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Old 5th April 2014, 01:04 PM   #1
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Default Best Options for making F-5 an Integrated Amp

I am looking to build an F-5 to go with Markaudio 10P Pensil speakers, and I would like to make the F-5 into an integrated amplifier. My source is Mac Mini/Macbook Air through a Micromega MyDAC.

I have seen the build that includes the Mesmerize buffer preamp in the same chassis as an F-5, and I was wondering what other options/alternatives folks have successfully built or designed to make an Integrated Amp using the F-5 curicuit boards as the amplifier stage. I would be interested in both active or passive/bufffer options.

Thanks in advance for your time and consideration.
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Old 5th April 2014, 02:37 PM   #2
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i had tryed

a b1, bosoz and a aleph P 1.7. (all clones) with my F5 (a clone too).

-i think the b1 could be the best choice -easy to build only unbalanced like the f5
-second best because also easy to build bosoz

possibilitys i had not tryed
The jfet boz, lsk pre from BA2013 and the BA3 as pre could also be good.
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Old 5th April 2014, 06:58 PM   #3
WalterW is offline WalterW  Netherlands
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It depends on if you need additional gain or not... what are the output levels of your DAC?
The Mesmerize and B1 are buffers with no gain, so that won't do the trick in your F5.
BA-3 as a pre has 20 - 30 dB gain, a bit too much.... though it's easy to lower it.
I have build it recently and it sounds terribly good!
Maybe you should try this: Mezmerize DCB1 Building Thread
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Old 5th April 2014, 08:33 PM   #4
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and you could also think about build an aleph j with an aleph p as pre.
If i had to choose an integrated amp at the moment i would do this way
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Old 5th April 2014, 11:54 PM   #5
evanc is offline evanc  United States
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Preamp ideas for F5
post #53... Could not be simpler.
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Old 6th April 2014, 02:36 PM   #6
juma is offline juma  Germany
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If I had to do the integrated F5 now, the preamp part would look like this (see attachment).
It gives a wide and linear response with about 9 dB of gain and Zout=1k (which is fine for F5's Zin of 100k).
It's simple to build, doesn't require hard-to-find/expensive parts and it sounds beautiful.
Id through BF862 is 10mA. Max. clean Vout is about 8V_peak. ELKOs should be high quality type, low ESR.
For use outside the amp's box a buffer stage should be added (so we could drive cable capacitance).
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File Type: gif Pre_4_F5_integrated.gif (5.6 KB, 482 views)
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Old 6th April 2014, 04:02 PM   #7
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Couldn't you go with the B1/F5 combo and reduce the feedback in the F5 to bring the gain up?
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Old 6th April 2014, 08:39 PM   #8
PKI is offline PKI  United States
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Juma, do you think it will work with ACA with its 10k input impedance?
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Old 6th April 2014, 08:57 PM   #9
juma is offline juma  Germany
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Sure, but it wouldn't be very practical since ACA is a single rail supplied amp and this gain stage needs two power rails. Also, the third coupling cap would be needed.
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Old 6th April 2014, 09:03 PM   #10
PKI is offline PKI  United States
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Oh, sure, forgot about it. Do you maybe have smth for a single rail? From the top of your head.
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