grunn tube preamp


Comes with

  • power cord (EU or US)
  • your preferred front panel wood species
  • your preferred brand of tubes (read below)
SKU: grunn Category:


The amplifiers are build to order. You’ll receive regular updates during the manufacturing process. This proces starts immediately after payment is fulfilled. Please contact me for actual delivery times.

Choose your wood
Choose between the bold, dark chocolate brown of Indian Rosewood, reminiscent of the fretboards on some of the most iconic bases ever made, or the more outspoken, exotic Ovankol, more of a rare beast among basses, yet found on the most exclusive instruments. Want to see your own wood featured on the front panel? Contact me and we’ll figure something out.

Choose your tubes
Different tubes have different sonic signatures. Although very subtle, they give you the opportunity to finetune your sound to taste. The vidur comes standard with Tung-Sol re-issue’s. The optional JJ Electronics perform marvelous as well.

  • Tung-Sol (re-issue): warm, big, open  and musical (default)
  • JJ Electronics: warm, more upfront, bit darker, solid tone

Both tubes are high quality, have very low microphonics and have been tested thoroughly. Prefer you’re own brand? Please contact me, so we can figure something out.

The wood used on these amps is actual indian rosewood and ovankol, which are natural products. Color and grain will vary between models.


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