Thorens TD 160 "pop" revisited


I realize that I may be late to this party, however I'm seeking some clarification and am hoping to get the final answer to this issue. 

Just finished setting up new (to me) system with a beautiful TD 160, Rega 300 tonearm and Pete Riggles VTAF modification, along with his counterweight system. Connected to a restored Accuphase E-202, sending to a pair of Klipsch Forte IV. 

To my ears, the sound is heavenly. 

But: when I switch on the tt, there is a LOUD POP. I've seen discussions regarding snubbers and various capacitors placed within the tt, and yet others have said that failed to solve issue. Another post said he finally find the solution was adding a resistor somewhere unspecified. 

Has anyone come up with a final reason why this happens and a proven solution? 

sailmed

Apparently, if left uncorrected it will eventually fry the contacts.

Or worse, damage electronic equipment.

We would like to think that the AC or DC power supplies we use to power our circuits are both clean and well-regulated supplies. However, the switching of AC inductive loads or the switching of DC relay contacts and DC motors as part of a micro-controller project all combine to produce a quality of power supply that is difficult to maintain.

These inductive switching transients occur when some form of inductive or reactive load, such as a motor, a solenoid coil or a relay coil, is suddenly switched off. The rapidly collapsing of its magnetic field induces a transient voltage which becomes superimposed onto the steady-state supply. These inductive switching voltage transients can reach the 1,000’s of volts.

Transients are very steep voltage steps that occur in electrical circuits due to the sudden release of a previously stored energy, either inductive or capacitive, which results in a high voltage transient, or surge being created. This sudden release of energy back into the circuit due to some switching action creates a transient voltage spike in the form of a steep impulse of energy which can in theory be of any infinite value.

.

transients are bad as they can damage electronic equipment and therefore need to be suppressed and controlled.

 

 

I wanted to provide an update on the solution to the pop which occurred on both opening and closing the power switch on my TD 160. This switch works in tandem with the speed control selector. As many have suggested, I had a snubber installed by a friend who knew just what was needed. ( Thank you Sanjib)  

A 0.1 microfarad/450 vdc capacitor was placed in series with a 100 ohm resistor across the switch. This served to prevent the arc across the air gap. 

Problem solved! The pop is gone completely. Thanks to everyone who contributed. 

I hope this information helps others who encounter this issue. 

 

 

Thanks for following up! I am sure future 160 owners will find this useful…