SX74 woes
Moderators: piaptk, tragwag, Steve E., Aussie0zborn
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
SX74 woes
Afternoon troubleshooting. Isolated to the right channel of the sx74.
Getting distortion in the 150-350hz range when pushed beyond certain dB.
I swapped every card in the rack as well as all inputs coming in.
Its almost like it was dropped and inside a part is loose that rattles when this freq range threshold is reached. the real lows do not seem to affect..
luckily spare head arrives tomorrow and then mine off to see AG
Getting distortion in the 150-350hz range when pushed beyond certain dB.
I swapped every card in the rack as well as all inputs coming in.
Its almost like it was dropped and inside a part is loose that rattles when this freq range threshold is reached. the real lows do not seem to affect..
luckily spare head arrives tomorrow and then mine off to see AG
cutting lacquers-vms70 system
- concretecowboy71
- Posts: 569
- Joined: Mon Mar 08, 2010 10:13 am
- Location: Cleveland, Ohio, USA
- Contact:
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
Remove the four screws for the depth/heating control panel. Gently pull the panel off. Behind the panel is where the audio signal, feedback signal and command signals for suspension box all come together. I looked inside of mine and noticed a HUGE drip of oil that was about to fall on the wiring harness in there. Maybe you had some oil drip and it is casuing a small short of something??? Working having a look.
Cutting, Inventing & Innovating
Groove Graphics, VMS Halfnuts, MIDI Automation, Professional Stereo Feedback Cutterheads, and Pesto 1-D Cutterhead Clones
Cutterhead Repair: Recoiling, Cleaning, Cloning of Screws, Dampers & More
http://mantra.audio
Groove Graphics, VMS Halfnuts, MIDI Automation, Professional Stereo Feedback Cutterheads, and Pesto 1-D Cutterhead Clones
Cutterhead Repair: Recoiling, Cleaning, Cloning of Screws, Dampers & More
http://mantra.audio
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
thanks O66 as been in there too already. the good thing is every connection has been cleaned. one mind thinks i am being hypercritical with my cuts as I check everything on 3 turntables with such light weight on the cartridge that any issue is detected.
'normal' weight on the playback and there is not any issue. i am trying to discover why not on both sides when it appears.
after all the cleanup/reconnects cut a decent length dance record very loud and fit great
'normal' weight on the playback and there is not any issue. i am trying to discover why not on both sides when it appears.
after all the cleanup/reconnects cut a decent length dance record very loud and fit great
cutting lacquers-vms70 system
- jtransition
- Posts: 85
- Joined: Fri Apr 18, 2008 7:39 am
- Location: Saarf London
Distortion
Hello D,
Can you hear this noise on the feedback monitor whilst cutting?
Are you using Concord playback stylus?
Jason
Can you hear this noise on the feedback monitor whilst cutting?
Are you using Concord playback stylus?
Jason
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
Re: Distortion
You cannot hear this on feedback monitor.jtransition wrote:Hello D,
Can you hear this noise on the feedback monitor whilst cutting?
Are you using Concord playback stylus?
Jason
I have three different playback stylus and stations.
SME are with shure head+stylus on the vms+ 2x 1200 in the other room , 1 with concord and one with another orotofon.
cutting lacquers-vms70 system
- jtransition
- Posts: 85
- Joined: Fri Apr 18, 2008 7:39 am
- Location: Saarf London
Murphy
Is it worse on the concord?
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
- jtransition
- Posts: 85
- Joined: Fri Apr 18, 2008 7:39 am
- Location: Saarf London
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
- GROOVE-GUARD
- Posts: 5
- Joined: Wed Apr 29, 2009 9:15 am
Re: SX74 woes
Hi ,
first > if the same distortion with your backup head ???
no > listen the fb monitorlevel without the 9 db feedback and with max +8db , push the level in carefully steps (around 100 - 200 hz)
when you listen bad harmonics it´s a head problem in the mechanical parts > fb glue, ceramic broken, damping bad and so on ...
second > if your styli hole perfekt ???
pray for the head ...
first > if the same distortion with your backup head ???
no > listen the fb monitorlevel without the 9 db feedback and with max +8db , push the level in carefully steps (around 100 - 200 hz)
when you listen bad harmonics it´s a head problem in the mechanical parts > fb glue, ceramic broken, damping bad and so on ...
second > if your styli hole perfekt ???
pray for the head ...
- dietrich10
- Posts: 844
- Joined: Wed Jan 16, 2008 2:18 pm
- Location: usa
- Contact:
Re: SX74 woes
GROOVE-GUARD wrote:Hi ,
first > if the same distortion with your backup head ???
yes
no > listen the fb monitorlevel without the 9 db feedback and with max +8db , push the level in carefully steps (around 100 - 200 hz)
when you listen bad harmonics it´s a head problem in the mechanical parts > fb glue, ceramic broken, damping bad and so on ...
no issue fb monitor. with those settings or others.
second > if your styli hole perfekt ???
yes
problem solved
pray for the head ...
cutting lacquers-vms70 system
- jtransition
- Posts: 85
- Joined: Fri Apr 18, 2008 7:39 am
- Location: Saarf London
Murphy
D,
Did you solve this and what was the issue?
Jason
Did you solve this and what was the issue?
Jason