Pot Substitution

[kd]

I've placed two orders now and both times forgotten to put a 250k audio pot on the order for my mid control. I'm building the ODS 101 non hrm and this is the only thing keeping me from completing the build. I have a few other pots in stock. Will one of these be a suitable substitute: 250k linear, 100k audio or 100k linear.

Thanks,
Ken

[ChrisM]

A 250K linear will work for the time being. In the end you do want an audio (log) pot though in the end.

[dimitris]

I would use the 100k linear.A 250k log pot used as a variable resistor in the middle of it's rotation range would give you about 37k to ground.A 100k linear in the same position would give 50k to ground.I think it's good enough even to use it permanently.

[Structo]

The stock D'Lite amps have a 100K linear in that spot.
Might not be ideal but it worked fine.

[hairyandy]

you do want an audio (log) pot though in the end.

...he said, half in Ernest!

Andy

[marcos]

I have tried all the variations and would definetely go for a log pot.
The linear pots do much past twelve o´clock.I think HAD used them mostly because they were readily available (Fender reverb pot).
Funny, I have seen five Dumbles (including my personal amp),
and all of them had a log pot for the mids, either 100K or 250K.
When I first saw a linear pot in a schematic I thought it was a mistake.

[kd]

Thanks guys, I'll pick one a see how it goes.

Ken

[JD0x0]

Thanks guys, I'll pick one a see how it goes.

Ken

the 100K log will work pretty good for a mid pot, i like to save the 250K linear for treble pots. JMO

i really like the 250K log for mid pots so i'd swap it out ASAP after you fire up your amp for the first time.

[Structo]

I don't mean to derail this thread but since we are talking about tone pots I was wondering something about the bass pot.

What does the .001uF cap across the bass pot do?

I assume it is there to bleed off some highs but is there a scientific reason beyond that?

[JD0x0]

I don't mean to derail this thread but since we are talking about tone pots I was wondering something about the bass pot.

What does the .001uF cap across the bass pot do?

I assume it is there to bleed off some highs but is there a scientific reason beyond that?

I've wondered this too, my layout says to use a .01uF cap while most dumbles say to use a .001uf

I just threw a .0022uF cap on there for now but im not sure what it does

[JimiB]

you do want an audio (log) pot though in the end.


...he said, half in Ernest!

Andy

ROFLMAO!
Sicko

[Jana]

Dang, I saw the post title and thought it was about something else.

[Chad]

Dang, I saw the post title and thought it was about something else.

[llemtt]

What does the .001uF cap across the bass pot do?

it improves the functionality of the mid control when using the .01 mid cap and reduces also very high freqs a little

it let's you scoop mids by 1-2 dB more than without it, to me it's definitely a must in a skyliner stack

you can try values up to 2-3n here, no more or you start to loose to much highs (think Jazz setting)

cheers
teo

[Structo]

So if you use a .05uF mid cap, should this .001uF cap on the bass pot be eliminated?