Garrard GT-35P-1 cartridge - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Edward Huggins · 23rd Sep 2017, 9:57 pm

The hum may be nothing to do with the turntable, but the amplifier you are using it with. The speed issue may be within tolerance. Does it sound OK to you irrespective of the strobe indications?

peter_sol · 24th Sep 2017, 12:52 am

Re the hum rumble. make sure the bass control on the amplifier is set to zero (that is half way) and the loudness button, if it has one, is off

DanSaxton · 24th Sep 2017, 4:14 pm

I'm just running the turntable through a pre-amp into our home cinema system (JVC) which didn't have any hum previously (and doesn't when running TV etc).

peter_sol · 24th Sep 2017, 4:46 pm

Home cinema systems are bass heavy so may have hum etc from a turntable.

Edward Huggins · 24th Sep 2017, 6:00 pm

The Sub Woofer in your TV system will emphasis any residual hum present. Cinema sound systems are not really designed for music reproduction but for sound-tracks.

lazythread · 25th Sep 2017, 8:37 am

Check to see that the turntable ground lead is connected properly, according to the tuntable manual (I googled it) it is a part of the main audio lead out of the back of the unit. Some pre-amps do not have an earth connection so you'll have to extend the earth lead to connect to your TV system amplifier. Lack of an earth connection between the deck and an amplifier will cause hum issues.

DanSaxton · 25th Sep 2017, 1:42 pm

thanks Richard - yea, i bought a new audio cable with ground - the ground is nicely connected to the pre-amp

GP49000 · 28th Sep 2017, 7:50 am

"...the control for the strobe for 33½ is on the limit and doesn't quite slow the dots down (it was fine before)..."

In addition to the user-accessible speed control adjustment controls on the main circuit board, there are two trimpots, one for each speed, which set the regular adjustment knobs for correct speed at centrepoint. Set the regular speed adjuster knobs to center position, then adjust each appropriate trimpot to achieve correct speed.

23rd Sep 2017, 9:57 pm	#21
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,335	Re: Garrard GT-35P-1 cartridge The hum may be nothing to do with the turntable, but the amplifier you are using it with. The speed issue may be within tolerance. Does it sound OK to you irrespective of the strobe indications? __________________ Edward.

24th Sep 2017, 12:52 am	#22
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Garrard GT-35P-1 cartridge Re the hum rumble. make sure the bass control on the amplifier is set to zero (that is half way) and the loudness button, if it has one, is off

24th Sep 2017, 4:14 pm	#23
DanSaxton Triode Join Date: Jan 2017 Location: Coventry, Warwickshire, UK. Posts: 16	Re: Garrard GT-35P-1 cartridge I'm just running the turntable through a pre-amp into our home cinema system (JVC) which didn't have any hum previously (and doesn't when running TV etc).

24th Sep 2017, 4:46 pm	#24
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Garrard GT-35P-1 cartridge Home cinema systems are bass heavy so may have hum etc from a turntable.

24th Sep 2017, 6:00 pm	#25
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,335	Re: Garrard GT-35P-1 cartridge The Sub Woofer in your TV system will emphasis any residual hum present. Cinema sound systems are not really designed for music reproduction but for sound-tracks. __________________ Edward.

25th Sep 2017, 8:37 am	#26
lazythread Pentode Join Date: Jun 2011 Location: Berkshire, UK. Posts: 124	Re: Garrard GT-35P-1 cartridge Check to see that the turntable ground lead is connected properly, according to the tuntable manual (I googled it) it is a part of the main audio lead out of the back of the unit. Some pre-amps do not have an earth connection so you'll have to extend the earth lead to connect to your TV system amplifier. Lack of an earth connection between the deck and an amplifier will cause hum issues. __________________ Richard It's great when it goes around to make a sound.

25th Sep 2017, 1:42 pm	#27
DanSaxton Triode Join Date: Jan 2017 Location: Coventry, Warwickshire, UK. Posts: 16	Re: Garrard GT-35P-1 cartridge thanks Richard - yea, i bought a new audio cable with ground - the ground is nicely connected to the pre-amp

28th Sep 2017, 7:50 am	#28
GP49000 Hexode Join Date: Mar 2012 Location: Sonoma County, California, USA. Posts: 405	Re: Garrard GT-35P-1 cartridge "...the control for the strobe for 33½ is on the limit and doesn't quite slow the dots down (it was fine before)..." In addition to the user-accessible speed control adjustment controls on the main circuit board, there are two trimpots, one for each speed, which set the regular adjustment knobs for correct speed at centrepoint. Set the regular speed adjuster knobs to center position, then adjust each appropriate trimpot to achieve correct speed.