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Old 30th November 2004, 03:32 AM   #1
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Lightbulb Group Buy idea: PEC carbon pot (The P. D. recommended one)

Hello,
I thought I would post this here since a lot of you use pots with you chip amps. I am trying to organize a group buy for the new PEC pots that Peter Dainel so highly recommended ( found *HERE* ).

There is one place I found that sells them for $50 + $7 for shipping ( found *HERE* ).

So far I'm looking at a stereo pot, 10% precision, 10K ohms, log taper, SS shaft & case, with gold plated terminals. We need to get 30 for the price to be ~ $37. Shipping ~ $5 which = about a $15 savings. If we could get 50 or 100, the price will be even lower!

Let me know what you guys think as well as any suggestions. I may also be able to break up the order such as 15 x 10K pots, 10 x 20K pots, & 5 x 50K pots... you get the idea

Thanks,
-CHRiS

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Old 1st December 2004, 07:34 AM   #2
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Default Cheaper in this place (if you buy ten)

Hi,

I found it is cheaper to get the PEC on this site:

http://www.e-sonic.com/acc/products....ion+Electronic

Regards,
---
David
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Old 1st December 2004, 01:29 PM   #3
KT is offline KT  United States
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I'd be interested a group buy, but can we get a discount price directly from PEC?

I'm not sure about the spec of the stock pots, but looks like Brian Cherry may have specced tighter tracking tolerance on the ones he's selling.

Anyone have tracking problems with these?

Also, I'd be more interested in the 1M value for use with a faking resistor, myself.

KT
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Old 1st December 2004, 01:55 PM   #4
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Quote:
Originally posted by dw1narso
I found it is cheaper to get the PEC on this site:
I called Electrosonic and KK pots are available from them:
http://www.e-sonic.com/acc/products....command=detail

http://www.e-sonic.com/acc/products....fPotentiometer

10pcs price is $27.60 and when you go over 40 pcs. the price goes down to $22 . The lead time is 1 month. All prices in CAD.

When I called PEC, they quoted me $80 for a single pot and something like $40 for 10 pcs.

BTW, both PEC and Electrosonic are located in Toronto
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Old 2nd December 2004, 01:54 AM   #5
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Hi Chris,

"Let me know what you guys think as well as any suggestions. I may also be able to break up the order such as 15 x 10K pots, 10 x 20K pots, & 5 x 50K pots... you get the idea"

what about other value?

Hi Peter Daniel,

beside the 50K Log that you try, have you try other value (10K, 25K, 100K, 250K) and type (linear/log) and faked linear pot?

What do you think about 500K linear pot + 22K law-faking resistor (as available on the Brian kit) will be good?

I see that Mr. KYW suggesting law-faked linear pot will be better than log one, and he suggest highis valued pot...

Actually I'm worry whether my CD player (Meracus Tanto, which only has 1.2Volt output, not a common 2.0Volt) will be able to drive such a high value... (500K or 1M)...

Thanks,
---
David
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Old 2nd December 2004, 02:58 AM   #6
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I tried 25K log and it worked fine with GC amp. I have no experience with linear pots and law faking resistors. I'm also scared by high series resistance in such applications.
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Old 2nd December 2004, 03:12 AM   #7
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Default Why not mono pots

I switched to PEC pots a little while back. I bought 5 25K mono log pots at 9 something each. Was able to match 2 exactly, and two more at 100 hms, which is 0.4 %. The two used seem track perfectly.
I really wanted some 50K stereo log pots to parallel to make a 25K mono pot. The the mono pots seem to work fine. I think to get a good match it will require purchasing a handfull of stereo to get 1% match.
As a side, the taper on these is different than others tried. It is much more gradual on the low end. It is the exact opposite to the normal hair trigger pot. But once past about half way open the volume comes up fast.
I really like mono pots. With my DIY skills the ability to shut off one channel to locate a problem is handy.

George
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Old 2nd December 2004, 04:02 AM   #8
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Default To Peter which of is better

Hi Peter,

which one of the 25K log and 50K log is better? On Brian's GC, as a passive...

also when you try pot (both pot cases), did you remove/unremove the 20K/22K (R2) shunt resistor?

Off topic, I found that on the schematic (as on Brian's nigc_kit-users_guide.pdf) the R2 is placed (shunted to the ground) in front of R1 (grid stopper? as in tube amp design to reduce oscillation?) while on the board, I found that R2 is placed after the R1. Is there any reason for this?

REgards,
---
David
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Old 2nd December 2004, 04:37 AM   #9
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I believe there is a mistake in a schematic, as the shunt resistor is preferred to be after the series resistor.

25k version is better choice for GC. I still use 22k shunt Caddock, as it sounds better to me this way.
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Old 2nd December 2004, 04:48 AM   #10
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Hi Peter,

25k pot & 22k shunt... means totally closer to the 10K pot then?

Regards,
----
David
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