East UK designs come from a pro-audio approach, with the signal path treated as the highest priority.

Each EQ section is tailored carefully, with low noise and reduced interaction between bands. This makes the EQ feel more like a small mixer channel strip designed for bass rather than a simple tone circuit.

The result is a more focused and controlled response, with the trade-off of more complex circuitry.

A passive blend depends heavily on the impedance and characteristics of the pickups connected to it.

Some pickup combinations blend smoothly. Others interact with the passive blend pot in a way that makes the control feel closer to a three-position switch.

This is a known limitation of passive blending rather than a fault in the preamp. Active blend designs avoid this by buffering each pickup before blending.

The pots used in East UK preamps are sealed units.

If cleaner gets inside, it can remove the control damping and may not solve the real problem. In many cases, scratchy noise is caused by intermittent shaft grounding rather than dirt inside the pot.

Before using cleaner, check whether the noise disappears when you touch a grounded part of the bass.

The preamp does not create pickup interference by itself. It amplifies the signal present at its inputs, including both the wanted string signal and any unwanted noise already being picked up by the pickups.

Because the sound is more open and the EQ can boost certain ranges, existing noise may become more noticeable.

If noise is present, check pickup shielding, grounding and pickup type before assuming the preamp is faulty.

Single-coil pickups are naturally more prone to radiated hum and buzz than hum-cancelling designs.

A preamp may make the noise more apparent because it opens up the sound and can boost parts of the frequency range, but it does not create the pickup noise itself.

Shielding the pickup cavities and using proper grounding can help. Hum-cancelling pickups may reduce the issue further.

Yes, any regular hum-cancelling pickups will be fine.

East UK preamps use sealed pots, making it unlikely that dirt is the culprit. The crackling is usually caused by the inner and outer shafts of the stacked knobs momentarily losing contact during rotation. Cleaning the pots is not recommended as it can damage the sealing and potentially worsen the issue. 

• Scratchy pots: The pots used in East UK preamps are sealed, and cleaning them is not recommended. The pots are sealed, and if the cleaner gets in there, the stiction will be lost.  Scratchy pots are usually a sign of an electronic or electrical problem. 

• Loose or sloppy pots: The stacked pots used in East UK preamps, particularly those with pull switches, can feel loose or sloppy due to manufacturing clearances. This is a known issue, and replacement may not solve the problem. Consider returning the preamp for a refund if the slop is unacceptable. 

• Knobs turning each other: This usually indicates a bent middle shaft on the stacked pot, often caused by a knock to the upper knob. Carefully straightening the shaft might fix the issue. 

My stacked knobs are rubbing against each other. What can I do? 

This issue typically arises when the upper knob has been bumped, causing a slight bend in the middle shaft. You can try to carefully straighten the shaft yourself, but proceed with extreme caution as any sharp movement may break it. 

To straighten the shaft: 

• Remove the upper knob. 
• Inspect the lower knob shaft to ensure it is straight. 
• If the lower shaft is fine, remove the lower knob. 
• Identify where the middle shaft contacts the outer shaft (a magnifier may be helpful). 
• Using larger pliers, gently and firmly nudge the middle shaft away from the point of contact. Avoid any sudden movements. 
• If you are uncomfortable performing this adjustment, you can return the unit to East UK for a pot replacement.