Tascam Model 12 Knobs

[tangucho]

For me, it has now become a quest, "a quest for fun!", or in this case, a quest to just to finally have the knowledge. I contacted Tascam today and they gave me a number to call, which I will do tomorrow. So, hopefully I will have an update! Thanks all.

Fantastic. I'll join you in your quest. I already ordered Chroma Caps from DJTechTools because my only complain about M12 is that completely lacks of light on stage.....

 

[T0malo]

 

[T0malo]

 

[T0malo]

sorry for the delay. The red preamp knobs are different some have extended pieces in them

 

[-mjk-]

accidental disinsertion

This is the most gangster tech term I have ever heard.

 

[shredd]

This is the most gangster tech term I have ever heard.

Sort of like "drive-by life deprivation"...

 

[Max Relic]

This is the most gangster tech term I have ever heard.

Tech mobsters at work: put your hands in the air! (and don't touch the knobs)

 

[D. Tempest]

It appears to me that the pot shaft was damaged when you removed the knob. So that tells me these damn things are stuck on.

 

[Max Relic]

D-shaft knobs require on-axis (vertical) pulling force to come off. If any, the shaft in the picture looks like it got twisted from too much torque (rotational force).

 

[D. Tempest]

I don't think the Model 12 is using using standard 3/4 D shafts. If you look carefully, it looks like a portion of the shaft was broken when it was removed. You can see the broken points marked in this blown up pic. I included a D shaft potentiometer from my shop to compare. You will notice that on actual D shafts, there is a base to them for the knob to rest straight on. So, my thinking is that they are using some kind of adhesive on their knobs. Or perhaps a type of clip that grips the shaft. Take a look at the two, compare them, and let me know what you think.

 

[Phil Tipping]

my thinking is that they are using some kind of adhesive on their knobs

So did you try the hair-dryer trick? Should be simple to check... as long as you don't overcook it

 

[D. Tempest]

I have a heat gun for electronics, just haven't tried it in fear I will damage the unit. I'm amazed no one here has repaired a Model 12 or has one that isn't working to experiment with.

 

[Phil Tipping]

Just a warm setting should be ok, or hold the gun further away. With the Korg gear, they used something like double-sided sticky tape on the top of the shaft, so this was easy to soften with gentle heat.

 

[D. Tempest]

I'll try that and will leave an update. Wish me luck!

 

[Max Relic]

I don't think the Model 12 is using using standard 3/4 D shafts. If you look carefully, it looks like a portion of the shaft was broken when it was removed. You can see the broken points marked in this blown up pic.

The original picture isn't detailed enough to build a reliable diagnosis upon, that's why I expressed a cautious guess ("looks like"). I see a slightly twisted shaft but it could be just be a mix of reflection, bad lighting and low resolution, based on decades of practice in macrophotography and electronics.
Don't remember if I wrote it before, maybe Tascam selected tight-fit D-shaft knobs for its Model series so they could stay in place without the need of glue.
Or they did use glue which would require some warm-air softening.