The thing that you must realize is that ANY and ALL information (especially with photos) is helpful. Plus there hasn't been an Aleph 60 thread in quite some time.
Somebody will look through your thread and either a) be inspired and/or b) see an answer to a question that they had.
Plus, the more we have on the forum, the better chance google has to get a good result to somebody searching for that info.
Somebody will look through your thread and either a) be inspired and/or b) see an answer to a question that they had.
Plus, the more we have on the forum, the better chance google has to get a good result to somebody searching for that info.
8 Kemet(rifa peh200) 47kuf 40V
4 Icar 50uf 280V
ZM you were right, the Icar`s did came with screws and fixing nuts so I bought 4 kemet fixing nuts for nothing.I received an advice few post earlier from someone, don`t remember who, that kemet nuts would match with Icar caps but they don`t.The Icar`s screw is a little bit smaller in diameter so if you don`t know...don`t give this kind of advices
Thanks ZM
4 Icar 50uf 280V
ZM you were right, the Icar`s did came with screws and fixing nuts so I bought 4 kemet fixing nuts for nothing.I received an advice few post earlier from someone, don`t remember who, that kemet nuts would match with Icar caps but they don`t.The Icar`s screw is a little bit smaller in diameter so if you don`t know...don`t give this kind of advices
Thanks ZM
Attachments
whoa !
will write reply ......... in few days , not after NY eve
'ts time for sandwiches and moves , these days
Have you finished the sandwiches and movies yet?
complicated quota process avoided puttin' my replies in-line , in bold
OK
time for another movie ........
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
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 ...
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 ........
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?
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
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
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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 (
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
