verb

Captain Lockheed and the Starfighters, based on the German airforce buying the Lockheed F104 and Lucky Leif and the Longships, based on the Vikings discovering America first, both by Robert Calvert.

Nice :-)
It may be a 150, as the 150s I've seen have the cups on the top like this one.

http://basschat.co.uk/topic/198-recommended-amp-techs/page__hl__amp%20repairs

Hi Joe,
Welcome to Basschat
Verb

Do I need another Trace head type bump

You can find your bass on the Warwick site under Pro Series discontinued models, along with the schematic I linked previously.If all the electrics, apart from the pickups, are Glockenklang, then the Warwick wiring isn't relevant to your bass.
Warwick usually wire their basses so that the signal comes from the pickups, through the balance pot, onto the PCB on the vol pot, here it is switched either to go through the vol pot to the jack socket(passive mode or more correctly EQ bypass mode) or to the active EQ then back to the vol pot then onto the jack socket.

I have read that Warwick do not recommend a small string to pickup clearance with their $$ pickups, due to the strong magnetic force
dampening string movement, I wonder if this is the case with your bass, might be worth dropping the pickups to check.
I have a passive Fortress One 4 string and the output on that was very poor, a common issue with that model, I fitted EMGs and an OBP3.

Having looked at a few pics of the Glockenklang preamp, I think they use an MEC stacked pot on their EQ board and that all the electrics in your bass are Glockenklang.
The original balance pot is 220K, so it might be worth checking the value on the blend pot.

Warwick diagram for your bass, not relevant with the current electrics but useful reference.
http://www.warwick.de/warwick/data/Warwick.de/Technical%20PDF/Scematic/PS-AS/AS_Bruce_60013.pdf

http://www.glockenklang.de/en/products/products_bass.htm

What is the writing? That will identify the value of the pot and it's taper.
I would assume it is a DPDT switch.

The Glockenlang site shows blend and vol with the preamp, if your Warwick uses their blend pot, is it the correct value for your pickups?
Are the jack connections correct? Pickup height ok?

Warwick used to use 2KHz and 100 Hz for their 2 band EQ frequencies.

I read a magazine a while back, possibly Bassist, with a Bronco renovation feature, and they used a guitar pickup with bar magnets.

Found this
http://www.talkbass.com/threads/need-rockfield-mm-pickup-wiring.620979/

How do you want to wire it?
series, parallel, to a switch?

PM sent

I use EXL 230 55-110 nickels, standard or drop tuned they're great.

Bought an amp from Martin, good comms, accurate discription, would happily buy from him again.

Fret at 1st and 12th with string just clearing the 8th fret for relief,
1.5-2.0 mm clearance on G string at 12th fret and 2.0-2.5 mm on E string.

Can you make some metal pins, possibly screws with the head cut off and a point filed in its place, to screw into the neck holes, then lower the neck into position to mark the neck pocket.
Then drill a pilot hole through from the pocket.

I purchased an amp from Paul, great communication, as discribed, dispatched quickly, very well packed.
I would deal with Paul again.

If it is just a 1/4 jack socket, it is probably to switch the preset and the graphic on and off.
There have been a few on eBay recently, they might be still available.

Here is the standard schematic, it may be of help.
I think the neck pickup C+D is a typo.

http://www.warwick.de/warwick/data/Warwick.de/Technical%20PDF/Scematic/Warwick/W_CorvetteDB_60014DB.pdf

Don't you want me baby?

Do you know the way to San Jose?

Is this the way to Amarillo?

Ever fallen in love with someone you shouldn't have fallen in love with?

Is it the beast under your bed,in your closet,in your head?

Why do birds suddenly appear every time you are near?

[quote name='inthedoghouse' timestamp='1438949193' post='2838895']
Lovely looking Fortress there, Verb :-)
[/quote]

Thanks :-) I will post some better pics one day

http://forum.warwick.de/showthread.php/4047-Warwick-Catalogs-and-Ads

This thread has an old review of the Masterman if you fancy a gander