Bigguy2017

If it has FX send/return plug a patch cable and clean the jack sockets. As it's not affected by volume control its in the power amp section (probably). Try the usual - open it up, visual inspection, unplug/replug any connectors, look for anything iffy, swollen caps, and especially dull/dry joints. Have a good sniff - anything smell burnt. Then with the power on tap all areas of the boards and pots with a wooden chop stick and try and localise the fault. Most likely it's a dry solder joint but it could be a cap, transistor or chip... What amp is it?

Yes, generally you'll need a heavier string for shorter scale. I use D'Addario EXL160M (50-105) on my string-through Mustang and find them ideal. I also found the LaBellas too floppy.

Thomann for the HB ones G&W - notched straight edge (guitarsandwoods.com) they're in Portugal but do ship to UK I have the Crimson ones for guitar and bass but they don't appear to have bass ones... maybe give them a call avoid the eBay cheapies - they are not straight!

Yes, sounds like a bad solder joint - either in the pickup (at the thin coil wire connections) or in the control cavity. If you are really careful then unscrew the pickup, lift off the cover and have a good look at the solder joints - look for bad joints or a loose coil wire - the fix could be as easy as reflowing the solder. If it's the coil wire it's a bit of a fiddle - scrape of about 3mm of insulation and re-solder (this needs three hands!). If it's at the pot end it's a lot easier to re-solder. If you don't feel confident then take it to a good (?!) repair place - if available.

One of my favourite live recordings - Joni is really cooking' - the whole band is so together - great energy. Just wish Jaco would turn down a bit - is it just me or (heresy!) does Jaco turn everything into the Jaco P show?

Pah, that's nothing! I lived in an Ampeg 8 x 10 cab for two years before I could afford an 18" bass bin.

Something like this ? Nickel Plated Toggle Switch Guard | Car Builder - Kit & Classic Car Parts Specialist

Those aren't scratches - it looks like severe finish checking - cracks in the finish. The wood has shrunk a little and the finish has split. Options? Do you want it to look like a brand new instrument? If so then strip and refinish. On a vintage 1977 instrument like this I'd embrace the natural relic job... If the finish is lifting and detaching I'd drop fill with CA glue then sand back to flat and polish. Finish checking is cool on a 45 year old bass.

Prepare a cable with a 1/4" mono jack on one end and two croc clips on the other.... connect to amp. Unsolder pickup inputs at pots. Unsolder input to tone pot. Clip onto each pickup and check for signal / volume. Reconnect pickups to pots. Clip onto out lug of each volume pot and check for signal / volume. Reinstall tone pot, clip onto out lug and check it works. Finally clip across output jack and test.... Check earth continuity from output jack to pots and bridge. If AOK close it all up and test agin.

Leave the empty shell of a Neutrik XLR in the adjacent socket?

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The walnut plug says early 70s or modern - later 70s were bullet style. The Jazz Bass font is sans serif which was later 70s. Neck colour looks too new and the Fender decal also looks too new. Tuners look legit. Serial number is USA 77 - 78 or Japan 94 - 95 / 2006 - 2008 Bass could be later MIJ and mistakenly dated to 70s due to serial number ambiguity? Could also be a newer, replacement neck. Is there a neck date stamp? Pot date codes?

Yes, using Win11 + Edge browser I get this... Works AOK using Firefox. Looks like some kind of Certificate / SSL negotiation problem

More rugged Locking Proper cable clamping Handles higher power Can carry 2 signals (if 4 pole) Plugs are protected from short circuit, unlike jacks Takes thicker cables (some jacks do too) Solderless

Are the cables from Focusrite to BX5 monitors balanced - TRS jacks? If yes, then snip the earths off at the BX5 end.

Maine - that's a name from the past. I had a Maine 2 x 12" Stage combo as the top half of my bass rig, on top of 2 x 15" Vitavox W bins. Very heavy and very loud I recall.

I'd look at a Fender Player Precision (£699) and a Squier Classic Vibe '702 Precision (£349). Try and get some hands on playing time so pick a less busy period at a store with good stocks. A Precision will get all the sounds you want - don't think a single pickup makes them 'less versatile' it's not so. Try a few, one will be the best one 😉

D Addario EXL160M medium scale on string-through Mustang Perfect length...

Yes, if it has four screw terminals it's a 4 pole NL4 (and a knock off). You want a Neutrik NL2 type. https://cpc.farnell.com/neutrik/nl2fx/speakon-plug-2-pole/dp/AV24024

EXL160M D’Addario XL Nickel Medium guage 50 - 105 are really nice on a string through Mustang - as are the Fender jobbies.

That links me to a dodgy spam site... either there is no Cotswold Bass Guitars or their website has been hijacked

Also great for someone who reads a lot on holiday... ;-

First Aid Kit were good - and she had a nice collection of Mustang basses 😉

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Sounds like the output jack's ring contact might be not be making good contact. Give the jack a good clean and have a close look at the contacts with a jack inserted. Replace if suspect. PP3 battery clips are notoriously crap, made of chinesium, and it's hard to source a good one. (The RS Pro ones are OK RS PRO Press Stud 9V PP3 Battery Contact | RS Components (rs-online.com) It is possible to solder (quickly) the DC cables onto the battery terminals as a test. Also a piece of foam jammed in the battery compartment, pushing on the connector can help. Do as rmorris says...