Ampeg V-4B 2x15 Horn Cab Ohms Switch Diagram?

someparts · #1 09-26-2011, 01:36 PM

Okay, doing a little resto work on a 70s Ampeg V-4B cab....the big folded horn 2x15. It has an 8-lug slide switch for 4 or 16 ohms series/parallel on the jackplate but it was bypassed when I got the cab....so anyone know how to wire the switch so I can get that function back? I could just leave it bypassed at 4 ohms but really wanted to hear what my B-25B head could do with an efficient cab, and it only does 16 and 8 ohm.

coreyfyfe · #2 09-26-2011, 01:52 PM

I didn't realize the V4 cabs came with the 4/16 switch like the B25 cabs?

Anyhow, if it's a 8 lug like the B25 cab you'll want to replicate this wiring pattern:

If you do a google site search (type "site:www.talkbass.com" after your search terms) you can look for the B25 cab schematic, it's been posted on here a few times, and that would give you the proper wiring diagram, but I found this to be a bit clearer as most of the wiring diagrams I've seen online had different lug layouts.

will33 · #3 09-26-2011, 02:05 PM

Quote:

Originally Posted by coreyfyfe

I didn't realize the V4 cabs came with the 4/16 switch like the B25 cabs?

Anyhow, if it's a 8 lug like the B25 cab you'll want to replicate this wiring pattern:

If you do a google site search (type "site:www.talkbass.com" after your search terms) you can look for the B25 cab schematic, it's been posted on here a few times, and that would give you the proper wiring diagram, but I found this to be a bit clearer as most of the wiring diagrams I've seen online had different lug layouts.

So how does the finger fit into all this?

coreyfyfe · #4 09-26-2011, 04:30 PM

Doesn't. That's batting.

BassmanPaul · #5 09-26-2011, 05:10 PM

Don't give the batting the finger! That's just being rude!!

someparts · #6 09-26-2011, 05:58 PM

Okay, thanks for the pics....that helps alot. I see the jumper and I take it each speaker has a hot and ground run to the switch for the series/parallel.....but what goes to the jack?

coreyfyfe · #7 09-26-2011, 06:16 PM

If you look at the images you can see where they go. The top green (+) wire is split and goes from the jack to the first speaker and the top right lug. The black/grey (-) lead connected to the jack is split connecting to the first speaker and the rightmost lug on the bottom row. The lug on the of the bottom row (green lead) connects to the second speaker (+) terminal, and the middle lug (black lead) is connected to the (-) terminal of the second speaker.

I think that's how it went.