Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th July 2004, 06:33 PM   #1
sev is offline sev  United States
diyAudio Member
 
Join Date: Jul 2004
Location: New York City
Question Fairchild 412 running too slow

Hi everyone,

I am having trouble with my Fairchild 412 turntable. I replaced both belts, cleaned and oiled all bearings, but it is still running a little slow. Any ideas what I could do about that?

Thanks,

sev
  Reply With Quote
Old 26th April 2005, 05:04 AM   #2
revaud is offline revaud  Canada
diyAudio Member
 
Join Date: Apr 2005
Location: Toronto
I have a Fairchild 412 (new belts etc) and it has the same problem as yours. Did you ever get it solved?Mine runs about 30RPM.
  Reply With Quote
Old 26th April 2005, 09:16 PM   #3
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Do these use AC or DC motors? If DC it could be a simple matter of replacing whatever is used to adjust playback speed.

If a trimp pot was used it could have drifted or worn out over time and require tweaking. I do know that after time some trimmers can just fail. If the circuit fairchild used was fairly accurate anyway, then full rotation of the pot could alter the speed from say 30-36 RPM and was factory set before being sold. If the pot dies then it could default the biasing speed to 30. Much like a quiescent setting in an amp can change and sometimes kill an amp if poorly designed.

If its an AC motor then the speed is set by the frequency of the mains and is unlikely to change that much.

Not much to go on but just a thought.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!
  Reply With Quote
Old 27th April 2005, 10:01 PM   #4
revaud is offline revaud  Canada
diyAudio Member
 
Join Date: Apr 2005
Location: Toronto
Default Fairchaild 412 Running Slow

I figured it out. The motor had to be taken apart (easy to do) and the pully shaft and well cleaned and oiled. That did it.
  Reply With Quote
Old 27th April 2005, 10:34 PM   #5
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Excellent
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!
  Reply With Quote
Old 13th September 2006, 08:42 PM   #6
diyAudio Member
 
Rjones5296's Avatar
 
Join Date: Mar 2002
Location: Dayton Ohio
Send a message via AIM to Rjones5296
Default Fairchild running fast

Same kind of issue here, my fairchild 412-2 runs a little fast.
I can't find any issues with the table, IM planning on replacing both belts. My Fairchild is a 2 speed and you can vary the speed slightly by turning the speed selector knob. But even with this it still runs aboout 34 rpm.
If all esle fails ill have the top pulley turned down slightly, or have a pulley made to a smaller size.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rega Planar 2 Turntable running slow OXAUDIO Analogue Source 4 17th February 2009 06:47 PM
What advantages running ported midbass if you are running a sub? mitchyz250f Multi-Way 3 20th May 2008 02:34 PM
WTB Fairchild 260 transformers WBS Tubes / Valves 4 5th March 2007 10:51 AM
Slow running Akai GX4000D Nam402 Analogue Source 6 6th July 2006 10:52 PM


New To Site? Need Help?

All times are GMT. The time now is 07:25 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2