Hi,
The MJE1503x have a much higher SOA than 968. This allows lower impedance loads to be driven.
968 would probably do if you were to only drive severe 4ohm speakers. If one were to drive moderate 1ohm or severe 2ohm speakers then I suspect that the 968 would become unreliable.
The MJE1503x will drive 1ohm all day to any level.
The MJE1503x have a much higher SOA than 968. This allows lower impedance loads to be driven.
968 would probably do if you were to only drive severe 4ohm speakers. If one were to drive moderate 1ohm or severe 2ohm speakers then I suspect that the 968 would become unreliable.
The MJE1503x will drive 1ohm all day to any level.
I have some 2sc3421/a1358, can I use these as pre drivers, vce0 is 120V and hfe is around 100. The dissipation and voltage is a little lower than the 2238&968, but it should be ok in this application?
Ah yes, I forgot that the KSA100 was initially designed specifically to drive Apogee Stages that have 1ohm impedance.. so for most people with sensible speakers the driver variety is much larger.
no,thomasfw said:
the MJE1503x is a driver, almost heavy duty.
The latest 15034/5 has much higher SOAR and is capable of driving very low impedance loads when used with a high gain output device.
From the few samples I have from Onsemi there seems to be a disparity in hFE between the lead free and the older version.
Has anyone else found this or are better matches available for the newer lead free?
http://www.diyaudio.com/forums/showthread.php?postid=1322622#post1322622
The schematic of Krell's class AB subsidiary should be interesting for the Toshiba versus On pre-driver and driver talk.
http://www.diyaudio.com/forums/showthread.php?postid=1348156#post1348156
(also authenticates the original ksa50 schematic, read VAS compensation C value)
http://www.diyaudio.com/forums/showthread.php?postid=1348156#post1348156
(also authenticates the original ksa50 schematic, read VAS compensation C value)
Hi,
Sorry !I am really so lazy !
Can anyone tell the 2SC2275 can match the A968 and use it in the pre-driver !!!!
Sorry !I am really so lazy !
Can anyone tell the 2SC2275 can match the A968 and use it in the pre-driver !!!!
Heatsinks
Gentlemen
Some of you might remember that I was looking for some fanblock heatsinks a week or two ago to simply do a easy swop of the amplifier module in my existing KSA100 without having to dismantle everything. In the back of my mind I was also on the lookout for a good amp carcass that can can be used for the 100.2 clone. My experience with the local metal shops has not been that positive and I want an amp that also looks good.
The outcome of my search was that I ran across an KSA150 of which one channel is overheating and low and behold another KSA arrived at my house yesterday....
Jozua
Gentlemen
Some of you might remember that I was looking for some fanblock heatsinks a week or two ago to simply do a easy swop of the amplifier module in my existing KSA100 without having to dismantle everything. In the back of my mind I was also on the lookout for a good amp carcass that can can be used for the 100.2 clone. My experience with the local metal shops has not been that positive and I want an amp that also looks good.
The outcome of my search was that I ran across an KSA150 of which one channel is overheating and low and behold another KSA arrived at my house yesterday....
Jozua
Attachments
Another project
Harry
Some guys send flowers to their girlfriends and not long afterwards there is bambino to show. I don't know what I doing but my the "courtship" brings me amplifiers...
Jozua
Harry
Some guys send flowers to their girlfriends and not long afterwards there is bambino to show. I don't know what I doing but my the "courtship" brings me amplifiers...
Jozua
Hi Jacco,
that Aragon circuit you mention above certainly looks similar to the KSA50 amp. PWatts' description of the original KSA50MkII is also similar to that circuit.
Is the Aragon amp newer than the KSA100MkII and the KSA50MkII amps?
Hi Jozua,
when you have time can you please measure the voltage across the zener diode in the original KSA50MkII - but don't short anything out.
Thanks
that Aragon circuit you mention above certainly looks similar to the KSA50 amp. PWatts' description of the original KSA50MkII is also similar to that circuit.
Is the Aragon amp newer than the KSA100MkII and the KSA50MkII amps?
Hi Jozua,
when you have time can you please measure the voltage across the zener diode in the original KSA50MkII - but don't short anything out.
Thanks
Mondial was founded in 1986, Mr d'Agostino designed the MKI Aragon power amps in 1987, both models were introduced overhere in '88.
The later MKII 2004/4004 were designed by Mr Kusiak, who joined Mondial in 1990.
The later MKII 2004/4004 were designed by Mr Kusiak, who joined Mondial in 1990.
Wow, they are only .43C/W? Are they made of plastic?
Seriously, where did you find them - they would be perfect for my little project...
Seriously, where did you find them - they would be perfect for my little project...
john65b said:
Got them on eBay. Seller had 4, I snagged 2 of them
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330157426031