Pass amp with 2n3773?

Tazzy · 25th March 2005, 06:04 PM

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.

markp · 25th March 2005, 07:16 PM

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!

Stocker · 25th March 2005, 07:26 PM

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?

markp · 25th March 2005, 07:28 PM

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.

Stocker · 25th March 2005, 08:11 PM

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!

Tazzy · 25th March 2005, 08:59 PM

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?

Greg Erskine · 25th March 2005, 10:06 PM

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.

Tazzy · 25th March 2005, 10:33 PM

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

djk · 27th March 2005, 05:27 AM

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.

Tazzy · 27th March 2005, 09:07 PM

I was kind of hoping Nelson would step in and point us away from the evil DOZ

25th March 2005, 06:04 PM	#1
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	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.

25th March 2005, 07:16 PM	#2
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	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! __________________ If it sounds good... it is good!

25th March 2005, 07:26 PM	#3
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	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? __________________ Jesus loves you.

25th March 2005, 08:11 PM	#5
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	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! __________________ Jesus loves you.

25th March 2005, 10:06 PM	#7
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	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. __________________ Greg Erskine


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

25th March 2005, 08:59 PM	#6
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	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?

25th March 2005, 10:33 PM	#8
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	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

27th March 2005, 05:27 AM	#9
djk diyAudio Member Join Date: Feb 2001 Location: USA	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.

27th March 2005, 09:07 PM	#10
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	I was kind of hoping Nelson would step in and point us away from the evil DOZ

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A simple stereo Amp aroud a 2N3773	mjarve	Solid State	23	24th May 2011 04:08 PM
Fakes Toshiba 2N3773 photos ?	aldovan	Solid State	61	12th May 2011 05:47 AM
DIY Low Pass and Mid/High Pass (Bass Blocking) Filters	runslikealpaca	Everything Else	1	19th June 2009 10:59 PM
Paging Mr. Pass, Mr. Pass pull my finger please.	khundude	Pass Labs	2	5th December 2008 04:11 AM
My opinion on Pass Labs and Mr. Pass (Nelson) himself	b_online	Pass Labs	11	21st May 2003 12:39 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read