AudioAficionado.org  

Go Back   AudioAficionado.org > The Lounge > Ye' Old Workshop

Ye' Old Workshop Build it or Break it, Never Fear!

Reply
 
Thread Tools Display Modes
  #1  
Old 06-08-2009, 02:25 PM
Gregory's Avatar
Gregory Gregory is offline
Radical Lab Man
 
Join Date: May 2009
Location: Potomac Falls, VA
Posts: 263
Default Speaker terminals - lugs

Speaker Relay Lug Size

Still looking at the 2205 speaker relay trying to decide how to wrap up Part-1 of the project. I've removed the new relay after installing it several days ago in order to measure the lugs with calipers. Here's a look at the old and new lug sizes:
OLD : 0.206" wide x 0.03" thick
NEW: 0.186" wide x 0.02" think (note thinner metal here)
The original quick connect non-insulated female terminals are 0.225" wide INSIDE where they slip over the lugs. I figure that what you all mean by "squeezing" is applying force to the SIDES with pliers, and not to squeeze them top-to-bottom. Will be checking that out today. Here is a pic of how much of a mismatch the new lugs are:



Old quick connect non-insulated speaker relay terminals compared to NEW relay lugs.


Here is what McIntosh Service Dept. has to say about it:

"Thank you for your inquiry regarding the replacement speaker relay for
your MC2205. Yes, the relay lugs are now smaller which requires us to
squeeze the terminals to ensure a proper connection. The relay
manufacturer had changed the dimensions of the lugs roughly 10 years
ago; this change was approved by our engineering department. Since this
time, we have replaced many of these relays and have not had any issues
with reliability or performance using this method. If you are still
concerned with this connection method and also concerned with signal
path, you could eliminate the mechanical connection by removing the
push-on terminals and solder directly to the lugs. Either method is
acceptable.

I hope that you find this information helpful and that you enjoy your
MC2205 for many years to come."


There are still three options:
1) Squeeze the terminals to grip tighter.
2) Remove the terminals and parallel solder to lugs.
3) Remove and solder the correct terminals for the new lug size and thickness.

-Gregory

McIntosh owner for over 30 years.
--

Last edited by Gregory; 06-12-2009 at 09:23 AM.
Reply With Quote
  #2  
Old 06-12-2009, 09:29 AM
Gregory's Avatar
Gregory Gregory is offline
Radical Lab Man
 
Join Date: May 2009
Location: Potomac Falls, VA
Posts: 263
Default

A quick note to report that squeezing the speaker relay quick connect terminals from the sides will DAMAGE the terminals.. causing them to fold in half along the centerline. NOT RECOMMENDED!!

-Gregory
__________________
McIntosh MR80, MR77, MCD7007, C33, C26, MC2205, MC2505, MQ104, XR6, Sonos, Thiel CS3.5
Reply With Quote
  #3  
Old 04-22-2010, 01:43 PM
tdelahanty's Avatar
tdelahanty tdelahanty is offline
Audio,Trains & Mustangs
 
Join Date: Feb 2010
Location: Indiana
Posts: 1,477
Default

Have you solved the issue with the relay terminals ? I would take the relay to a local parts house and have them match the size. Some RadioShacks still have a good supply of terminal lugs. It is a common lug and should be easy to find. I WOULD NOT SQUEEZE THE ORIGINALS, YOU NEED ALL THE CONTACT AREA FOR CURRENT TRANSFER
__________________
System: ML:5206,5302 Serafino's Nordost Lumin U1 RM15
Reply With Quote
  #4  
Old 04-22-2010, 04:39 PM
Gregory's Avatar
Gregory Gregory is offline
Radical Lab Man
 
Join Date: May 2009
Location: Potomac Falls, VA
Posts: 263
Default

Quote:
Originally Posted by tdelahanty View Post
Have you solved the issue with the relay terminals ? I would take the relay to a local parts house and have them match the size. Some RadioShacks still have a good supply of terminal lugs. It is a common lug and should be easy to find.

I WOULD NOT SQUEEZE THE ORIGINALS, YOU NEED ALL THE CONTACT AREA FOR CURRENT TRANSFER
Yes.. the problem has been solved since last summer. I used calipers to measure the lugs and from that, determind what size to order. The correct terminals for the NEW relay are: Noninsulated Female Quick Disconnect 0.187 x 0.020

They come in single or double-crimp barrel. Forget RadShak, order from McMaster Carr who stock Molex. Their shipping and service are excellent! The link to FQD Noninsulated is: McMaster-Carr


-Gregory
__________________
McIntosh MR80, MR77, MCD7007, C33, C26, MC2205, MC2505, MQ104, XR6, Sonos, Thiel CS3.5

Last edited by Gregory; 04-23-2010 at 12:12 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Audioaficionado.org tested by Norton Internet Security

All times are GMT -4. The time now is 05:55 AM.



Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
©Copyright 2009-2023 AudioAficionado.org.Privately owned, All Rights Reserved.
Audio Aficionado Sponsors
AudioAficionado Subscriber
AudioAficionado Subscriber
Inspire By Dennis Had
Inspire By Dennis Had
Harmonic Resolution Systems
Harmonic Resolution Systems
Wyred4Sound
Wyred4Sound
Dragonfire Acoustics
Dragonfire Acoustics
GIK Acoustics
GIK Acoustics
Esoteric
Esoteric
AC Infinity
AC Infinity
JL Audio
JL Audio
Add Powr
Add Powr
Accuphase - Soulution
Accuphase - Soulution
Audio by E
Audio by E
Canton
Canton
Bryston
Bryston
WireWorld Cables
WireWorld Cables
Stillpoints
Stillpoints
Bricasti Design
Bricasti Design
Furutech
Furutech
Shunyata Research
Shunyata Research
Legend Audio & Video
Legend Audio & Video