Question about Gemini XL-400II Turntable

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One of my turntables is spinning out of control, no reaction to pitch or RPM changes. What could this be?

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Sounds like the motor control circuitry has a fault, beyond the effects of maintenance adjustments. Quite often, a transistor and perhaps other active electronic components are used to provide a stable calibrated voltage that drives the platter motor. If one of these components fails, the drive motor can be fed the larger unregulated supply voltage; hence, the out of control platter speed. This can happen to belt drive or direct drive turntables. Not so with the old rim drive units. Unless you have technical experience in this area, you should have a stereo type tech look at it. I'd avoid the high end audiophile type repair services. Shop around for an old school regular tech, and the repair should be relatively inexpensive. FYI, I've seen these hi end shops charge $50 or $60 for a turntable belt that should only cost around $20. If you feel the repair estimate is too much, you can find good used turntables at some stereo stores, or even at some thrift shops for a fraction of replacement cost. Depends on your standards.

Posted on Oct 07, 2010

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1 Answer

Why is this turntable running slow?


It depends which type of turntable it is. If a belt one then change the belt, make certain you make a note of how the belt fits before removing it.

Direct drive turntables are more difficult. As it could be any number of faulty parts that cause it.
A build up of grease or dirt in any type of deck can slow the speed down.

A faulty motor on both types of deck will also cause it.

Sep 07, 2015 | Audio Players & Recorders

1 Answer

My Gemini TT 02 gets stuck at 45 RPM. To get back to 33 you have to turn off and on again. Also the pitch is wildly out by about +7. Is there any way I can repair this?


Your terminology confuses.

Point 1. Why to you say, "Stuck?" Does it not make sense as a possiblity that the designers sought to prevent rotaton speed from being changed mid playback, especially on, say, an LP (long play) album with different side (stereo instead of 45 monaural) grooving. What would be the imperative of changing record speed in that manner...only one record type will play at a time. If changer, only one type record seriies can be played, all at the same speed.

Point 2. ...about "pitch...wildly out by about +7.

First, what are you meaning by pitch and by + (not -) 7. Since there is, to my knowlege, no record spin criterion known as pitch, are you referring to spin speed; hence to playback sound frequency, whether steady state or variable? If there is no user control of platter rotation speed on your unitn there would be little you can do other than to ensure all parts above and below platter are running smoothly with no drag or interference...possibly even lightening the record load on the platter, if a changer; and making sure records are clean to prevent slippage by washing with water or soap and water and air drying--avoid label. If your turntable is optically speed controlled (by timing marks on platter rim) those are typically adjustable to hasten or slow platter speed and therefore playback frequency pitch to your liking. "Wild variation" could reflect mechanical impedance as indicated above. Also check for record warping by trying known true record playback. Finallly, wild variation could be indicator of platter motor end of life cycle. Start pricing a motor if nothing helps.

I still don't follow the significance of the speculative(?) 7. Please explain if possible.

Sep 27, 2014 | Audio Players & Recorders

1 Answer

Should i take it some where to change the pitch controlers or could i do it myself?....


what do u mean change the pitch controllers? you cant change the pitch controlers its set into the motor or your techs. if its broken have it sent out and fixed. dont try to do it yourself unless you are 1001% sure you know what you are doing

May 27, 2011 | Technics SL-1210 Turntable

1 Answer

I have a Sherwood PD - 913 R and the pitch seems to be spinning out of sync which makes the RPM"s not right for 33 or 45 speeds, any help on what could be the cause is appreciated. There is a pitch...


The turntable motor might be the problem, if the grease is old it becomes hard causing the turntable to run slow, by your description we can rule that out since you indicate it runs to fast. therefore it is the voltage that powers the motor with a regulator "keeps voltage constant" or the motor itself will be the problem. The pitch control allows a small change in speed when required.

Dec 30, 2010 | Audio Players & Recorders

1 Answer

Akai Ap-003 belt drive turntable pitch problem


Hi!
Make shure that is a 50Hz turntable. If you connect a 60 Hz turntable in a 50 Hz system, the result is aprox 28 RPM in the 33 RPM position/

Dec 31, 2009 | Audio Players & Recorders

2 Answers

My stanton t50 turntable plays too fast even when the pitch fader is at the slowest speed


You need to calibrate your pitch control. This requires a small precision screwdriver (similar to something you would repair eye glasses with). If you look under the turntable where the pitch control is you will find 2 small holes, 1 marked 33 and 1 marked 45. Turn the turntable on and set the pitch control lever to zero pitch. While the turntable is spinning insert the screw driver into the pitch calibration hole under the turntable and twist the potentiometer back and forth until the turntable pitch is zero (I believe clockwise is faster, counterclockwise is slower as you look up from the bottom of the turntable). This is a fine tune adjustment and will not require much turning to adjust the speed (1 or 2 mm's) either way should start to bring you into zero pitch. The platter speed can be verified by the little dots on the rim of the platter. They should appear stationary in strobe light on the power switch when you are at zero pitch. When you are adjusting the speed you will observe the dots on the platter rim spinning clockwise and then counterclockwise as you adjust the fine tuning. Fine tune the speed until the dots appear stationary and you will be back to zero pitch. You have to adjust the turntable at both speeds 33 and 45 using the correct fine tuning hole under the turntable. My personal experience is it is easiest to do this with 2 people. 1 person to hold the turntable level and running, while the other adjusts the fine tuning. Hope this helps.

Oct 22, 2009 | Stanton T.50 Turntable

2 Answers

Turntable spins too fast at both speeds


this is belt driven turntable....have you tried adjusting it via the pitch control or even getting another belt for that turntable....

Apr 12, 2009 | Audio Technica AT-LP2D Turntable

1 Answer

Speed control issue


Not sure I understand what you need done. The 1200 has a pitch control, which allows you to control it's speed. Do you want to disable the 33/45rpm function, and assign that to the pitch control, so instead of controlling pitch, you control the RPM? This will put quite a strain on the drive circuits of this unit, but it can be done. Although, not an easy modification, as you will have to modify multiple resistors and IC's on the main board. This should only be professionally done.

- OPTiC
Technics Repair Videos
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Jan 18, 2009 | Technics SL-1200 Turntable

1 Answer

Technics Turntables


Sounds like you need a new pitch control. YOu can purchase a pitch control separately and install yourself, however soldering is required. You will have to solder off the old board, and solder on the new board.

You can purchase the PART HERE

- Davis
DJ PRO AUDIO
www.djproaudio.com
www.repairnyc.com
www.1200s.com

Jul 16, 2008 | Technics SL-1200MK2 Turntable

1 Answer

Pitch Control


use tap button your mixer to get exact bpm if you dont havr this , buy a new mixer i suggest pioneer 800

Sep 29, 2007 | Gem Sound DJ-2100 Turntable

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