02-22-2015, 05:36 PM (This post was last modified: 02-22-2015, 06:33 PM by cthendrico.)
PLEASE HELP! So in my gv22 I replaced the factory speakers with 2 altec lansing 417-8c's that are 8 olm. I started looking at the wiring and got confused and am afraid that the amp had been incorrectly wired. The schematic says that gv22 should have two 8 olm speakers wired in series for a 16 olm load.
My question is that the speaker wires hardwired to the amp are green and black. Which one is positive and which one is negative?????
also if I wanted to change the hardwire setup to a mono phone socket speaker out, which wire color (green or black) to the tip and sleeve terminals of the jack respectively? p.s. i still want to use the external speaker jack.
Check which wire connects directly to the feedback resistor.
In the schem you linked to, it says black it ground, but it doesn't seem to indicate it on the photo of your amp's schematic.
(02-22-2015, 05:36 PM)cthendrico Wrote: PLEASE HELP! So in my gv22 I replaced the factory speakers with 2 altec[b] lansing 417-8c's that are 8 olm. I started looking at the wiring and got confused and am afraid that the amp had been incorrectly wired. The schematic says that gv22 should have two 8 olm speakers wired in series for a 16 olm load.
My question is that the speaker wires hardwired to the amp are green and black. Which one is positive and which one is negative?????
also if I wanted to change the hardwire setup to a mono phone socket speaker out, which wire color (green or black) to the tip and sleeve terminals of the jack respectively? p.s. i still want to use the external speaker jack.
When I looked last night it looked like both Green and black wires came up the chassis by the transformer and the connected to the external speaker Jack. It looked like the Green was soldered to the tip lug. Does that help? I don't know where the feedback resistor is or how to find it
It's funny, but I had this same question last night. My problem was that my green and black wires were so stained with what I think is nicotine, it is hard to tell which wire was which. Had to get a flashlight and closely examine it to see any green!
I just hooked up two Eminence GB12's in mine. Did it late at night after everyone was in bed, so I haven't had a chance to hear what it sounds like. I'm sure the Altecs are awesome
02-27-2015, 07:15 AM (This post was last modified: 02-27-2015, 07:17 AM by cthendrico.)
(02-24-2015, 10:26 PM)Hangman Wrote: Green is positive, black is ground, at least thats what the schematic says.
Well my wiring was all screwed up then. So let me try to get some clarification. If I wanted to install a new speaker Jack to the chassis. I would just need to run Green to the tip and black to the sleeve and that would allow me to use a 16 ohm Cab out of my new Jack and another 16 ohm Cab out of the existing extension speaker Jack?
(02-27-2015, 07:15 AM)cthendrico Wrote:
(02-24-2015, 10:26 PM)Hangman Wrote: Green is positive, black is ground, at least thats what the schematic says.
Well my wiring was all screwed up then. So let me try to get some clarification. If I wanted to install a new speaker Jack to the chassis. I would just need to run Green to the tip and black to the sleeve and that would allow me to use a 16 ohm Cab out of my new Jack and another 16 ohm Cab out of the existing extension speaker Jack?
Also were you looking at the free info society link or the picture of the factory schematic glued to my chassis I posted?
Ok so I have a confession. I have spent the last 2 weekends building a head box for this gv22. I'm doing it because I have a miserably bad back and the combo with altec speakers was killing me. I built the box a little taller to facilitate the reverb unit on the bottom of the head box. I didn't want to say anything because people might chastise me for changing a vintage unit. (see below for picture)
THE ONLY thing I have left is wiring it to accept a speaker cab and not be hardwired to the speakers. What I was hoping to do is drill a 1/4 hole in the chassis and install a mono socket and take the green wire and solder it to the tip terminal and the black wire to the sleeve terminal.
I am LITERALLY sitting here with a drill bit in my hand waiting to see if based on the schematics above this will work to give me the ability to plug a 16 Colm speaker cab into my new jack and still be able to use the auxiliary cab jack as well. I don't want to drill unless it will work. PLEASE HELP!
The way it is hooked up from the factory, there should be three wires. green is 16ohm positive, black is ground, and then there should be another wire it might be yellow, but hard to say.
regardless, from the factory, the ext speaker jack is hooked up so that all of the wires from the transformer connect to it. The jack has two shorting connections, a shorting connection for when nothing is plugged into it (that is where the green wire originally went) and shorting connection that gets engaged when there IS a plug inserted into the ext speaker jack. (The 8 ohm tap whatever color that is goes there)
The internal combo speaker positive wire connects to the tip terminal on the ext speaker jack.
SO what you need is a shorting 1/4 inch jack
if I understand you correctly You want to maintain the original fucntion of the jack. So leave everything stock, and just connect the tip and ground terminals of the extension speaker jack, to the tip and ground of a new "main speaker" jack. then do as fender did, and connect the shorting connection to ground, so that if nothing is plugged in, your output is shorted, and if someone were to try and play without a cab plugged in, it would blow a fuse (hopefully before it blew your tubes and output transformer).
take a picture of your speaker jack, and I can tell you if it is still wired correctly.
Ok so what I did last night was feed the writes that were connected to the speakers (Green and black) and feed them back up through the chassis. The green wire was connected to the extension speaker Jack tip. I left one side of the Green to extension speaker tip and I connected the other end to the new Jack tip. The black was connected to the transformer. I left one side of the black connected to the transformer and I fed the other end up through the chassis and attached it to the new Jack sleeve. Does this sound right? I plugged a 16 ohm and everything worked and sounded fine. I am actually out of town so I can't take pictures.
In a somewhat related question it appears that the extension speaker Jack had some isolating rubber around it to isolate it from the chassis. Is that imperative?
