FDP Home Page / FDP Forum / FAQ's

The FDP is made possible by the following companies and individual members like you.
Please use the links below to show them we value their sponsorship.

Guitar Center

Sweetwater

Yellowjackets Tube Converters

Apex Tube Matching

Jensen Loudspeakers

Antique Electronics Supply

MOD KITS DIY

Amplified Parts

WD Music

Musician's Friend

Amazon


* God bless America and our men and women in uniform *

* Illegitimi non carborundum! *

If you benefit and learn from the FDP and enjoy our site, please help support us and become a Contributing Member or make a Donation today! The FDP counts on YOU to help keep the site going with an annual contribution. It's quick and easy with PayPal. Please do it TODAY!

Chris Greene, Host & Founder

LOST YOUR PASSWORD?

......................................................................

   
FDP Jam
Calendar
Find musicians
in your area!
  Search the Forums  

FDP Forum / Fender Amps: Vintage (before 1985) / Altec Lansing polarity?

kart24
Contributing Member
**********
********

Vacaville CA

Runs with scissors !!
Oct 10th, 2017 12:40 PM   Edit   Profile   Print Topic   Search Topic

I've ordered replacement Jensen C12N's for my newly acquired '65 Pro Reverb. It currently has '67 Altec Lansings Model 417B in it. Will I have to reverse the wires to retain the correct polarity? I know some JBL's are reverse polarity, not sure about the Altecs.

The tube chart is stamped AA165 Production #1 and "OG" stamped

(This message was last edited by kart24 at 02:59 PM, Oct 10th, 2017)

JBLTWIN1

usa

you want me to play where?
Oct 10th, 2017 01:20 PM   Edit   Profile   Print Topic   Search Topic

I don't know- I just check them before installation just to be sure.

Hammond101
Contributing Member
**********
*

So. Cal. USA

Oct 10th, 2017 01:35 PM   Edit   Profile   Print Topic   Search Topic

Altec is the same polarity as the Jensen. Black is - and white or red is +. The Pro Reverb should be the same as well as long as the speaker wire was properly wired.

In a an amp with two speakers, the main thing is that the speakers are wired in parallel and in phase. 180 out would make no real difference as long as the speakers are in phase with each other.

You can test speakers with a 9 volt battery, making a quick connection to see which was the cone moves.

kart24
Contributing Member
**********
********

Vacaville CA

Runs with scissors !!
Oct 10th, 2017 11:02 PM   Edit   Profile   Print Topic   Search Topic

Thx. I should get the speakers tomorrow.


Peegoo
Contributing Member
**********
**********
******

Enjoying

the downtime
Oct 13th, 2017 05:31 PM   Edit   Profile   Print Topic   Search Topic

When you tap the 9v battery against the speaker terminals, watch the speaker cone to see which way it jumps when energized.

If the cone jumps forward, the + battery terminal is on the + terminal of the speaker.

If the cone jumps rearward, the + battery terminal is on the - speaker terminal.

Easy peasy!

Testing a speaker like this is perfectly safe--so long as you don't hold the battery on the speaker terminals for more than a second. You can cook the voice coil if you keep it on there. DC current will fry a speaker in short order.

(This message was last edited by Peegoo at 07:34 PM, Oct 13th, 2017)

FDP Forum / Fender Amps: Vintage (before 1985) / Altec Lansing polarity?




Reply to this Topic
Display my email address             Lost your password?
Your Message:
Link Address (URL):
Link Title:




Moderators: Chris Greene  Iron Man  reverendrob  

FDP, LLC Privacy Policy: Your real name, username, and email
are held in confidence and not disclosed to any third parties, sold, or
used for anything other than FDP Forum registration unless you specifically authorize disclosure.

Furtkamp.com 
Internet Application Development

Copyright © 1999-2017 Fender Discussion Page, LLC   All Rights Reserved