FIXED 😀
Thanks for your help guys. It was just the bridge after all.
When I got the bass new a couple of months ago, I noticed that the floating bridge was set at an angle, so I was very careful when I removed the foam transport pad to position it in the same place again; but it was obviously set wrong at the factory, hence the pitch problem that I only noticed when I started playing bass lines higher up the neck.
I corrected the problem by getting the G string in pitch first, then the E string, and finally the A and D strings. After a bit of wiggling about I finally got the bridge lined up straight with the pickup and in tune across all strings (with just +/- 7 cents between them). Happy days.
Hofner Violin Bass - Intonation
Tools
• Guitar/bass tuner
• Snipe-nose pliers
• Tape measure
1. Measure and Slide
• Measure the distance from the fretboard side of the nut to the middle of the 12th fret
• Measure the distance from the middle of the 12th fret to the middle of the bridge saddle insert under the G string
• These distances should be the same; if not, loosen the strings and gently slide the bridge to the correct distance
2. Tune
• Tune each string to standard pitch.
3. Adjust Height
• Adjust the string height (action) as desired for comfortable playing by turning the knurled thumbwheels on each side of the bridge carefully with the pliers
• The height should be set so the strings do not buzz or rattle when playing in low or high positions on the fretboard
4. Intonate
• Lightly touch the G string at the 12th fret and pluck with the pick to sound the harmonic tone. It should indicate correct pitch; if not, continue sounding the harmonic tone while tuning the string until it’s tuned to the correct pitch
• Fret the G string firmly at the 12th fret:
o if the fretted note shows sharp (higher) on the tuner, loosen the strings and slide the bridge back about 3 mm
o If the fretted note shows flat (lower) on the tuner, loosen the strings and slide the bridge towards the neck about 3 mm
o Retune the strings and repeat the above steps until the fretted note is at the correct pitch
• Repeat the above steps on the E string to set the other side of the bridge for proper intonation
• All the strings should now be intonated
It does have a bit more relief in the neck than my other bass guitar, but I can live with that as I've lowered the action and filed down a single sharp fret that was causing fret buzz. It's very playable, even at the dusty end now.
Thanks again.