Ordering Omeg Pots for Calrec EQ (and other project)

Hey Guys,

I ordered my pots for the Calrec EQ from Omeg, the ECO range.

It had been stated in a previous thread that you needed PC16ECO 10KB
with centre indent, this however I have found is a 10K LOG pot, but the
BOM/Parts list calls for a 10K LIN Pot.

The ECO 10K LIN Pot part no is actually PC16ECO 10KA.

I?m glad I found out as they were literally at the point of manufacturing,
but Margaret noticed that my description 10K LIN didn?t line up with the
part number, which was LOG.

Cheers

Matt

I thought it was a LIN pot
It's for the "volume control" - I guess you want the volume control to go down and up in equal steps and not logarithmic steps
e.g. 50% of the way around you want 0db to be half way between say -10 and +10 (otherwise why bother buying a centre detent pot)
If it was a log pot it would probably be around the -4 ..

Christ - if I got that right - I think I might be on the beginning to start to understand this audio lark...

Hey Simon

I didn't install yet the Omeg pots into the Calrec boards so by curiosity, five minutes ago I measured the 10K pots at mid position.
One half a bit over 1Kohm and the other half a bit over 8Kohm. S H ! T ! We have log pots for level, and that is bad.

chrissugar

I wonder if this is why some guys are having gain issues with their Calrec?s?

I asked Margaret at OMEG the following question:

For my own peace of mind and others on the audio forum I am part of  please
confirm your lettering system works as follows:

A= LIN
B= LOG
C = REV. LOG

I want to post this info so other don't make the same mistake I 'almost' made.

Click to expand...

Her response was as follows:

Yes Matt that is correct.
(I think the Far East do it slightly different).

All the best
Margaret

Click to expand...

Hope that helps you guys!

Cheers

Matt

I have 6.5 dB of gain across the whole spectrum. I used the linear pots. The log pots should present discrete areas of gain reduction at the four frequency centers. I think most folks with the gain increase are seeing full spectrum gains.

-Chris

Fabio/Chris
PM me - I will try and figure out what to do next

I think with the right resistor, you can re-linearize your pots:

http://www.geofex.com/Article_Folders/potsecrets/potscret.htm

-Chris

Nope. No cheating possible here, I think. Need constant-impedance.

You'll need 10KA - that is Lin - for the Calreq.

Japan - and often US names lin. pots as e.g B10K for a 10K lin, whereas Europeans use the other order: 10KA

A centre-detent log. pot wouldn't really make sense, would it?

Jakob E.

Drat! That impedance issue always messes me up.

HI ALL

SORRY ALL FOR THE BONEHEAD MISTAKE!!

I got my ALPS laws and my OMEG laws backasswards.

Alps A=log B=lin C= antilog.

Omeg A=lin B=log C=antilog.

MATTA IS RIGHT....OMEG part# PC16ECO 10KA
with centre detantes is correct for the lift/cuts. This
pot MUST be a LIN pot.

All of my posts have been updated and corrected.

Thanks Matta for the discovery and I hope none of
my friends here got hosed.

GARY

[quote author="gar381"]
Thanks Matta for the discovery and I hope none of
my friends here got hosed.
GARY[/quote]
Only a group buy of 50 pieces!
My pocket will be stinging... my children will go hungry....
I am helping the guys out on this one...
No probs - my fault for not double checking

Anybody got any idea what I can do with 10k centre detent LOG pots??

Gain trims with "zero db" click at centre?

For what its worth: This is what I ordered from Omeg

PC2G16BU 100KC x 100KC 7.5MM pitch
PC16BU 10KA Spindle M22 L = 15MM