Comments on: Altec 1588C Stand-alone Mic Preamp

By: Darren Shorsky

Darren Shorsky — Sun, 12 Feb 2023 14:06:54 +0000

All i can say is i’m blown away by your builds & your entire website actually…… well done!!!

By: chris

chris — Mon, 12 Apr 2021 11:19:33 +0000

In reply to Maxx Zinno. Hi, no, i can't do that, no time

By: Maxx Zinno

Maxx Zinno — Wed, 07 Apr 2021 18:25:39 +0000

Hi,

I have one of these 1588C.

I would like to build it.

Would it be possible to purchase step by step instructions on how to build it? with A BOM if possible? Thx.

By: Joe

Joe — Fri, 17 Jul 2020 04:26:48 +0000

Ditch that power supply and use a old xbox 360 power brick… it has clean 12v 10a dc and 1a 5v supply for your bulb …no need to worry about voltage drops

By: Stuart CODY

Stuart CODY — Mon, 23 Mar 2020 19:40:35 +0000

VERY nicely executed project!! You should release the schematic.
I’m thinking that the VU meter won’t have the specs of a true VU meter; there are ballistics considerations, and generally a 3600 ohm resistor in series with the drive ckts.
It’s a shame that the pdf spec sheet for the 1588C has such low resolution that the pinout cant be determined. I’ve looked around for a better scan of the Altec lit. so far, no joy.
Though the 1588B pdf has readability.
I don’t think the freq. response you report is SO bad…. -6dB from 20 to 20K.
Note that the advice from Altec has you simply shorting pin 2 to pin 6 for the full gain, and you will find that you can choose from a range up to 20K when inserting a resistor. A graph is included on the sheet for choosing values. Check out Altec’s manual for the 1589A mixer…

By: Ross

Ross — Mon, 11 Nov 2019 11:51:43 +0000

The only things I can think of is that someone tried to measure this thing and put too much level into it and overloaded the core in such a manner that it collapsed, severely affecting the frequency response.
Or someone knocked it about, thereby disturbing the core in a fysical way with the same result. Mic transformers usually have mumetal or permalloy cores which are rather sensitive to rough handling or dropping.