Roscoe/Glockenklang 3 Band 4 Knob Wiring Diagram

CrashClint · #1 09-30-2008, 09:49 AM

A few people have asked about chaning over a Roscoe with the Bart preamp to a Glockenklang preamp. First, the Bartolini is wired for 18 volts and the Glock is wired for 9 volts. You can still use both batteries with the Glock, but you will have to rewire the batteries and solder both Black wires together and you will solder both Red wires together. This will put the batteries in Parallel and only produce 9 volts.

The wiring diagram that comes from Glock shows it as a 5 knob preamp, but the actual Roscoe/Glock preamp is a 4 knob. The Bass and Treble are stacked. I am attaching the factory Glock Wiring Diagram that I have updated to be used with a Roscoe. I hope this helps.

JOME77 · #2 09-30-2008, 11:00 AM

Clint,
Very cool! Good info to have.

bongomania · #3 09-30-2008, 11:14 AM

I notice that you have marked that the sleeve/ground of the output jack should not be grounded to the cavity. I didn't realize that, and I'm wondering what the reason is? (Not doubting at all, just trying to learn exactly how it works).

jzbass6 · #4 09-30-2008, 12:06 PM

Clint, thanks for posting the edited diagram, it saved me time and money and I appreciate it.
Will

CrashClint · #5 09-30-2008, 01:00 PM

Quote:

Originally Posted by bongomania

I notice that you have marked that the sleeve/ground of the output jack should not be grounded to the cavity. I didn't realize that, and I'm wondering what the reason is? (Not doubting at all, just trying to learn exactly how it works).

It had something to do with ground noise, I will have to check and see if I still have the email.

I wired mine per the diagram and it is quiet.

bongomania · #6 09-30-2008, 03:30 PM

Yeah, I was surprised by the amount of noise I was getting with this pre, and I "knew" it had to be a grounding issue but I haven't had the time to troubleshoot.

CrashClint · #7 09-30-2008, 03:46 PM

Make sure your pickup ground leads and shielding do not go to cavity ground.

I know with the Audere, they wire theirs with the same principal, keeping the pickup leads isolated from the cavity ground to reduce noise.

JOME77 · #8 09-30-2008, 08:32 PM

Quote:

Originally Posted by bongomania

Yeah, I was surprised by the amount of noise I was getting with this pre, and I "knew" it had to be a grounding issue but I haven't had the time to troubleshoot.

It utilizes an isolated ground for the preamp (not common with earth ground;similar to what is referred to as a floating ground in the car stereo world)

bongomania · #9 10-03-2008, 01:59 AM

Yeah, I've used floating ground gear before. Sometimes it's great, sometimes it's incompatible with other grounding systems in other gear. I sold off my favorite preamp ever just because the floating ground made it unpredictable in terms of what other gear I could use.

Back onto the Glock situation, I've hit a point where I'm stumped, and hoping somebody has an idea.

Turns out there was continuity between the jack sleeve and the cavity, as suspected. I managed to isolate it- by desoldering the cavity ground wire from the preamp module! All the hiss I was getting went away 100%, but it was replaced by that obnoxious "bad ground" honk/hum noise.

The sleeve of the jack has continuity with the pad on the preamp module where the cavity ground wire connects.

With that wire disconnected, the copper-shielded cavity has continuity with the bridge and the copper-shielded pickup cavities. The jack sleeve has continuity with that one wire, plus a few other points on the preamp modules, and the exposed poles of the pickups.

The pickups are Fender SCN's, and I have verified that the black wires are the common and the yellow/white wires are the signal from those.

Also, the passive tone knob function does not work at all. I don't know if it's related in any way, but the treble pot works perfectly when active and does nothing when passive. I mention it not only because maybe somebody has an idea how to troubleshoot that, but also because I imagine it could be a grounding issue there as well.

Any ideas guys?

bongomania · #10 10-03-2008, 03:01 AM

I just did some more troubleshooting. The cavity ground connects to the bass/treb preamp module. There is a grey wire going from the bass/treb module to the volume module. The jack sleeve connects to a pad on the vol. module. There is continuity all along that route. Since there is not supposed to be shared continuity there, and since I have verified that the continuity is not along any other path such as shielding, then there must be some point on either the bass/treb module or the vol. module where the connection is supposed to be broken, but isn't. There is a visible trace connecting the pad of the cavity ground with the grey wire leading to the vol. module, so I'm thinking there is supposed to be continuity there. That leaves the vol. module. I don't see any stray wires or solder bridges. There is continuity at a great many points around that module, and it is difficult to tell where the two grounds are not supposed to connect.

Hmmm....

bongomania · #11 10-06-2008, 10:21 AM

Any ideas guys? I know I should ask the manufacturer- any idea who is the best person there to email?

Shiveringbass · #12 10-07-2008, 03:32 AM

Hey Bongomania,

You should try to send a mail directly to Glockenklang :
info@glockenklang.de

Usualy, Udo Klempt (Glock owner and ingenior) answers mail directly.

Good luck

Ludo

CrashClint · #13 10-07-2008, 08:16 AM

Quote:

Originally Posted by Shiveringbass

Hey Bongomania,

You should try to send a mail directly to Glockenklang :
info@glockenklang.de

Usualy, Udo Klempt (Glock owner and ingenior) answers mail directly.

Good luck

Ludo

Great information Ludo! Thanks for posting the contact info for Glock Germany, I don't know why I didn't think to post it!

Shiveringbass · #14 10-07-2008, 12:09 PM

Hope it will help.

My rare problems with Glock gear had always been solved by a mail sent to Udo.

Clint, have you received my last PM from last week about Delano pickups ?

CrashClint · #15 10-07-2008, 01:07 PM

Quote:

Originally Posted by Shiveringbass

Hope it will help.

My rare problems with Glock gear had always been solved by a mail sent to Udo.

Clint, have you received my last PM from last week about Delano pickups ?

Hey Ludo, some how I missed your pm and went back and read it. I like the Delano, very open sounding pickup, a little more open sounding then the Classics, the classics seem to have that low mid bump. I would put them closer to sounding like Nords with a more modern sound.

I am digging your MySpace page, sounds great!

bongomania · #16 10-07-2008, 03:43 PM

Quote:

Originally Posted by Shiveringbass

You should try to send a mail directly to Glockenklang :
info@glockenklang.de
Usualy, Udo Klempt (Glock owner and ingenior) answers mail directly.

Thanks very much!

jzbass6 · #17 10-16-2008, 11:37 AM

Hey Guys, I finally got my Glock pre installed, but it only seems to work in the passive mode: which sounds great with the Norstrand DC's.
I believe I wired it properly using Crash’s modified diagram (thanks again). I didn’t totally rewire the output jack, connecting the gray neg jack lead to the blk neg 9V battery lead and the wht lead of the Volume module to the wht output jack lead and blk lead of the Volume module to the blk output jack lead. Does anyone have any idea what the problem might be? I don't want to take the chance of blowing something up.
Thanks, Will