UA Apollo preamp knob

[MiamiBoy]

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

 

[Ike Zimbel]

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?

 

[MiamiBoy]

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

 

[Khron]

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.

 

[MiamiBoy]

Thank you. I found some parts on Mouser, but not an identical one.
I just started a ticket with UA, let's see how they reply.

 

[zamproject]

If led array match impulse/turn this is a 18 step ?
No ref on the back if you desolder it ?

 

[Khron]

but not an identical one.

And you figured that out how, exactly?

If led array match impulse/turn this is a 18 step ?

Why would that be the case?

 

[MiamiBoy]

Aren't they called 360 degree "endless rotation" ?
Someone replaced theirs on an Apollo Twin https://fb.watch/waX7BHkfSY/

 

[13engrsapper]

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.

 

[Khron]

so a rotary encoder capable of something like 56 different output options.

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?

 

[zamproject]

Why would that be the case?

Because led array seem 20° and I personally find convenient when a led pointer around an encoder follow the fingers move...
But this speculative, I don't know the UA.

 

[Khron]

Because led array seem 20°

... But do they cover the full 360deg circle?

 

[Rusan]

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.

 

[zamproject]

... But do they cover the full 360deg circle?

Obviously not by pictures, I don't get your relation to full circle.

The OP may count the detents for one turn if it's a detent one, which may or may not correlate with pulses per turn...

 

[Script]

As for number of detents of the broken one, could desolder and open it.

 

[NoisyIndividual]

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.

 

[13engrsapper]

64 pulses per revolution. https://www.digikey.com/en/products/detail/bourns-inc/EM14R0B-M25-L064S/4698978

 

[NoisyIndividual]

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.