8mm Forum: Audio Vinyl Turntable Question

»	8mm Forum » General Yak » Audio Vinyl Turntable Question

UBBFriend: Email this page to someone!

Author

Topic: Audio Vinyl Turntable Question

Brad Kimball
Phenomenal Film Handler

Posts: 1171
From: Highland Mills, NY USA
Registered: Jun 2003

posted January 11, 2018 04:49 PM

I have a Sony PSLX-250H non-usb belt driven t/t connected to a phono amp (turned off the turntable’s built in pre amp) and then connected a pair of Harmon Kardon pc speakers. Now I have no issues with the clarity or the volume, but I can’t seem to eliminate a hum that can be heard even when nothing is playing. I get the hum whether I use an external phono amp or the unit’s built in pre amp. The t/t does NOT have a ground wire to connect so it all must be self-contained. Hooked the t/t to my daughter’s boom box and the hum was there so it’s definitely eminating from the t/t. Thoughts....? Could it just be the way the $99 t/t was built?

| IP: Logged

Maurizio Di Cintio
Jedi Master Film Handler

Posts: 977
From: Ortona, Italy
Registered: Jan 2004

posted January 11, 2018 05:39 PM

Check the wires from the cartridge and/or the wires you use to cnnect this unit tothe other ones you used.

--------------------
Maurizio

| IP: Logged

Bill Brandenstein
Phenomenal Film Handler

Posts: 1632
From: California
Registered: Aug 2007

posted January 11, 2018 06:48 PM

If there's no ground wire, I'd venture that something's missing. I've never heard of a cartridge without one. And without one, every one I've ever used hums loudly. Good luck, Brad.

| IP: Logged

Brad Kimball
Phenomenal Film Handler

Posts: 1171
From: Highland Mills, NY USA
Registered: Jun 2003

posted January 11, 2018 06:59 PM

The cartridge is all intact. The rca wires I use I connected to other elements and no hum. The t/t manual specifies that the unit is grounded internally plus there’s no slot in the back to insert one if I wanted to.

| IP: Logged

Brad Kimball
Phenomenal Film Handler

Posts: 1171
From: Highland Mills, NY USA
Registered: Jun 2003

posted January 11, 2018 08:38 PM

| IP: Logged

Brian Fretwell
Phenomenal Film Handler

Posts: 1785
From: London, UK
Registered: Jun 2014

posted January 12, 2018 04:08 AM

Ive had hum when the push on connectors for the wire at the cartridge end have been a little loose or badly connected try touching the insulation around them when the amp is on and see if the hum decreases or increases. If it does there is a bad connection there and they may need tightening or cleaning.

| IP: Logged

William Olson
Master Film Handler

Posts: 287
From: Poughkeepsie, NY USA
Registered: Jun 2010

posted January 12, 2018 11:59 AM

Something internally is not grounded.

| IP: Logged

Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted January 13, 2018 08:04 AM

Hi Brad, had a similar problem with technics sl 1200 and this does have a grounding cable, if the head shell screws off the arm, check the connection pins in the arm as these can get crud on them and the tiny electrical contact between the two is compromised, I used a tiny piece of emery paper on a match stick and cleaned each one, fixed the humming and did not return.

| IP: Logged

Brad Kimball
Phenomenal Film Handler

Posts: 1171
From: Highland Mills, NY USA
Registered: Jun 2003

posted January 14, 2018 05:06 PM

The cartridge is permanent and not removable. Only the stylus is removable. When I place my finger on the ground screw on the back of my phono amp the hum disappears. The t/t definitely does not have a ground cable nor anywhere to connect one. I don’t want to dis-assemble the t/t because that could result in more problems than I want. Not being electrically skilled I could see myself getting into a pile of poo.

| IP: Logged

Steven J Kirk
Jedi Master Film Handler

Posts: 873
From: Southern England
Registered: Apr 2008

posted January 15, 2018 06:54 AM

Turntables need grounding or there will be a hum. You say you are using a separate phono amp but is that grounded? When you touch the grounding terminal you are yourself making the ground so there is the proof it needs it. A hi fi amplifier with a phono input will have a grounding screw and that is for the turntable.

--------------------
VistaVision
Motion Picture High-Fidelity

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2