Weak sounding "Block Logo" Phase 90 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

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
Thread Tools Search this Thread
Old 9th April 2006, 07:10 AM   #1
diyAudio Member
Join Date: Mar 2006
Location: New York
Default Weak sounding "Block Logo" Phase 90

I've had this pedal for 20+ years, but haven't used it much lately. It sounds a bit weak in it's phasing. (amplitude, AND frequency) The battery is good, jacks, and pot are clean and working. What next?
  Reply With Quote
Old 9th April 2006, 09:42 AM   #2
diyAudio Moderator
pinkmouse's Avatar
Join Date: Apr 2002
Location: Rotherham, England
I suspect you've become habituated to the stronger effects that digital processors have made possible, and it sounds exactly as it did twenty odd years ago. Your choice, stick with the vintage sound or get hold of a schematic and try modding it with the chance of adverse effects.
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 9th April 2006, 08:32 PM   #3
diyAudio Member
Join Date: Mar 2006
Location: New York
You're probably right. I thought it was sounded fine until someone A/B'd it against something else, and told me they thought it was broken. Vintage sound IS usually my preference. Thanks.
  Reply With Quote
Old 11th April 2006, 04:23 PM   #4
Brion55 is offline Brion55  United States
diyAudio Member
Join Date: Apr 2005
Location: Kansas
Send a message via Yahoo to Brion55
If I remember right the Phase 90 had 4 stages of phase shift while many others used 6 or 8 for a "deeper" effect. Maybe that's the problem.
How do I put the smoke back in this thing?
  Reply With Quote
Old 21st April 2006, 09:22 PM   #5
cerrem is offline cerrem  United States
diyAudio Member
cerrem's Avatar
Join Date: Jun 2005
Location: San Diego, CA
I own several of the older script logo MXR Phase 90's...
There are several things that occur that make them weaker..
First the bypass caps are tantulaum.. Tantalum has very short life span and you can replace it with a electrolytics...It's up to you to choose the quality of the electrolytic.... The other major thing is the phase adjustement...There is a small trim pot on the circuit board...you can adjust this with a scope or by ear with guitar signal going through..it is a very sensitive adjustment where you center adjust it for strongest phase...
Contact me if you need additionla assistance..

  Reply With Quote


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
JVC "EXU-901a" (KRELL KPS-25sc Phase Tech CT-1 CT1) better than VAM1254, CDpro2LF ? tiefbassuebertr Digital Source 14 12th January 2012 08:12 AM
H class amp sounding "boxy" Pbassred Class D 2 21st August 2008 10:08 AM
MXR PHASE 90- Block Logo Schematic? tonemonster Instruments and Amps 0 26th September 2006 12:54 AM
What are "good" sounding resistors for my aleph p Shaun Perez Pass Labs 6 29th July 2003 01:46 PM

New To Site? Need Help?

All times are GMT. The time now is 04:21 PM.

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