Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dude on September 21, 2019, 12:20:54 pm

Title: Identifying spk polarity
Post by: dude on September 21, 2019, 12:20:54 pm

Some speakers don’t have polarity marked, using just one spk, l believe it makes no difference but more than one it does. How  does one identify unmarked, +|- .

Title: Re: Identifying spk polarity
Post by: sluckey on September 21, 2019, 12:35:53 pm

Gator clip leads and a battery. May need a 9v battery for big speakers. Briefly connect the battery to the speaker. Touch, off, touch, off. If the cone moves out, mark the speaker terminal that has the positive battery lead attached as the positive terminal. Repeat for other speakers.

Title: Re: Identifying spk polarity
Post by: dude on September 21, 2019, 12:42:51 pm

Thank you, now l remember that trick, getting old, l’d forget my head if it wasn’t attached to my shoulders,  :icon_biggrin: