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Old 25th April 2003, 02:26 PM   #11
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u dont whan to build something hard.... and i want to build amp from 150W RMS +....... u have some good circuit? but not hard....
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Old 25th April 2003, 02:27 PM   #12
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I recommend to use more output transistors, for +/-60V rails, to get better safety.

Sajti
For PA use I fully agree with you, but I never use them at full power at home. For speakers lower then 8 Ohm you should use more output transistors as well.
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Old 25th April 2003, 02:42 PM   #13
sajti is offline sajti  Hungary
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DJ,

the 2SC/2SA pairs OK for high power, the MJE drivers also OK for high power. The BC639/640 is OK for input stage. But You need some medium power, high voltage transistor, as VAS (Voltage Amplifying Stage). Such as MJE340/350.

With 6 output devices 200-250W is possible with +/-55-60V to 4ohms, or with +/-70V to 8ohms.

Sajti
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Old 25th April 2003, 02:57 PM   #14
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last question.... about the Elliott Sound - Project 68.....

can i us in my parts to build the "68" amp.... ?
and up the volt to +/-70V for 4 0hm us.... i will put 10 O/p devices...
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Old 25th April 2003, 03:05 PM   #15
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Hi!

One more thing about P3A: R. Elliot tends to be very conservative (that is: on the safe side) with his recommendations concerning rail voltage, transistors and heatsinking.

I would say, that if you use big enough heatsinks for all power transistors, and also for the drivers, higher rail voltage than 42V (the max according to the P3A construction guide) can be used - or lower load impedance.

Right now I use the MJ15003 / 15004 as power transistors (TO3 devices), and one pair of them is directly mounted (no L-bar) on a 0.6 C/W heatsink. Even after playing about 1 hour at 1/3 max volume, the sinks only get handwarm.

If you want to get even better power handling and/or heat dissipation, maybe you could use the biggest Sanken devices... those badass transistors have a real big surface to the heatsink and can handle a lot of power... but not very cheap...

Bye,

Arndt
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Old 26th April 2003, 07:36 AM   #16
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Elliott Sound - Project 68.........
what i need to change to get 450-500W RMS in 4 ohm ???

up the volt ? more o/p devices ? or what ?....
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Old 26th April 2003, 08:23 AM   #17
sajti is offline sajti  Hungary
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DJ

did You see this

Sajti
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Old 26th April 2003, 10:00 AM   #18
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sajti yes i see this before.....

it is very good amp... but the Project 68 - "300W" is more simple...
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Old 26th April 2003, 11:21 AM   #19
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i build this........!
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File Type: gif p68-f1.gif (10.0 KB, 825 views)
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Old 26th April 2003, 11:31 AM   #20
sajti is offline sajti  Hungary
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Looks nice!

Be carefull to use very large heatsinks, or fan. Some power ON delay, and protection would be nice too, especially if You want to use as PA amplifier.

Sajti
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