Finally working on 77-829 again

[edwardofhuncote]

Ahhh, that one! Fretless, with the unusual horns. I had never seen the headstock end before. Very cool bass.

[gtrguy]

I found a little time to start working on the main wiring today. This is my jig!

[pauldo]

 

[gtrguy]

Well, I am starting to install the electronics into the body today. I only work on it when it's raining and the weather up until today has been nice.
Will it all work? I won't know until I get more done!

[elwoodblue]

That's a whole lot of lams !!
Hopin' you got it right the first time, I have my fingers crossed.


Are there pics of #829 around? She looks special 

[gtrguy]

I fired it up today with a PF6 card from another series one (the card I will use had its pickup wires cut at some point and will need new connectors). The neck pickup works fine and sounds great. The bridge pickup setting at first was very quiet but worked and then squealed like a banshee and then stopped working at all. Switching the Q switch also seemed to have something to do with it. Next I will switch the PUP wires on the card and see what happens. However, the card came out of a bass that worked fine. I am very happy that I hear no hum or radio interference at all on the neck pickup setting!

[gtrguy]

Before installing the pickups I checked that they worked OK in another bass.

[edwin]

I fired it up today with a PF6 card from another series one (the card I will use had its pickup wires cut at some point and will need new connectors). The neck pickup works fine and sounds great. The bridge pickup setting at first was very quiet but worked and then squealed like a banshee and then stopped working at all. Switching the Q switch also seemed to have something to do with it. Next I will switch the PUP wires on the card and see what happens. However, the card came out of a bass that worked fine. I am very happy that I hear no hum or radio interference at all on the neck pickup setting!

Could be a pot. I've had the frequency pot do that in the past.

[gtrguy]

After exercising the pots 50 times the bridge pickup now works. However, if I twist the frequency pot a little, then the sound goes away or the squeal comes back. I'll try exercising it a couple hundred times more. I think my wiring job might be OK.

[gtrguy]

Well, my Fluke RMS VOM says all the pots have a similar sweep. Something else must be off.

[gtrguy]

Ah ha, I see where cap C1 (I think it's C1) is not connected to anything at all! I think I am getting close to the answer!

[gtrguy]

Great news: I soldered the cap back onto the lug and now she works!!! Best to carefully check whatever wiring you get for your project to see if it is all connected!

[rv_bass]

Does that connect to the Q switch?  I had one that squealed when I turned the filter all the way clockwise and it ended up having to do with the Q switch wiring.  Great that you figured it out for yours!

[elwoodblue]

Great news: I soldered the cap back onto the lug and now she works!!!

Woohoo!
 .. congrats.

[David Houck]

Good to hear you tracked it down!