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Old 4th December 2013, 02:25 PM   #1
dodog is offline dodog  United States
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Default Recommend a Preamp!

I'm currently using a simple preamp with a Lightspeed attenuator. Works great. However, I'm a sucker for a project.

I have a pair of ACA amps and an Aleph J in the wings. Can anyone recommend a new preamp to go with these? I see the Mezmerize B1 boards and Burning Amp boards in the store, but I'm open to other suggestions as well. I do plan on using my current preamp with my builds when they're done, but I'm always open to trying new things. Suggestions?
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Old 4th December 2013, 02:29 PM   #2
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I've been very impressed with both the B1 and the Impasse. Both are easy to build.

The B1 of course isn't strictly an amplifier, it is just an impedance buffer.

The Impasse is an amplifier but doesn't have the whistles and knobs of a conventional pre-amp.

Combine the two and you can dispense with the input transformers of the Impasse.
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Old 4th December 2013, 03:55 PM   #3
6L6 is offline 6L6  United States
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O2 headphone amp.

No, I'm not joking.
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Old 4th December 2013, 04:50 PM   #4
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ob disc: I helped design this. look for the AMB lcduino and delta1 (atten) and delta2 (i/o selector). its a relay atten that is arduino controlled (ir, motor pot, etc).

fully open source. boards and kits are available.
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Old 4th December 2013, 04:59 PM   #5
6L6 is offline 6L6  United States
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I've seen that at Burning Amp - very nice!
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Old 4th December 2013, 05:18 PM   #6
dodog is offline dodog  United States
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Quote:
Originally Posted by 6L6 View Post
O2 headphone amp.

No, I'm not joking.
So... why did you build a BA-3 as preamp then?
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Old 4th December 2013, 05:22 PM   #7
6L6 is offline 6L6  United States
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I can only have one?

The BA-3 will swing enough output voltage to clip an F4. Which is an awful lot more than most people need.

The O2 will swing 7V, more than enough for any power amplifier with gain.
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Old 4th December 2013, 06:30 PM   #8
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Quote:
Originally Posted by 6L6 View Post
I can only have one?

The BA-3 will swing enough output voltage to clip an F4. Which is an awful lot more than most people need.

The O2 will swing 7V, more than enough for any power amplifier with gain.
the nice thing about the r2r relay atten is that it does not have a max input voltage. to test my own delta1 system, I built a testing jig to apply voltage to the atten's input, measure its output with a digital fluke meter and then keep stepping the atten down until I get to 127.5db. I used 50v dc as a constant input 'signal' just so that 127db down from there was not totally lost in the noise (for my DMM). show me another input volume control that can take 50volts and still not 'clip' (lol!).
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Old 4th December 2013, 07:15 PM   #9
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Parks audio is soon to release a budgie preamb with arduino and tubes

No pics on the site yet, but there is on his facebook page. It looks really cool.
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Old 4th December 2013, 07:28 PM   #10
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If you decide on the B1, I have a partially populated board for sale.
Doesn't have jfets, but you can still get them and are available from Linear Systems and the store here.

I also recommend the BOZ-J. Hard to beat on quality vs parts count vs cost. Needs two 2sk170 jfets. One per channel.
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