Elliott P3A US Transistors, Sources and Prices

aborza · 19th November 2002, 04:38 AM

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

Jean · 19th November 2002, 06:09 AM

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.

JensRasmussen · 19th November 2002, 07:05 AM

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

Luke · 19th November 2002, 08:01 AM

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!

Rory Christ · 19th November 2002, 10:15 PM

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

19th November 2002, 04:38 AM	#1
aborza diyAudio Member Join Date: Nov 2002 Location: Sunny Florida	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

19th November 2002, 07:05 AM	#3
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	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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19th November 2002, 06:09 AM	#2
Jean diyAudio Member Join Date: Mar 2002 Location: Sacramento, CA	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.

19th November 2002, 08:01 AM	#4
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	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!

19th November 2002, 10:15 PM	#5
Rory Christ diyAudio Member Join Date: Oct 2002 Location: Milwaukee, WI	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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