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Oracle Delphi MK IV speed problem
Oracle Delphi MK IV speed problem
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Old 26th November 2003, 07:05 AM   #1
EricSisi is offline EricSisi  France
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Join Date: Nov 2003
Location: Paris
Question Oracle Delphi MK IV speed problem

Hello, I am new here. Maybe someone have an answer for this problem I have. I have a very nice Oracle Delphi MK IV. Not upgraded. I am having problems with the speed. I can't get it to go at the right speed. It is too slow. Using the adjustments do change the speed but not up to the correct one. Any ideas? Maybe I need a new motor. Or the upgrade.

Many thanks,

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Old 26th November 2003, 08:02 PM   #2
Audiofanatic is offline Audiofanatic  Netherlands
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Join Date: Oct 2002
Location: The Netherlands, Utrecht
Default Oracle Delphi

Hi Eric Sisi,

Check your Power supply (Wall wart if you have one) voltage.
If it varies to much a few volts than try a otherone.

Make shure it's AC or if you have a DC PSU check polarity.

All the best.

Be nice to animals.
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Old 2nd December 2003, 02:50 PM   #3
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK
Describe the problem in more detail, for example history,
and give some more info about the motor and how the
speed is adjusted.

May be able to help, or make some suggestions, /sreten.
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Old 5th December 2003, 11:38 AM   #4
m.parigi is offline m.parigi  Italy
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Join Date: Jan 2002
Location: Italy
Check out this thread: I used to have the same problem!


Hope this helps!
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Old 6th March 2016, 11:39 AM   #5
MPS is offline MPS  Finland
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Join Date: Aug 2009
It's an old thread but compared to the mk IV it's quite recent ;-)

Anybody know how the speed control actually operates?
The motor is Berger Lahr 50/8 (?)
On the main circuit board is a wien bridge oscillator with separate adjustment for 33 1/3 and 45 rpm. There is another common adjustment on the (tiny) operating board and this controls the run / speed / stop functions, it's somehow giving a signal to the oscillator.
Looking for possibility to improve speed stability.
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