G-Calrec 100k rev log Monacor pot question

[syn]

Hi
Recently i bought 100k log pots from Monacor, thought i'll reverse them, and get 100k rev log pots for G-Calrec. When the pots arrived i've noticed that they are marked 5L4 A100K, which led me to believe that they are lin not log pots. Being a newbie, i did not complain, thought it might be one of those "no standard" situation...
Now that i finished one ch. of Calrec pots don't behave as expected. If i reverse them, they reverse the action as well going from HI to LO CW, if i use them as stock they make no change to a sound turned half way CW and the go from LO to HI. The pots are to be used as freq. dials. The question is: are they LIN pots :shock: :?: Otherwise EQ works, and i love the sound...

Thank you

 

[PRR]

> might be one of those "no standard" situation...

There are at least three different "standards" for pot taper letters.

> The question is: are they LIN pots

Set the knob exactly in the middle and measure from wiper to each end. If "same", it is Linear. If about a 4 or 5 to 1 ratio, it is 20% audio; 10:1 ratio, 10% audio taper.

Imagine you mount it in a radio and wire it "normally". The end the wiper touches at full-up clockwise goes to signal source, the end the wiper touches at CCW full-down goes to ground, and take signal from the wiper. Set the knob exactly in the middle. If it gets 10%-20% signal, it is common audio taper, as used in radio Volume controls to handle a 100:1 range of station-strengths and listening levels without having to work down in the crack above "0". If it would give 90% signal connected this way, it is Reverse Audio, suitable for active-gain controls and frequency knobs.

You can use a Normal Audio Taper where you really want a Reverse Audio, if you switch the two end leads, flop the knob scale, AND switch the habits in your head. Turn clockwise for 100Hz, counter-clockwise for 10KHz. Turn clockwise to "turn down the gain". Try it. It feels wrong.

It should not be that difficult. The "volume control" on a kitchen stove works opposite to a radio volume control. Turn counter-clockwise to get bigger gas/electric fire and bigger boil. Yet most people get very befuddled when a "radio" (any electronic toy) works this way.

 

[Larrchild]

The Gas Cooker Preamp uses stove knobs which appear to be backwards like PRR sez. They must have gotten the same wrong pot shipment.=)

 

[gyraf]

We've discussed markings on pots several times before.

European standard like 10KA - with the letter after value: A=Lin, B=Log
Asian standard like A10K - vith the letter before value: A=Log, B=Lin

If you're still unsure,m PRR's model is always the safe way to check.

Jakob E.

 

[syn]

Done the testing, and yes they are LOG pots. Due to the construction of the pots i can't open them and reverse (have seen "how to" on Gyraf site), so i'll have to live with reverse frq. scale until i get new pots.

Thank you very much. :thumb:

 

[ioaudio]

[quote author="Larrchild"]
The Gas Cooker Preamp uses stove knobs which appear to be backwards like PRR sez. They must have gotten the same wrong pot shipment.=)[/quote]

funny, today i was at the local music store and saw this preamp. the scale doesnt move but the knob inside, so it works clockwise.

 

[Infernal_Death]

Just a quick question. I have a potentiometer marked "C500K" in the schematics. So what characteristics is this ? Rev log ?

Thanks

Flo

 

[Guest]

[quote author="Infernal_Death"]Just a quick question. I have a potentiometer marked "C500K" in the schematics. So what characteristics is this ? Rev log ?

Thanks

Flo[/quote]
100KC - is my Rev log pots from Omeg

 

[syn]

[quote author="Infernal_Death"]Just a quick question. I have a potentiometer marked "C500K" in the schematics. So what characteristics is this ? Rev log ?
[/quote]




Asian standard like A10K - with the letter before value: A=Log, B=Lin

as Jakob pointed out. What is that pot used for? If it is for freq. than it
is probably rev log pot.

cheerz

 

[Infernal_Death]

Thanks.
The pot is used for a "drive control" in a bass preamp.

Flo

 

[syn]

ufff wouldn't know anything about "drive" controls, probably introduces some sort of distortion.post the shemo so someone will check it up for you.sorry.