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Old 24th February 2013, 03:33 AM   #11
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alephX or any balanced F4 or what ever, is not recomended for 4ohm speakers. a high bias/low voltage F5turbo is better suited for that job.
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Old 25th February 2013, 06:55 PM   #12
chuckd is offline chuckd  United States
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Quote:
Originally Posted by PKI View Post
And what about your music taste? I am A/Bing F5Tv2 and Aleph 60 now... Tough choice... :-)
I like 90's indie rock, electronica, and blues. I do like to crank The Pixies every now and then for sure.

I read some reviews on the Aleph and F5 and it seemed that the F5 was a bit more detailed which is what I prefer. I like to be able to hear the individual instruments and the voice variation as the singer holds a long note.
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Old 25th February 2013, 06:59 PM   #13
PKI is offline PKI  United States
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Go for F5T, brilliant amp, you will love it!
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Old 25th February 2013, 07:09 PM   #14
chuckd is offline chuckd  United States
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Originally Posted by 6L6 View Post
Who has built one? Using what boards? I'm only curious, I didn't think there were any out in the field yet.
I think oneplustwo built some. And also Eric (also a member on DIYaudio). See Aleph-X 100w Amplifier Construction Notes.

I'm not sure of the boards they used.


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The other 100WPC Pass DIY solution is a pair of F4 and a balanced preamp. Nobody ever remembers that...
I looked at the F4 and F5 on firstwatt.com and saw they both had the same power out. I focussed on F5 since there was a builder's thread and seemed to be more info available for it. I knew of it but wasn't around when it came out so didn't 'remember' it as such. Did it compare well with the F5? What's the advantage/disadvantage of balanced vs unbalanced?

I'm reading "Designing Audio Power Amplifers" by Bob Cordell to understand the terminology better and the importance of various components of an amp so it's probably outlined in there too.
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Old 25th February 2013, 07:13 PM   #15
chuckd is offline chuckd  United States
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Originally Posted by PKI View Post
Go for F5T, brilliant amp, you will love it!
Righto. Will do.

I'm really looking forward to getting into it probably later in the year.

Any particular version you recommend? I was just going to do the v3 since it has more power and was the latest design for the F5.
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Old 25th February 2013, 07:17 PM   #16
PKI is offline PKI  United States
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It is the same time design as any of F5T :-). It depends on how loud do you like your music. I have 89-90db 6 Ohm speakers and F5Tv2 is more than enough for me :-). I think it is better to go lower in rail voltage, but higher in bias and maybe more outputs. You can still have 4 pairs/ch and 32V rails.
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Old 25th February 2013, 08:22 PM   #17
chuckd is offline chuckd  United States
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Originally Posted by PKI View Post
It is the same time design as any of F5T :-). It depends on how loud do you like your music. I have 89-90db 6 Ohm speakers and F5Tv2 is more than enough for me :-). I think it is better to go lower in rail voltage, but higher in bias and maybe more outputs. You can still have 4 pairs/ch and 32V rails.
Ok thanks for the advice. I'll keep it in mind as I begin to collect the parts I need.
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Old 27th February 2013, 08:48 PM   #18
Eric is offline Eric  United States
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Originally Posted by AudioSan View Post
alephX or any balanced F4 or what ever, is not recomended for 4ohm speakers.
Hmmm... I must have missed this somewhere along the way - no one ever told me that I can't drive my 4-ohm speakers with my Aleph-X amps These amps handle my giant open baffle speakers with ease!

Everything you need (except boards) to build an Aleph-X can be found on my web page - see sig link. F5 boards are probably more plentiful right now, though.

Sorry, I don't have any info on sonic comparisons between the F5 and Aleph-X...

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Last edited by Eric; 27th February 2013 at 08:51 PM.
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Old 28th February 2013, 04:59 PM   #19
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Originally Posted by chuckd View Post
I looked at the F4 and F5 on firstwatt.com and saw they both had the same power out.
Running single-ended stereo, yes.

Quote:
I focused on F5 since there was a builder's thread and seemed to be more info available for it.
I wrote that. I'm working on one for the F4 as we speak.

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Did it compare well with the F5? What's the advantage/disadvantage of balanced vs unbalanced?
Well, if you have a balanced preamp with about a 20v output swing, you can drive a pair (as monoblocks) of F4 to 100WPC. The disadvantage is that you are basically building a preamp specific to the needs of those power amps. The advantage is that you then have F4's, which practically everybody says are completely transparent sonically.

Anyway, F4's aside, have you started collecting parts for your F5T build?

Last edited by 6L6; 28th February 2013 at 05:10 PM.
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Old 28th February 2013, 05:25 PM   #20
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If considering the F4, an excellent driver for it is a buffered opa1632. Will swing it rail to rail, no worries and is SUSy based.
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