Got rid of mine precisely for the same reasons, constant speed fluctuation and extremely poor service from manufacturer. Too bad because it sounds amazingly good when it runs at the right speed.
Not sure if a speedbox from the likes of Pro-ject may work but I couldn't put up any longer with Arthur's unwillingness to help me through the process.
They also have an external power supply that comes standard with the Sapphire but not sure how much it will cost separately.
Your Vector mk1 uses a DC motor. The following information is taken from the Funk Firm website and describes Arthur's point of view between AC and DC motors:
"AC motors follow (lock to) the supply frequency which drives them.
DC motors have no such internal lock.
Left unchecked they can drift from the original setting. This can be for many reasons e.g. temperature.
The inclusion of a servo in the power supply design mitigates against this problem.
A good servo holds the motor speed without intrusion. A bad servo is either inaccurate or hunts or acts too severely.
Unfortunately good servos are not easy things to design.
Not surprising that manufacturers would rather take the easy option."
Arthur has had many issues with speed fluctuation in the past and now claims to have perfected the servo in the power supply to avoid speed fluctuation:
"The Funk Firm has continued to develop and expound the virtues of DC motor systems and offers them as upgrades for other turntables.
K-Drive is a class A design with a unique single ended output. This gives it extremely low distortion and a low output impedance with which to control the motor.
VX is a more cost effective alternative. It utilises elements of K-Drive in a more cost effective package."
I hope this helps and good luck in getting the speed right!
Happy listening!
Not sure if a speedbox from the likes of Pro-ject may work but I couldn't put up any longer with Arthur's unwillingness to help me through the process.
They also have an external power supply that comes standard with the Sapphire but not sure how much it will cost separately.
Your Vector mk1 uses a DC motor. The following information is taken from the Funk Firm website and describes Arthur's point of view between AC and DC motors:
"AC motors follow (lock to) the supply frequency which drives them.
DC motors have no such internal lock.
Left unchecked they can drift from the original setting. This can be for many reasons e.g. temperature.
The inclusion of a servo in the power supply design mitigates against this problem.
A good servo holds the motor speed without intrusion. A bad servo is either inaccurate or hunts or acts too severely.
Unfortunately good servos are not easy things to design.
Not surprising that manufacturers would rather take the easy option."
Arthur has had many issues with speed fluctuation in the past and now claims to have perfected the servo in the power supply to avoid speed fluctuation:
"The Funk Firm has continued to develop and expound the virtues of DC motor systems and offers them as upgrades for other turntables.
K-Drive is a class A design with a unique single ended output. This gives it extremely low distortion and a low output impedance with which to control the motor.
VX is a more cost effective alternative. It utilises elements of K-Drive in a more cost effective package."
I hope this helps and good luck in getting the speed right!
Happy listening!