I owned a pair of Apogee Scintillas before getting the Full Range. The Scintillas sound much better using the 1 ohm connection instead of the 4 ohm connection strap option. You lose dynamics with the 4 ohm arrangement. I had a pair of Krell KMA100 monoblocks that produced a warm yet powerful soundstage. The KMA100s were one of the best amps I have owned. You still may be able to find used KMA100s.
If you want to DIY, you could build the KSA100 that is well documented on diyAudio. If you only plan to drive a 1 ohm load, I would recommend using a lower output supply voltage say 16V - 20V. You want high current with a save operating range on the bipolar outputs.
If you want to DIY, you could build the KSA100 that is well documented on diyAudio. If you only plan to drive a 1 ohm load, I would recommend using a lower output supply voltage say 16V - 20V. You want high current with a save operating range on the bipolar outputs.
1 Ohm @ only ....
Yes I have them too but they're still orig. packaged from the first buyer I buy them from, waiting for the power amps to drive them... I also have a 4 pcs. 1,2 KW toroid transformers with 34V 0 34V secondaries waiting to be used. I read a lot of various reviews and there are only a few amps to drive them as they should be driven. I know it is an illusion but maybe one day will happen the Holy-Grail from Papa to us with its X (SicCarbide) version with enough op. trs. to make us heaven here on the earth...... will pray daily ....
C. B.
Yes I have them too but they're still orig. packaged from the first buyer I buy them from, waiting for the power amps to drive them... I also have a 4 pcs. 1,2 KW toroid transformers with 34V 0 34V secondaries waiting to be used. I read a lot of various reviews and there are only a few amps to drive them as they should be driven. I know it is an illusion but maybe one day will happen the Holy-Grail from Papa to us with its X (SicCarbide) version with enough op. trs. to make us heaven here on the earth...... will pray daily ....
C. B.
This is what I'm waiting for.....😀
Please pretty please with J-fets on top?
Russellc
Sometimes I wonder if people don't think this is Do-it-for-Me rather than Do-it-Yourself.
Take an F4 or a BA2 with well matched outputs, and lots of Heat Sink, lower the Source resistors in the outputs and raise the bias to 25-30Watts/device.
That should get you started. If you want the SS SiC JFETs in the output, you will have to go even further. On the order of 2 times more medi-evil. I guess you could build a BA1 with all 6 pair in the output and high bias?
Take an F4 or a BA2 with well matched outputs, and lots of Heat Sink, lower the Source resistors in the outputs and raise the bias to 25-30Watts/device.
That should get you started. If you want the SS SiC JFETs in the output, you will have to go even further. On the order of 2 times more medi-evil. I guess you could build a BA1 with all 6 pair in the output and high bias?
Would F5, F5 V1, or F5 V2 be able to drive Apogee Scintilla or Apogee Duetta Signature?
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SUNFIRE POWER
SUNFIRE 300x2 or 600x2
1 or 2 ....
WITH THE "SCINTILLA MOD" (stable to 0.5 ohms impedance)
2000 or 4000 watts @ 0.5 ohms🙂
SUNFIRE 300x2 or 600x2
1 or 2 ....
WITH THE "SCINTILLA MOD" (stable to 0.5 ohms impedance)
2000 or 4000 watts @ 0.5 ohms🙂
+1
But if it were me I would either build the F5TV3 with 8pr/ch or
the AlephX or F4X and double the transistors😀
And don't skimp on the PSU.
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That'll do the trick.... two monoblocks would be the same size as an apartment style fridge though.
All you need are enough output transistors in parallel to be able to deliver the current required to drive the low impedance load. The trick would be keeping it in class A as this would require a lot of standing current. This isn't specifically a problem if you do not need much voltage swing and can use a low absolute number of 8 ohm watts.
Even if you are using 25-35 volt rails you will still need a lot of heat sinks!
Even if you are using 25-35 volt rails you will still need a lot of heat sinks!
Quick question what does the Scintilla mod to the Sunfire 600x2 involve?
Useful document here refers to the Krell KSA / KMA series from 80 to 400
Managed to find the information elsewhere regarding the Sunfire mod, so have answered my own question!!
I realised that this thread is quite old, so did anyone build something?
Does anyone know that the recommended amplifier of 100W for the Scintilla, is it 100W@8 Ohm(800W@1 Ohm) or 100W@1 Ohm?
I started with wanting to build a A5 clone, after going through the transformers I decided to have a 2500VA transformer for each channel, 2 pieces of 400X400X50 heatsinks for each channel, and a bunch of capacitors, so that it will be flexible should I decide to try other “boards”
But with a big PSU, perhaps I should build A1.2 instead of A5, but have total of 16 pairs of output IRF250 MOSFETS for channel, and raise the VCC voltage from 34V to 60V.
With all that power, it would be a shame using it just driving my little SF concertino, so I goggled what are the difficult speakers to drive available, the APOGEE SCINTILLA popped up! A search on the local ads and voila! One pair is available 4 hours away from me.
It must have sounded ridiculous to you that I am putting the cart before the horse, building an amp and try to look for a speaker to go with it🤣
Back to my question, with due consideration for the efficiency of single ended class A, with 2500VA transformer for each channel, what is the highest power output can I get with it, 500W@1 Ohm? 800W@1 Ohm? I need it to be able to drive the Scintilla.
Looking forward to hearing suggestions from you.
Have a good weekend!
