Akai reel to reel channel bias problem? - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 24th October 2016, 06:52 AM   #1
6V6dude is offline 6V6dude  Australia
diyAudio Member
 
Join Date: Sep 2014
Default Akai reel to reel channel bias problem?

I have an Akai gx-270d with a problem I've not been able to identify for years. When I record and playback in forward mode, the right channel has more midrange and loss of treble. When I flip the recorded tape around and play it in reverse mode, it's all fine. I've connected test signal on the forward playback head and it comes out the same on both channels which suggests to me that preamps are ok.
I've put it down to two things, faulty head but it looks fine without wear or a Bias. I get similar sound results when I mess around with bias on my Naka 600 - more midrange, treble, etc. But I dont' even know if it is possible the adjust bias only on one channel on the Akai. Maybe it's some other problem, I'd welcome any suggestions, maybe someone has similar experience. I'm sick of playing my tapes backwards only.
  Reply With Quote
Old 24th October 2016, 10:09 AM   #2
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
I would carry out the head adjustment, page 13 & 14 fig 10 of the service manual and demagnetised the head first.
The heads are switched with a relay, I have had issues with this relay. See main schematic page 51.
Download the Akai GX-270-D manuals for free - Hifi Manuals
__________________
Support for Fender, Marshall and all Valve Equipment including Audio Innovations, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 1st November 2016, 10:18 AM   #3
6V6dude is offline 6V6dude  Australia
diyAudio Member
 
Join Date: Sep 2014
Thanks for the link. I cleaned the heads, demagnetized, checked alignment, it's all good. SO now the relay and circuit. I'd bet it's something really simple as per usual.
  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
Looking for Akai 625 reel to reel user manual floridaclear Swap Meet 2 5th January 2011 03:29 AM
Akai Reel to Reel Motor lubrication daniherr Analogue Source 0 23rd April 2008 09:05 PM
Akai reel to reel repair experts needed inside CBRworm Analogue Source 6 4th November 2007 12:24 AM
Akai GX-636 reel to reel coondog Analogue Source 0 17th February 2007 09:03 PM
I have a Akai GX-266D Reel To Reel sound concepts Analogue Source 2 12th October 2006 04:52 PM


New To Site? Need Help?

All times are GMT. The time now is 07:39 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki