Hello!
I've had some success adding speed control pots and aux inputs to small dictaphones but I've recently got myself a reel to reel and I would love to add a few things to it. Problem is I'm a lot less sure with how to approach this and not break the machine, the internals look a lot more intimidating plus it's 220V here so I would really appreciate if anyone could offer some guidance?
Essentially I would like to do 3 mods:
- speed control
- reverse switch
- erase head switch
I'm not adept at electronics by any means but I'd assume the speed pot would have to be a 100k potentiometer wired to the motor or the motor controller?
To reverse the polarity of the motor I have a DPDT switch but I'm not sure where should I wire it to (the motor on this is 4-pole).
I'm also aware that disabling erase head will mess with the bias unless you switch it to a resistor of same impedance, question here is what impedance would it have to be and where would I wire it?
Thank you in advance for any help, I would really appreciate it!
Here's a service manual for TK-14, I assume it's very similar to the 14L (only one I managed to find).
WeTransfer
I've had some success adding speed control pots and aux inputs to small dictaphones but I've recently got myself a reel to reel and I would love to add a few things to it. Problem is I'm a lot less sure with how to approach this and not break the machine, the internals look a lot more intimidating plus it's 220V here so I would really appreciate if anyone could offer some guidance?
Essentially I would like to do 3 mods:
- speed control
- reverse switch
- erase head switch
I'm not adept at electronics by any means but I'd assume the speed pot would have to be a 100k potentiometer wired to the motor or the motor controller?
To reverse the polarity of the motor I have a DPDT switch but I'm not sure where should I wire it to (the motor on this is 4-pole).
I'm also aware that disabling erase head will mess with the bias unless you switch it to a resistor of same impedance, question here is what impedance would it have to be and where would I wire it?
Thank you in advance for any help, I would really appreciate it!
Here's a service manual for TK-14, I assume it's very similar to the 14L (only one I managed to find).
WeTransfer
Welcome.
> assume the speed pot would have to be a 100k potentiometer wired to the motor or the motor controller?
NO.
There is no "controller". The motor runs in-sync with the 50Hz power line. If you take it to a 60Hz place it will run 20% fast. To vari-speed you need a variable-Hz oscillator and a Power Amp with 230VAC output.
Reversing this motor probably means taking it apart and assembling it differently.
This is a cute tape machine but NOT a good candidate for what you want to do.
> assume the speed pot would have to be a 100k potentiometer wired to the motor or the motor controller?
NO.
There is no "controller". The motor runs in-sync with the 50Hz power line. If you take it to a 60Hz place it will run 20% fast. To vari-speed you need a variable-Hz oscillator and a Power Amp with 230VAC output.
Reversing this motor probably means taking it apart and assembling it differently.
This is a cute tape machine but NOT a good candidate for what you want to do.