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Zen Mod
Official Court Jester
diyAudio Member

Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
complicated quota process avoided puttin' my replies in-line , in bold

Quote:
 Originally Posted by albertNL I hope someone can explain some things for me. I have been looking at the manuals (user and service) of the A3, A30 and AJ and have made some notes of the differences. I then tried to relate the differences by comparing the amps schematics, but there are too many variables for a newcomer like me to explain the specifications. I hope you guys can give me a hand. Rails are about the same: A3 and A30: 25V AJ 24V whatever Pa was in mood to write down ; take them all as typical FW PSU , based on 2x18Vac secondaries Gain: A3 20dB A30 20dB (balanced) 26dB (single ended; manual explains that A30 has 6dB greater dynamic range than A3) AJ 19.6dB (does not specify a difference between balanced and single ended) I understand the higher gain of the A30 is due to the input stage. Is this correct? 20db is practically same as 19,6db ; 20db means 10x , while 19,6db means 9,55x ; difference is probably result of convenient resistor values , with intention of staying in gain ballpark Power used: A3 and A30: Each channel draws about 100W but: A3 250W consumption A30 and AJ 200W consumption Question: If A3 and A30 both have each channel drawing 100W, should total consumption not be similar? again - different info originated from different places/instances where Pa wrote those numbers ; you can't expect of him to be serious all the time channel power draw is same thing as channel power consumption in Pa's world 50W of heat up or down is no big fuss Active output stage biased by current source at A3 slightly greater than 2 amps A30 slightly less than 2 amps AJ not given Max. output: A3 30W/8R, 60W/4R, 60W/2R A30 30W/8R, 40W/4R AJ 25W/8R, 13W/4R (Firstwatt product table) Question: What causes the difference between 4 Ohm output of A3 and A30? I assume it is the "slightly greater" and "slightly less" than 2A bias that is the cause. Is this assumption correct? Question: How come the AJ has so much lower power into 4 Ohm? I assumed that, since total power consumption is similar, bias must be similar. ask Papa to rewrite FW product table , in case of AJ difference between A3 and A30 - different Aleph CCS AC gain , I resume ( frankly - by memory only , lazy to compare schematics right now ........... again ....... and again ........ and again ... , same as different treshold for current clamp/limit - small bjt hidden around Rs in lower half of output stage Max output A3 23V 8A A30 25V 5A AJ 21V 2.5A Questions: What causes the relative large difference between A3 and A30? Are the numbers for the AJ correct? If so, why so different from A3 and A30? AJ - I think Pa mislead us with these 12,5W/4R ......... but frankly - I didn't looked too much in original AJ circ , regarding that issue - it was and still is irrelevant for my intentions whatever - it's easy to make it as "usual" - Aleph having at least 30% more power on 4 , than on 8 ohm load first , but not most important - Thanks, Albert
OK

time for another movie ........
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

 7th January 2013, 09:56 PM #1412 AudioSan   diyAudio Member   Join Date: Feb 2009 laughing my ars off. <--see *time for another movie*
albertNL
diyAudio Member

Join Date: Sep 2011
Location: Brisbane area
Quote:
 Originally Posted by Zen Mod it's easy to make it as "usual" - Aleph having at least 30% more power on 4 , than on 8 ohm load time for another movie ........
Before you start the DVD, can you elaborate?

 7th January 2013, 10:55 PM #1414 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain use most potent one (current wise) ,as basic schm , then put your fave input (probably Jfets , cascoded or not ) , adequate number of outputs ( more pairs if spks are current hungrier) , with less intrusive current limiter or toss it entirely - as is tossed in J2 Pa is trying all the time to give us a recepies , not 15 , OUPS - 10 ( ) God's Commandments ........ think of it as Lego ..... ya saw what he made of us , in F6 thread http://youtu.be/4TAtRCJIqnk __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM Last edited by Zen Mod; 7th January 2013 at 10:57 PM. Reason: reason why F series will go to no more than 10 , then G series
 7th January 2013, 11:03 PM #1415 buzzforb   diyAudio Member     Join Date: Oct 2010 Location: Burlington, NC Just saw Hobbit for second time. Wha tyou wathcing? AJ is.......was easy peasy. __________________ ...Shape the sound , Man!
 7th January 2013, 11:11 PM #1416 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain dunno - too much movies in folder something funny and easy - it's 01.00 inmy neck o' wood maybe Penelope , 2006 or Liberal Arts , 2012 __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 7th January 2013, 11:13 PM #1417 buzzforb   diyAudio Member     Join Date: Oct 2010 Location: Burlington, NC Your an armchair sleeper, occasionally waking up and watching movies and answering DIy Dodos __________________ ...Shape the sound , Man!
 7th January 2013, 11:18 PM #1418 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain sleeping is waste of time btw. tomorrow was , besides Orthodox Xmass , also 70 years of Tesla's death he was real armchair sleeper ....... __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
albertNL
diyAudio Member

Join Date: Sep 2011
Location: Brisbane area
Quote:
 Originally Posted by Zen Mod use most potent one (current wise) ,as basic schm , then put your fave input (probably Jfets , cascoded or not ) , adequate number of outputs ( more pairs if spks are current hungrier) , with less intrusive current limiter or toss it entirely - as is tossed in J2 Pa is trying all the time to give us a recepies , not 15 , OUPS - 10 ( ) God's Commandments ........ think of it as Lego ..... ya saw what he made of us , in F6 thread Moses - Ten Commandments - Mel Brooks - YouTube
Thanks Zen Mod. I am afraid I have a lot of reading to do. I will return later with more specific questions.

Albert

schultzsch
diyAudio Member

Join Date: Mar 2009
work in progress..
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