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Old 25th March 2005, 06:04 PM   #1
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Default Pass amp with 2n3773?

Is it possible to build a Pass amp with 6 x 2n3773?

I remember peter's A5 with TO-3's but it's to long ago to remember what parts he used.
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Old 25th March 2005, 07:16 PM   #2
markp is offline markp  United States
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Why would you want to use that old transistor? Almost any newer design will be better. Its like using a 741 IC in a modern preamp!
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Old 25th March 2005, 07:26 PM   #3
Stocker is offline Stocker  United States
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Half the reason to go DIY sometimes is that you have parts onhand begging to be used. If he builds it and it sounds good, why not?
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Old 25th March 2005, 07:28 PM   #4
markp is offline markp  United States
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Quote:
Originally posted by Stocker
Half the reason to go DIY sometimes is that you have parts onhand begging to be used. If he builds it and it sounds good, why not?
If he builds it and it sounds bad he will think it's the design. Those transistors are good for stuff like power supply regulators.
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Old 25th March 2005, 08:11 PM   #5
Stocker is offline Stocker  United States
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oh come now, if he builds it and it sounds bad

...and complains about it here...

he will be roundly condemned for having used those transistors,
pestered until he changes them and admits their sound charicteristics
or goes away.

Let's be honest about the nature of the community @ DIYAudio!
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Old 25th March 2005, 08:59 PM   #6
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Guys you crack me up... Yes I have a couple and would like to use them. WOULD... if they are as bad as you say I won't.

I stepped into this quest with many questions, question 1 is about to be answerd?
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Old 25th March 2005, 10:06 PM   #7
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Hi Tassy,

I had a bag of RCA 2N3773, probably 20 years old, and just wanted to do something with them too. I just finished building a little JLH class A thing last week and my initial impressions are good.

Now I don't know which Pass amp would suit, if any, but if you are planning on a large (i.e. costly) project it doesn't make sense to risk the outcome by using ancient components.

If you want any details on non-Pass amps please PM me.
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Old 25th March 2005, 10:33 PM   #8
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Seems a DOZ (project 36) is could be an alternative but is it powerfull enough to power a subwoofer?

Guess I forgot to mention this
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Old 27th March 2005, 05:27 AM   #9
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Don't let these guys give you a hard time.

If you notice, Motorola (On Semiconductor) uses the same set of transistor curves for the MJ15024/25 which Nelson Pass used in some of the newer Threshold designs.

At 100V the 2N3773 has higher SOA than the MJ15024.

For a sub amp you should be fine.
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Old 27th March 2005, 09:07 PM   #10
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I was kind of hoping Nelson would step in and point us away from the evil DOZ
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