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Slenderchap

Christmas offering.... Fairchild Valve EQ ..... ez627
« on: December 23, 2016, 09:03:43 AM »
After 6 years of waiting I finally got round to finishing this project off:




It's a mono EQ made by Fairchild in the 1950's for mastering:
http://www.worthpoint.com/worthopedia/vintage-unobtanium-fairchild-627-tube-135319292

Colin
www.audiomaintenance.com


ruffrecords

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #1 on: December 23, 2016, 09:14:14 AM »
A thing of beauty Colin. I love the triple gang pots for the frequency selection and the good sized screened box for the PSU.

Happy Christmas

Ian

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #2 on: December 25, 2016, 04:17:47 PM »
great work Colin!

ubxf


ruffrecords

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #4 on: December 26, 2016, 04:05:20 AM »
http://www.preservationsound.com/?p=8602

THat is an incredible circuit for the era. I still have not got my head around it. The only 'obvious' part is the low roll at the input. Looks like the CF after the first stages feeds a twin T followed by and active twin T which then feeds back to the input. even the high roll is very different.

Thanks for posting.

Cheers

Ian

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #5 on: January 01, 2017, 12:02:45 PM »
12 u for stereo 2band eq?  ;D

Are the "roll" functions high/lowpassfilters?

Majestic12

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #6 on: January 01, 2017, 12:12:14 PM »
Did the magic eye tube in this EQ have any practical functions back in the day, or was it only decorative like in the Shadow Hills mastering compressor ?
« Last Edit: January 02, 2017, 03:48:24 AM by Majestic12 »

thomasdf

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #7 on: January 03, 2017, 06:37:38 AM »
Holy f***!!!!!!!! Amazing build!!!
How does it sound?

moltenwok

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #8 on: January 03, 2017, 01:34:49 PM »
Are you planning a group  diy offering ...... Please nicely

MrBlomski

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #9 on: January 04, 2017, 07:25:59 AM »
Hear Hear!!!!!!

Nice one. I've seen it on you're website when I was browsing and thought to myself "Hey, that is a new shiny object!"

:)

Best wishes for 2017!



tommypiper

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #10 on: January 07, 2017, 02:44:47 PM »
Very interesting. 

Colin, BTW your build document link on your site links to another project.
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..

Re: Christmas offering.... Fairchild Valve EQ ..... ez627
« Reply #11 on: January 10, 2017, 11:08:38 AM »
Colin,

Do you have any demonstration videos in the works? I'm very interested, but would like to hear it in action.

Dan