UA Apollo preamp knob

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MiamiBoy

Well-known member
Joined
Dec 23, 2018
Messages
231
Location
Cph, Denmark
Can anyone recognize what this is?
Im trying to find it on Mouser, but I'm not having any luck in the searches.

It's the Preamp click knob, with infinity turns. Looks identical to the Monitor knob.

Universal Audio Apollo 8p
199 or 661 stamp on it
universal-audio-apollo-8p-review-2.jpg
 

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It looks like what you need is the encoder. The "knob" is the round plastic thing that you use to turn the encoder. Do you still have that part? I'm not that up on the different qualities that distinguish one encoder from another, so maybe someone else will chime in here with that info. Have you asked UA if they will sell you the parts?
 
Thank you for participating, Ike.
I still have the knob, yes. It's fine.
The encoder broke and I wasn't succesful gluing it back on, since it's metal and there's no stump left at the base.

I haven't asked UA, no. I don't even wanna bother.
I figured this was a standard component like a potentiometer that could be found on Mouser. Maybe i'm mistaken.
Hopefully someone can shed some light on this. Thanks
 
The encoder

Even the designator next to it says "ENC1".

Odds are the other one that's still in one piece could be used to count how many steps per revolution you're looking for..? Looks like you want one that also includes a switch. Pretty standard stuff otherwise.
 
I wonder if it is the same as inside the Apollo twin? mine seems to have two steps for every LED - so a rotary encoder capable of something like 56 different output options.

I think MOST rotary encoders are infinite turns, at least the ones I have run into. There were some in a solid state Fender amp from the 90's I just worked on.
 
12 and 24 steps (or rather, detents) per rotation are much more common.

It might take 56(?) steps to go from lighting none to all the LEDs, but how many 360deg rotations does it take?

On the Apollo Twin, one step of the encoder dimly lights the first LED, another step fully illuminates it, the next dimly lights the second LED, and so on. It takes exactly 540° of rotation to fully illuminate all 27 LEDs.
 
On the Apollo Twin, one step of the encoder dimly lights the first LED, another step fully illuminates it, the next dimly lights the second LED, and so on. It takes exactly 540° of rotation to fully illuminate all 27 LEDs.

So that pretty much confirms a 24 detent data pot?

At the end of the day you just want a pot that works.
So you go to Mouser or whatever, find the one that looks like yours, then download the data sheet.

Find the one that's actually available and buy it and cut/grind the shaft to suit the knob.

I suspect that's what most of us do.
 
Well unfortunately you fell at the first hurdle here.

Number 1 is you find the pot with the same footprint.
That isn't it.

What you want is the standard data pot with the 3 legs at one side and the 2 pushswitch legs at the other.

Then you can decide how many detents you are actually able to buy, and the type/length of shaft also available.


Then you buy it and make it fit.
 
I ALWAYS contact the manufacturer first, I've never needed any parts from UA but I did recently need parts for a MOTU rig and I got them directly from MOTU and at a better price than a reseller.
 
I did recently need parts for a MOTU rig and I got them directly from MOTU and at a better price than a reseller.

Really? Who did you have to blo... I mean bribe, to get that? They wouldn't even share the already-compiled* firmware for an 8pre...

* Compiled, as in NOT the source code, as in no IP infringement even possible, so no real reason not to.

(Later edit) And not even a piece of hardware, so no shipping costs either...
 
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