I agree 100%
I wasn't suggesting F5 was the best, I probably prefer Aleph J, but it depends on your speakers. F3 is nice too, especially in a biamp setup.
I have some plans for mods on ACA.
Papa tells me that it's not that simple. My quotes of him are always wrong, but I believe he said a surprising number of people find 3rd harmonic sounds "more detailed" and I do find the F-5 sounds more detailed and analytic. Some really like that.
But in the Pass amps that have other harmonic structures, I always am surprised how the detail seems to be still there- it just doesn't hit you over the head.
A lot of what I've read seems to say that low order harmonics second or third, aren't the problem, it's the higher order ones.
But in the Pass amps that have other harmonic structures, I always am surprised how the detail seems to be still there- it just doesn't hit you over the head.
A lot of what I've read seems to say that low order harmonics second or third, aren't the problem, it's the higher order ones.
Mr. Pico:
Yeah that supply should easily power 2 channels. You'll just have to have it connected to both channels. Please keep me informed if you find the PSU's. It's hard to imagine that trhey weren't included as they are 3/4 of the weight of the parts box so it would have been obvious if they were missing. Continue keeping us informed!
Mark
Yeah that supply should easily power 2 channels. You'll just have to have it connected to both channels. Please keep me informed if you find the PSU's. It's hard to imagine that trhey weren't included as they are 3/4 of the weight of the parts box so it would have been obvious if they were missing. Continue keeping us informed!
Mark
They were definitely included, they are just MIA.
I'll have a look at work.
I'll probably buy another kit to modify and do an A/B comparison, so if they don't show up I can use the power supplies from the 2nd kit
If you have 90dB speakers or better, and are looking for something new to build then build this amp. Very nice in a small room.
I'm talking about the preference of the majority. Lowest distortion and good harmonic structure, that's J2. Good harmonic structure and bad distortion, that's tube amps
I think more than 80% who have built Aleph-J and F5 preferred Aleph-J. Built carefully, even generic Aleph (IRF610/9610) will most probably beat F5 in a blind test.BTW, if you remove second harmonic without changing other harmonics, yes, the sound will be a lot more detailed.
Has anyone done a higher voltage version of this amp?
From memory IRFP240 sounds even better with higher Vds. Will probably need a bigger heatsink etc but I'm curious to see what others might have done with this amp.
Or I'm considering some other output devices.
I think this amp is undervalued and has potential to be even better with some further tweaking.
From memory IRFP240 sounds even better with higher Vds. Will probably need a bigger heatsink etc but I'm curious to see what others might have done with this amp.
Or I'm considering some other output devices.
I think this amp is undervalued and has potential to be even better with some further tweaking.
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The dissipation is pretty high with the stock voltage and current. Increasing the Vds further would make even more heat. Extra heat could be handled by bigger heat sink up to a point or can cooling. Papa commented that paralleling devices In this design is not the way to go. I wonder if the SiC mosfets with lower capacitance than the IRFP240's might be able to work when paralleled in the ACA and with increased voltage?
Tweak On Garth! That's the Amp Camp Way. There is info in this thread about higher voltages, etc. Yeah, it's long. And a small fan is worth about 4x the heatsink size! That's the way to try high power.
I was using them with those trendy bargain basement Pioneer speakers which are quite innefficient. Sounded quite good though. One day I thought "Honestly these sound pretty bad, you've been fooling yourself" Then I realized I had them turned up pretty high and they were clipping like crazy. There's only so much 5ish watts can do! Turned them back down and moved the speaks closer, and ... ahhhhh!
Mark
I was using them with those trendy bargain basement Pioneer speakers which are quite innefficient. Sounded quite good though. One day I thought "Honestly these sound pretty bad, you've been fooling yourself" Then I realized I had them turned up pretty high and they were clipping like crazy. There's only so much 5ish watts can do! Turned them back down and moved the speaks closer, and ... ahhhhh!
Mark
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What about replacing the 3300uF panasonic output cap with 2 x 1500uF Elna Silmics.
Aaaaah Crap. It will have to be 3 x 1000uF, they dont make 1500uF in Silmic II