Dmichel123

B&K 2603 for Altec M-11?
« on: October 29, 2018, 03:32:13 PM »
I'm trying to wrap my head around what's needed to convert this measurement mic pre/psu to work with an Altec M-11 mic. Anybody ever done anything with one of these?


gyraf

Re: B&K 2603 for Altec M-11?
« Reply #1 on: October 31, 2018, 03:38:23 AM »
Work involves step-up transformer to the input, and output transformer after cathode-follower at the out

I never got it to work well..

Circuit is optimized for frequency response NOT for noise (as we don't care beyond the -20dB tha tcan be shown on meter scale)

Jakob E.
..note to self: don't let Harman run your company..

mjrippe

Re: B&K 2603 for Altec M-11?
« Reply #2 on: October 31, 2018, 11:47:58 AM »
Work involves step-up transformer to the input, and output transformer after cathode-follower at the out

I think for the M-11 you can skip the input transformer.  The mic sends signal straight off the cathode of the 6AU6 and there is an output transformer in the PSU.
« Last Edit: October 31, 2018, 12:05:52 PM by mjrippe »

Dmichel123

Re: B&K 2603 for Altec M-11?
« Reply #3 on: November 05, 2018, 01:20:23 PM »
Work involves step-up transformer to the input, and output transformer after cathode-follower at the out

I never got it to work well..

Circuit is optimized for frequency response NOT for noise (as we don't care beyond the -20dB tha tcan be shown on meter scale)

Jakob E.

What do you think is the reason for noise as built? Layout? I was hoping to use this thing as the mic psu and preamp in one box. I will attempt to draw a schematic of what I've attempted so far, I had no signal from mic at that point.

gyraf

Re: B&K 2603 for Altec M-11?
« Reply #4 on: November 14, 2018, 05:02:00 AM »
What do you think is the reason for noise as built?

The circuit is optimized for linearity, not noise - because whatever err-readings you have below -20 on the meter scale is wholly insignificant in real use.

Let me know what you come up with - I still have the unfinished project stashed somewhere..
..note to self: don't let Harman run your company..


 

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