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PostPosted: 06 Jul 2011, 02:50 
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Joined: 24 Jun 2010, 00:48
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Location: Christchurch, NZ
I found that when using a higher Ft output transistor, the higher freq sounds much cleaner.
My old build used a rather slow MJL21193 - but has a huge SOA.
Fairchild 2SC5200's are much better with their 30Mhz Ft.

The classic Sanken 2SC2922's are very fast - 50Mhz.

There is another Sanken transistor - 2SC2837 which can withstand 100W, and runs blisteringly fast -
70Mhz !! :hot:

Would this be suitable for the P3A at +/- 35V ?

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PostPosted: 06 Jul 2011, 03:58 
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Joined: 06 Jun 2008, 18:23
Posts: 5134
Location: Australia
If it wasn't for transistors we wouldn't know how good tubes are.

I'm just joking. Or am I?

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Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


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PostPosted: 06 Jul 2011, 04:40 
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Mark, when I complete the casework and assembly, I will post it to you for an evaluation.
Fear the transistor! LOL

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PostPosted: 06 Jul 2011, 05:58 
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Ok curry nuts.

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PostPosted: 23 Apr 2012, 05:51 
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Joined: 15 May 2011, 19:52
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Hello,
I have built this P3A amp and it sounded so good. The vocals is so clear. The cymbals is so transparent and detailed. The bass is thunderous. Simplicity in design but superior in sonics. ;) :P
By the way I'm using these transistors (fairchild)q1q2q3=2N5551/ (ST)q4=BD140/
(fairchild) q5=KSC2073/ q6=KSA940/ (Toshiba) q7=2SC5198/ q8=2SA1941/
(fairchild) q9=2N5551
Power supply transformer 6 amps 24 volts o 24 volts>>output+33volts / -33volts DC(split supply)
diodes= bridge type FAGOR FB3500 35 amps
Capacitors 2=10,0000uf tsw / 2=4,700uf elna / 220pf,2=100pf, 3=0.1uf ceramic caps
Speakers: KLipsch / Bose 301


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PostPosted: 31 May 2012, 01:05 
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Hi, glad to like the P3A. Your description of the sound is exactly how I find it.
Can you post some pics?

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PostPosted: 07 Jun 2012, 05:04 
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Joined: 30 Dec 2011, 05:52
Posts: 11
Location: Sweden
Hi!

Im planning on building this amp, i just have a couple of questions.

For the led (d1) what kind of voltage drop should i go for?
Have you / anyone tried this with 2SA1943 2SC5200?




Greetings

Robin


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PostPosted: 07 Jun 2012, 05:17 
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Hi, a standard green LED would work fine(no ultra bright types). Not too sure about the voltage drop.
Those transistors are what I used - no problems at all. The Sankens 2SC2922/2SA1216 will give a warmer sound.
Good luck with the build!

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PostPosted: 29 Jun 2012, 01:08 
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Joined: 24 Jun 2010, 00:48
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Location: Christchurch, NZ
Build pics from gorex69ers arriving very soon. Stay tuned :D

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PostPosted: 26 Jul 2012, 01:36 
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Joined: 22 Jun 2011, 07:18
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Please tell me where is the schematic of this amp.
regards.VedMitra Sharma


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