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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 25th September 2013, 06:11 PM   #43631
a.wayne is offline a.wayne  United States
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Is that one of Scott's, IC's ....? ....
 
Old 25th September 2013, 06:26 PM   #43632
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Could be, today, but NOT in 1968.
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Old 25th September 2013, 06:45 PM   #43633
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John,

Don't R4 and R5 wreak heavoc with your psrr?
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Old 25th September 2013, 06:46 PM   #43634
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These are simplified schematics.
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Old 25th September 2013, 10:15 PM   #43635
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Originally Posted by john curl View Post
Hopefully, today's up-in-coming audio designers will make their own 'discoveries' that will allow 'breakthroughs' based on their open mindedness and passion for the subject.
Just backtracking for a sec, a very important breakthrough will be in people's thinking: the realisation that "big sound" is possible without all the usual negatives. I was inspired by wandering around Kenrick Sound's videos, which shows the best, and worst of what happens. Obviously, bigness is often accompanied by over the top glare, a sound which is in your face, and impossible to live with - however, when it's right then the sound is magic, the real deal.

People need to get past the idea that achieving that sort of sound is only possible with monster horn systems, equipment that's dropped off the back of the pro music guys' truck. Why PA systems are usually atrocious to listen to in domestic environments is because when listening at high levels there's no room to hide for the remainder distortion, the defects which are barely noticeable at the usual home listening levels are now enormously magnified, the problems in the system are screaming at you - such a setup is a complete non-starter.

It's all about attitude - good, big sound is possible, but it won't fall off the back of a truck, into your lap ...
 
Old 26th September 2013, 12:11 AM   #43636
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Ahhh , Where have you heard this sound frank ...... ?
 
Old 26th September 2013, 02:26 AM   #43637
fas42 is offline fas42  Australia
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I've pointed to a couple of videos over here, http://www.diyaudio.com/forums/every...teresting.html. They've managed to capture some of the essence of what I'm looking for - Kenrick has gone mad recently, taking huge numbers of videos over the last months or so. The THE BEST JBL HARTSFIELD IN THE WORLD restored by KENRICK SOUND ???????????? #7 - YouTube has a huge series with different tracks played - this still has problems with vocals but does some things very well ...

Last edited by fas42; 26th September 2013 at 02:36 AM.
 
Old 26th September 2013, 03:06 AM   #43638
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John Curl's Blowtorch preamplifier part II
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again
Negative on top John? Are these germanium designs? Silicon was in popular use in 1968. Even the Quan-Tech from then had a mix. In fact, in many places you can swap the germanium for silicon and it works fine.
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Old 26th September 2013, 04:09 AM   #43639
john curl is offline john curl  United States
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PNP transistors are always quieter than NPN transistors. This is because the BASE of the PNP is N material. The Rbb' of the PNP is usually about 1/2 the value compared to NPN transistors with similar construction.
Demian, please look up the part numbers that I spoke about. 2 types are the 2N4403 and the 2N4405.
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Old 26th September 2013, 01:39 PM   #43640
a.wayne is offline a.wayne  United States
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Originally Posted by fas42 View Post
I've pointed to a couple of videos over here, http://www.diyaudio.com/forums/every...teresting.html. They've managed to capture some of the essence of what I'm looking for - Kenrick has gone mad recently, taking huge numbers of videos over the last months or so. The THE BEST JBL HARTSFIELD IN THE WORLD restored by KENRICK SOUND ???????????? #7 - YouTube has a huge series with different tracks played - this still has problems with vocals but does some things very well ...
Ok , so you have never personally heard any of them , nor have you ever heard the sound you speak off ..
 

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