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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: Roving Sign on October 04, 2006, 07:37:16 PM

Title: Old School : QED preamp
Post by: Roving Sign on October 04, 2006, 07:37:16 PM

Just got this thing cheap...15 bucks...

Smaller than the NAK MX100 - and much lighter...runs on 12V DC

I seldom stealth - or even need a DC powered rig - but I thought this looks like fun...

Will report back later...

(http://i10.ebayimg.com/01/i/08/70/72/b5_12.JPG)

(http://i3.ebayimg.com/06/i/08/74/61/61_12.JPG)

Title: Re: Old School : QED preamp
Post by: Roving Sign on February 11, 2007, 11:16:03 PM

I just took some pics of the innards of this thing...seems like some folks like that! ;D

The pics in the original post were linked from ebay...replaced...

Havent used this thing yet - more of a toy - but fun for cheap...

Whats it look like in there??

Title: Re: Old School : QED preamp
Post by: Church-Audio on February 12, 2007, 01:15:53 AM

Quote from: Roving Sign on February 11, 2007, 11:16:03 PM

I just took some pics of the innards of this thing...seems like some folks like that! ;D

The pics in the original post were linked from ebay...replaced...

Havent used this thing yet - more of a toy - but fun for cheap...

Whats it look like in there??

That looks like a good preamp to hack.. Get that ne5532 out and replace it with a OPA2227PA chip.. or TLO82 that's a good place to start I would ditch the electrolytic's in the signal path the two coupling caps near the IC that are electrolytic can go bye bye.. I would put in Tantalum or Mylar 10uf in there place.

Title: Re: Old School : QED preamp
Post by: Roving Sign on February 12, 2007, 01:18:02 AM

Thanks for the info - maybe this is where I begin my hacking career!

QED is British stuff I think...