ruffrecords

Fitting fader knobs
« on: March 22, 2021, 07:20:10 AM »
For most mixers I build I use ALPS K faders with T-bar fixings for the knobs. For the poor man's tube mixer I have been looking for cheaper alternatives and have settled on the Bourns PTF series because they are lower cost, have a good feel and a guaranteed 1 ohm or less off resistance. So I bought a few and some knobs to go with them. They do not have a T-bar with pips like the ALPS but instead they have a plain upright lever that the knob fits onto (I think this is called Type A).

The problem is, the fit of the knobs to the lever seems to be very variable. Most knobs slip on all to easily and to my view are rather sloppy (but they feel OK). Also, out of a batch of ten, three will not fit at all. I am reluctant to push them on with much force for fear of damaging the fader.

Is this normal with this type of lever knob combination or do I just need to buy better made knobs?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


abbey road d enfer

Re: Fitting fader knobs
« Reply #1 on: March 22, 2021, 07:29:24 AM »
The problem is, the fit of the knobs to the lever seems to be very variable. Most knobs slip on all to easily and to my view are rather sloppy (but they feel OK).
In that case, the fix is easy. Put a drop of liquid neoprene glue, press the knob on the fader, then disassemble them, let dry a couple of minutes and you can reinsert it.

Quote
Also, out of a batch of ten, three will not fit at all. I am reluctant to push them on with much force for fear of damaging the fader.
Could you identify where it's too tight? Is it the length or the width (or both). I think you'll have to resort to making a tool...
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

ruffrecords

Re: Fitting fader knobs
« Reply #2 on: March 22, 2021, 04:50:50 PM »
In that case, the fix is easy. Put a drop of liquid neoprene glue, press the knob on the fader, then disassemble them, let dry a couple of minutes and you can reinsert it.
Do  you mean something like this?

https://www.amazon.co.uk/Black-Witch-Neoprene-adhesive/dp/B001PAGOYK

So you are suggesting I put a drop in the hole in the knob, place the knob on the fader and then quickly remove it? Let both parts dry and then reassemble.
Quote
Could you identify where it's too tight? Is it the length or the width (or both). I think you'll have to resort to making a tool...
Difficult to tell - it only goes on a mm or so. I might try applying a sliver of emery paper.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

abbey road d enfer

Re: Fitting fader knobs
« Reply #3 on: March 22, 2021, 05:35:33 PM »
Do  you mean something like this?

https://www.amazon.co.uk/Black-Witch-Neoprene-adhesive/dp/B001PAGOYK
Well it looks this one is specifically for repairing frogsuits and may leave dark residues.
I use this.
https://www.amazon.fr/Pattex-1563695-contact-liquide-Blister/dp/B006FUWPCU/ref=sr_1_9?__mk_fr_FR=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=colle+contact+liquide&qid=1616448895&s=hi&sr=1-9


Quote
So you are suggesting I put a drop in the hole in the knob, place the knob on the fader and then quickly remove it? Let both parts dry and then reassemble.
Exactly.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.


abbey road d enfer

Re: Fitting fader knobs
« Reply #5 on: March 23, 2021, 06:32:51 AM »
Pattex seem to have hundreds of different adhesives but 1563695 does not appear on the uk amazon web site. How about this one instead?

https://www.amazon.co.uk/McNett-Black-Witch-Neoprene-Cement/dp/B01KU3LFE6/ref=sr_1_2_sspa?dchild=1&keywords=neoprene+glue&qid=1616493481&sr=8-2-spons&psc=1&smid=A27D7XORWF8L03&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFYTldXUDJWSVI2NlYmZW5jcnlwdGVkSWQ9QTA5NDgwNTUyOUJLMU83Tko3Vk4mZW5jcnlwdGVkQWRJZD1BMDMyMjcxMTFZUElaUkdHSVJINEomd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

Cheers

Ian
I'm not familiar with this one. Is it black or yellow-ish transparent? I just would be concerned about black glue leaving streaks.
The most important parameter IMO is that it was a liquid formula, not gel, because it results in better adhesion to metal and capability of making thin layers.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

ruffrecords

Re: Fitting fader knobs
« Reply #6 on: March 23, 2021, 12:33:54 PM »
I'm not familiar with this one. Is it black or yellow-ish transparent? I just would be concerned about black glue leaving streaks.
The most important parameter IMO is that it was a liquid formula, not gel, because it results in better adhesion to metal and capability of making thin layers.

I will keep looking.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


 

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