Series 2 wiring issues Log Out | Topics | Search
Moderators | Register | Edit Profile

Alembic Club » Owning an Alembic » Troubleshooting » Series 2 wiring issues « Previous Next »

Author Message
kkustums
New
Username: kkustums

Post Number: 2
Registered: 7-2013
Posted on Wednesday, July 10, 2013 - 12:33 pm:   Edit Post

I haven't had this series 2 for long. It is a late 70's. The selector switch only works on one setting. I have a cable wired from stereo to mono so I can play it through any amp. Just wondering if the selector switch can go bad or if I have bad wiring?
jimmyj
Senior Member
Username: jimmyj

Post Number: 467
Registered: 8-2008
Posted on Wednesday, July 10, 2013 - 3:43 pm:   Edit Post

Kenneth, welcome to the forum. Your initiation is complete with the accidental double post. Ha!

We love this kind of puzzle, you've come to the right place. I'm not sure what year Alembic made the 1/4" jack mono but presuming yours is stereo: if you run a normal (mono) guitar cable from the instrument's 1/4" jack to the amp, what happens?

The pickup selector switch should have 4 positions:
1. Off
2. Bridge pickup only
3. Both pickups
4. Neck pickup only

And with a mono cable two of those positions should produce sound at the amp. It will only be the sound of one pickup and I think the neck pickup was "tip" (but I'm not sure). If it is the neck pickup, then positions 3 and 4 above should both work.

It is possible for that selector switch to fail but it's pretty rare.

Tell us more!

Jimmy J
kkustums
New
Username: kkustums

Post Number: 3
Registered: 7-2013
Posted on Friday, July 12, 2013 - 4:46 am:   Edit Post

Thanks for the double post death trip. I tried getting rid of it, but couldn't figure it out. oh well.


I have the stereo jack, a mono cable would only pickup one pickup in one position on the switch. When I made a cable to go from 1/4" stereo to 1/4" mono, all the pickups work in one position. The other 3 spots on the selector are dead.

Also, do I need the power supply to run the cool leds on the neck? I think I do and figured an oh well there since I don't have the power supply. The man I bought it from said he had that stuff years ago, but no clue now.
kkustums
New
Username: kkustums

Post Number: 4
Registered: 7-2013
Posted on Friday, July 12, 2013 - 5:26 am:   Edit Post

kkustums
New
Username: kkustums

Post Number: 5
Registered: 7-2013
Posted on Friday, July 12, 2013 - 5:28 am:   Edit Post

jimmyj
Senior Member
Username: jimmyj

Post Number: 468
Registered: 8-2008
Posted on Friday, July 12, 2013 - 10:33 am:   Edit Post

OK now your just teasing us. Please post a pic of the front of the instrument too so we can admire your acquisition!

You are correct, the LEDs won't run off battery power. In fact the preamp board itself draws quite a bit of current so I always considered the batteries a backup to the PSU... It's fun to have those LEDs too so you might want to save up for a DS-5.

The "flatpack" chips on your board and the coaxial pickup connectors make me think it's early 70's. But the small "Q" pots do make it a Series II. I didn't realize those two features overlapped, I thought by the time Series II started they were already using chips in sockets...

Anyway, here is an explanation of the controls (although your pickup selector switch may be in a different location):
http://alembic.com/club/messages/16271/41122.html?1182027166

Your audio problem is a mystery. But if your stereo to mono cable allows you to hear both pickups (individual pickup volumes change the balance?) that would indicate everything is working properly - except maybe that pickup selector switch. And at least you can play the instrument as it is. Out of curiosity, which switch position is the one that works?

By the way, did you include a couple summing resistors in your stereo to mono cable? (http://alembic.com/club/messages/16271/24370.html?1138068087) Preamp outputs don't like to be connected directly to each other.

And if you were so inclined, here is a description of how to make the internal 1/4" jack mono:
http://alembic.com/club/messages/16271/29811.html?1152754164

Others here should chime in with some ideas too. More pics please!!!

Jimmy J
kkustums
New
Username: kkustums

Post Number: 6
Registered: 7-2013
Posted on Friday, July 12, 2013 - 10:58 am:   Edit Post

Thankyou thankyou. The switch is 2 if you go counterclockwise. Its very odd. I have been playing this way for a while since it has both pickups playing an sounds great with both. I never worried. I am planning to sell it because i am mooving and thats why i want it perfect for the buyer. I will put the resistors in tonight on the cable and post a pic of the front later tonight.
cozmik_cowboy
Senior Member
Username: cozmik_cowboy

Post Number: 1527
Registered: 10-2006
Posted on Friday, July 12, 2013 - 2:07 pm:   Edit Post

I seem to recall Mica saying that they always made them with both switches & QVCs, but didn't formally designate them as Series I & II for a few years. And you're right, we do need lots more pix!!!
And Kenneth - I'll be happy to save you the trouble of moving it or selling it; reply to e-mail in my profile for shipping info :-)

Peter
kkustums
New
Username: kkustums

Post Number: 7
Registered: 7-2013
Posted on Friday, July 12, 2013 - 7:18 pm:   Edit Post





[pictures aligned vertically]

(Message edited by adriaan on July 15, 2013)
terryc
Senior Member
Username: terryc

Post Number: 2117
Registered: 11-2004
Posted on Monday, July 15, 2013 - 1:10 am:   Edit Post

Damn nice bass!!!!!!!!!!!!!!!!!!
hammer
Advanced Member
Username: hammer

Post Number: 375
Registered: 9-2009
Posted on Monday, July 15, 2013 - 7:17 am:   Edit Post

Beautiful bass! If this is the same Series II listed in TalkBass I'm surprised you haven't sold it yet.
hammer
Advanced Member
Username: hammer

Post Number: 376
Registered: 9-2009
Posted on Monday, July 15, 2013 - 7:17 am:   Edit Post

Beautiful bass! If this is the same Series II listed in TalkBass I'm surprised you haven't sold it yet.
kkustums
New
Username: kkustums

Post Number: 8
Registered: 7-2013
Posted on Monday, July 15, 2013 - 2:33 pm:   Edit Post

Yea. Same bass. I have had offers of other instruments. I need $$$ because of moving soon.
jimmyj
Senior Member
Username: jimmyj

Post Number: 470
Registered: 8-2008
Posted on Monday, July 15, 2013 - 4:10 pm:   Edit Post

Yes, very nice! That's not the original knob on the selector switch so it makes me wonder if it's the original switch?

Jimmy J
kkustums
New
Username: kkustums

Post Number: 9
Registered: 7-2013
Posted on Monday, July 15, 2013 - 5:52 pm:   Edit Post

The outer plastic came off the knob, it has the center metal piece of the knob there.

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Last Week | Tree View | Search | Help/Instructions | Program Credits Administration