parody amplifier - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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
Reply
 
Thread Tools Search this Thread
Old 21st January 2013, 08:11 PM   #1
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
Default parody amplifier

the amp under question is a Quad 303

1) i take as a fact that anyone claims that this amplifier might play properly is a complete non audio related person ...On second thought it might as well be someone with extreme or unexplainable feeling of romance for cans like that . so his opinion cannot be valid in no possible way .

2) i take also as a fact that on first hand the designer had absolutely no relation with the production manager or the can designer .... then of course i take as a fact that in the can factory they produced the cans they didn't have scopes ... or even if they did it is most likely that they didn't know how to operate them

3) one may say that the can was unique when it comes to size and dimensions but other than that this cannot be called a HIFI amplifier and it seems that the target was a unique outline rather than a working amplifier .
I am pretty sure that there is no chance that they ""haven't seen """ seen or didn't notice or didn't know .A tragic example of arrogance is that actually they new but still produced the can ...

Secret lays on the wiring of the 303 where input +output +signal+plus rails +minus rails +ground +base cables +emitter cables +collector cables X times2 for left and right amplifier are tied all mixed and together producing all shorts of electrical interference phenomenon .

As about crosstalk injected from the wiring i could live with that ... as about channel separation ...might also as well .... But all this oscillation produced by the mixed wiring simply is out of any question .

The #1 thing you never do is to twist B-C-E wiring from a board to a transistor How about twisting altogether?
unbelievable !!!!

PS :
Cheerful joke for simulation people
""enjoy one more thing that your simulator cannot show you ""

enjoy pics
Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

Last edited by east electronics; 21st January 2013 at 08:15 PM.
  Reply With Quote
Old 21st January 2013, 08:25 PM   #2
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
Except for one thing, my friend.

They are out in the field for decades and apparently do work!

Maybe you lost the Miller comp caps or something like that?
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
  Reply With Quote
Old 21st January 2013, 08:37 PM   #3
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
no Bear ... try to see what will happen in your scope with both ch driven in a bit of capacitive load and a square wave .... scope goes crazy

any way you slice it its a very bad practice
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 21st January 2013, 08:38 PM   #4
FoMoCo is offline FoMoCo  United States
diyAudio Member
 
Join Date: Dec 2012
Quote:
Originally Posted by bear View Post
They are out in the field for decades and apparently do work!
Agreed.
A lot of older equipment was built this way and it works.
__________________
Account Deletion Requested: 1/26/2014
  Reply With Quote
Old 21st January 2013, 08:41 PM   #5
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
producing sound in the output yes ...work ...? not really !!
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 21st January 2013, 08:46 PM   #6
diyAudio Member
 
Join Date: Jul 2003
Location: Bath, UK
Oh yes it does; the people who built this thing really knew what they were doing. Have you spotted the output is a triple yet? And it's stable too...

The amp even has a regulated supply, but that's only because Quad judged it the most reliable and best-value way to protect the power transistors.
  Reply With Quote
Old 21st January 2013, 08:51 PM   #7
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
you can say as much as you like ...scopes never make mistakes when it comes to things like that ( things like that is not a question of opinion or choice ) things like that its simple electrical measures ...nothing else

( and by the way it doesn't look to me that a regulated power supply might provide some safety when its not needed in a low power single rail capacitor coupled amplifier on the contrary it could only provide a bit less modulation to the rest of the cables as long the power is regulated but nothing else )
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

Last edited by east electronics; 21st January 2013 at 08:56 PM.
  Reply With Quote
Old 21st January 2013, 09:02 PM   #8
dmills is offline dmills  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
Location: High Wycombe
Lots of those things doing sterling service driving small nearfields in broadcast installations up and down the country.
They do just fine.

Bear in mind that that amplifier uses some very old (And thus low Ft, low beta parts), a little wire is just not the issue it would be with modern sand.

The one thing to change is that apalling mains input connector, nothing but trouble, but that is largely a historical artifact, the amp itself works ok, and just keeps on trucking, I have seen some that have been power on for at least ten years, stuck in the back of a bay frame with no attention, the things just work.

Sure, you would design something different these days, but the thing is by no means rubbish, especially given the available sand at the time.

Those PCBs need some care if doing work, they are old enough that the adhesion of the tracking is sometimes not everything you would like.

73, Dan.
  Reply With Quote
Old 21st January 2013, 10:22 PM   #9
ief is offline ief  Netherlands
diyAudio Member
 
ief's Avatar
 
Join Date: Jun 2011
Build bad, measures even worse, people adore it, says sound great.

Some things you can't sim, others you can't measure
  Reply With Quote
Old 21st January 2013, 10:33 PM   #10
diyAudio Member
 
Kindhornman's Avatar
 
Join Date: Aug 2012
Location: Los Angeles, California
Sakis,
Perhaps it had more to do with the fact they were connected to a speaker system that you probably couldn't discern the subtle differences in in the first place?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Motional feedback amplifier based on Philips 40 wats amplifier 1970s sanbadgujar Solid State 14 13th October 2013 01:35 PM
converting PA amplifier into symetrical class A son of Zen amplifier muddasirwaheedmalik Pass Labs 5 16th October 2012 04:01 PM
An amplifier to take to University - A small low power integrated amplifier monty78pig Solid State 33 31st August 2012 06:00 AM
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM


New To Site? Need Help?

All times are GMT. The time now is 10:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2