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Old 12th May 2004, 08:58 PM   #1
Wagener is offline Wagener  South Africa
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Default why a cermet pot?

I can't seem to find a 2k cermet pot used in the leach amp. I suppose this is only for quality. Will a normal cheap pot do the job as well?

Also I can't find stacked metal film capacitors. I will be using polyester capacitors instead. Comments will be appreaciated
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Old 12th May 2004, 09:25 PM   #2
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A condutive plastic pot would be much better that a cermet one.
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Old 12th May 2004, 09:40 PM   #3
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Default Sez you...........

"A condutive plastic pot would be much better that a cermet one." - JW

Unless you care what it sounds like........ the cermets sound noticably better. I replaced my ALPS 100K Black Beauty with linear cermets with Caddock resistors from wiper to ground for a law faking taper. There's no comparison. The Alps sounds colored, soft, rolled off, and doesn't have the detail ....... and they cost a bunch. It is complementary to slightly hard and bright electronics. The TKDs are the best conductive plastic ones I have heard but have a different "log" taper and aren't cheap either.
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Old 12th May 2004, 10:02 PM   #4
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Fred,

If cermet pot might be ok as a trimpot in a bias circuit. You should run a HF square wave through one and tell what you don't see.

How the head.
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Old 12th May 2004, 10:19 PM   #5
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you are all wrong the best sound ever from a pot i have from this one:
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Old 12th May 2004, 10:25 PM   #6
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Till,

You win, that is the strangest looking pot I have ever seen and it's power with a car battery. Does it run in class A.
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Old 12th May 2004, 10:46 PM   #7
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Default Re: Stacked caps

Quote:
Originally posted by Wagener

....
Also I can't find stacked metal film capacitors. I will be using polyester capacitors instead. Comments will be appreaciated
Both Panasoninc (type V) and Epcos make stacked polyester caps, B3252X.
Epcos also makes stacked polypropolene caps. B32620/1

All the above radial caps are available from Digikey.com in the States. Outside of N.A. I'm unsure, but assume the Epcos are readily available in Europe.
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Old 12th May 2004, 10:50 PM   #8
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The pot described in this thread is not the type intended for
smoking
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Old 13th May 2004, 12:07 AM   #9
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Hi,

Quote:
I'm unsure, but assume the Epcos are readily available in Europe.
Sure...Epcos is a Siemens spin off after all.

EPCOS DEUTSCHLAND

MKP/MFP CAPS

Cheers,
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Old 13th May 2004, 02:43 AM   #10
sam9 is offline sam9  United States
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If the pot is being used to adjust the bias, Im not sure the signal passed through it anyway. I this is the case, the "sound" is notparticularly inportant but the stability (wrto age, temperature, etc). Also if it's small trim pot, some have a limited number of end-to-end rotations (or so the datasheets say) so there is only so much fiddling with the bias you can do before possible mechanical failure. I don't know if cermet, plasic or whatever suits this use best but perhaps another poster has some info on that.
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