anyone have a BLA Auteur 500 preamp?

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digitaldrummer
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anyone have a BLA Auteur 500 preamp?

Post by digitaldrummer » Tue Sep 10, 2013 11:03 am

anyone else have a Black Lion Audio Auteur 500 series? I picked one up used recently and when testing it noticed that the gain pot either has a weird taper or this one is defective. so I'm trying to figure out which it is...

I tried a 58 and also an AT37 (to make sure phantom worked). with both I notice that the gain is very gradual (doing almost nothing) until it gets to about 2 o'clock and then the volume jumps pretty quickly and then the preamp gets kind of noisy too (hissy). anyone else experience this?

Mike

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Post by eh91311 » Tue Sep 10, 2013 2:39 pm

I have one of the first 2-channel Auteurs. Mine is OK until you crank the gain up and then you get hiss, which makes it difficult to use with dynamic mics or ribbons. Your mic pot taper issue with the 500-series might require a pot replacement to repair.

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Post by eh91311 » Tue Sep 10, 2013 2:51 pm

double post
Last edited by eh91311 on Tue Sep 10, 2013 5:48 pm, edited 1 time in total.

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Post by digitaldrummer » Tue Sep 10, 2013 4:21 pm

I suspect the pot is either defective or perhaps was already replaced (with the wrong type) - so I may return it. or I suppose I could just repair it.

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Post by Jim Williams » Wed Sep 11, 2013 8:11 am

Sounds like they used a linear taper gain pot. You can check the taper by setting it 1/2 way up and measuring the resistance from the center pin to the end pins. If they are even it's a linear taper.

You want to use a reverse log taper pot for a gain set control. That offers the smoothest gain adjustment. You can get PEC reverse log pots from
www.digikey.com
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Post by digitaldrummer » Wed Sep 11, 2013 8:16 am

Jim Williams wrote:Sounds like they used a linear taper gain pot.
thanks - I agree. it could be they just got the wrong pot stuffed on the board. I think a bad pot would have a dead spot or some scratchiness prior to the "jump" in volume and I'm not getting that. I'm trying to get BLA to tell me the specs on it (no markings on the pot that I can find), otherwise I'll pull it off and measure it. I'm guessing 10K reverse log. I think I even have an extra one laying around. :-)

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