2. analog
  3. 175240-169901

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
russ69's avatar
russ69
3,360 posts
 

I'll just throw this out there: Turn the TT on first. 

sailmed OP
43 posts
 

Apparently I've been told this is what I'm trying to remedy:

Spark Suppression circuits are designed to reduce arcing and noise generation produced in switches and relays. When a switch or relay is opened, an arc can develop across the contacts, which over time can erode the contacts.

jea48
4,313 posts
 

A couple of snubber circuits to use. Both circuits are wired in parallel with the switch contacts

First is to wire a capacitor and resistor in series and install the two across the switch contact terminals.

 

Second method is to install an MOV across the contact of the switch.

Application Note: - Inductive Load Arc Suppression - Littelfuse

 

 

 

geof3
1,125 posts
 

As noted, turn on the TT first. Problem easily solved. Then the other way around when powering down.

jea48
4,313 posts
 

As a rule turn on, (closure of the ON/OFF switch contacts), does not cause a high voltage transient. Opening the switch contact, (creating an arc), causes the voltage transient.

To protect all the audio electronic equipment from the high voltage transient all equipment would have to be powered off. Not just the power amplifier.

 

More to discover