from www.mouser.com. I got BD139/BD140 from www.futurlec.com but now I found that www.newark.com has good prices on both 100 pack of BC546s for under $8 ! Also for the outputs I am using ON Semi MJL21193/94, since I burned two pairs of Toshiba 2sa1302/sc3281 and could not get those anymore.

Transistors are 1% metal film from www.futurlec.com, all caps are panasonic from www.digikey.com. I am using solen poly caps for the input caps, soldered one end to the rca jack and the other goes to the board.

I was reading Leach thread, and looks like MJE340/350 is another alternative for BD139/140 ? I am not exactly sure on that though.

Jean.
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Old 19th November 2002, 07:05 AM   #3
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Default BD139/40 and MJE340/50

Hi

I have used both the BD and the mje transistors in the P3A.

For higher voltages I would prefer the newer MJE devices, since the are rated at a much higher CE voltage.

good luck

\Jens
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Old 19th November 2002, 08:01 AM   #4
Luke is offline Luke  New Zealand
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Hi Aborza

http://www.anidian.com/audio/home.shtml

This is a good site for more info on building the p3a.

Check it out,

good luck!
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Old 19th November 2002, 10:15 PM   #5
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I purchased my transistors from MCM Electronics. http://www.mcmelectronics.com

BC546 $0.46
BD140 $0.96
BD139 $0.86
2SA1943 $5.63
2SC5200 $4.29

They have fairly substantial quantity discounts at 5, 10 and 30 units. I also like that you can see whether or not they are in stock before you order.

Email me if you want a spreadsheet with the parts and prices from MCM and Digi-Key.

- Rory
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