Equalizer in a Hi Fi system

Hi Guys,

Just stumbled across this thread. 

I designed the PEQ-1 for Mike D way back when.  It is pretty much a "fit/form/function" copy of the Pallette preamplifier.  Per Mike's request, added the switchable frequency center points PLUS the top end 50K freq he wanted.  

Made up one for myself, sans transformers, in a small box like the Loki.  Have that on the end of a 25ft umbilical so I can use/adjust it from the listening position - with an in/out switch and gain trim for both channels.  Still use and enjoy it after all these years.  Yep - PROGRAM equalization, when necessary, works for me.  Glad you enjoy it also!

Thanks for sharing!  Very cool. I own 3 CO PEQ-1 now. Nothing else sounds quite like it!

If you're able, suggest bypassing either the input or output transformers - or both. Never liked their "sound"

Personally a fan of trasnformer coupled inputs, especially their rejection of ground loops.  If you bypass either, do the outputs.

@stellavox1  - Any idea who made them?

@erik_squires +1

transformer coupled inputs make perfect sense from circuit design side, specifically if long balanced 600 Ohms cables used between impedance matched units. Jeff Rowland uses those for almost all his designs! The “only” problem is a very high cost of good ones :-).