Mutron III power switch

[Wood and Wire]

Plugging in the ac power adapter also disconnects the batteries,

be careful with that : it says in the manual that using the AC power supply whilst batteries are installed, will charge the batteries (though it makes no mention of using rechargeable batteries in the device), and that if batteries are already fully charged (or presumably not rechargeable) it could result in the batteries rupturing / leaking, and damage to the unit.

I'd go for either / or, and I'm currently looking at fabricating a version of the original PSU connector, using 3 metal prongs, some Sugru, and a pair of flying leads to 2 discrete 9V outputs from my pedal board power supply.

 

[GonzoBfiddy]

Thanks, but you might want to dig out that Mutron and have a look, because they take batteries and have a power switch

Mine doesn't take batteries and has no power switch.

 

[devnulljp]

Thanks, yeah I get that, but what happens if you’re playing through the pedal with the switch off?

No signal

 

[Pauly 4001]

be careful with that : it says in the manual that using the AC power supply whilst batteries are installed, will charge the batteries (though it makes no mention of using rechargeable batteries in the device), and that if batteries are already fully charged (or presumably not rechargeable) it could result in the batteries rupturing / leaking, and damage to the unit.

I'd go for either / or, and I'm currently looking at fabricating a version of the original PSU connector, using 3 metal prongs, some Sugru, and a pair of flying leads to 2 discrete 9V outputs from my pedal board power supply.

You mean something like this?

I paid a small fortune in about 1978 to have that plug rebuilt. I'm glad I did in retrospect, it was becoming unusable.
Gee:
The photographer accidentally managed to get the control panel of a Mellotron M400 in each shot. I'm sure it wasn't intentional.

 

[Pauly 4001]

be careful with that : it says in the manual that using the AC power supply whilst batteries are installed, will charge the batteries (though it makes no mention of using rechargeable batteries in the device), and that if batteries are already fully charged (or presumably not rechargeable) it could result in the batteries rupturing / leaking, and damage to the unit.

I'd go for either / or, and I'm currently looking at fabricating a version of the original PSU connector, using 3 metal prongs, some Sugru, and a pair of flying leads to 2 discrete 9V outputs from my pedal board power supply.

Sorry:
I had the broken connector to the original Musitronics PS-1 rebuilt.

 

[Dirk Diggler]

I suppose you could replace the switch with a True Bypass switch.
Not a good move if you plan to sell it to a collector.

But yeah unless you have power, no signal passes through.
And the switch was to save batteries.

Last choice it to put it in a looper.

 

[Wood and Wire]

You mean something like this?
View attachment 4533782 View attachment 4533779 View attachment 4533780 View attachment 4533781
I paid a small fortune in about 1978 to have that plug rebuilt. I'm glad I did in retrospect, it was becoming unusable.
Gee:
The photographer accidentally managed to get the control panel of a Mellotron M400 in each shot. I'm sure it wasn't intentional.

exactly like that.

 

[Wood and Wire]

Sorry:
I had the broken connector to the original Musitronics PS-1 rebuilt.

View attachment 4533784

Yeah, I'm slightly modernising it, by going from the 3 prong, to two flying leads - as used with typical pedal board power supplies, and connecting to two isolated 9V outputs.

Until I get busy with the Sugru, it will just be the two flying leads to two 9V battery connector tabs, in the battery compartment.