User manual

brand and tube typewill change during production. You can fine-tune
your Einstein by havingdifferent type and brands of tubes installed,
however, it is imperative that the ampis biased properly. Einstein
utilizes 4 power tubes, organized in 2 pairs with dualbias possibility.
This allows use of 2 different pairs of power tubes, either thesame or
the different types. Yes, this means that in a 4- tube Einstein, you can
mix6550’s with EL34’s, or 6L6’s with KT88’s etc. Cool!
A quick and a general overview of the most common tube types for
the Einstein:
EL34/6CA7: aggressive, slender low end, higher total harmonic
distortion Recommended bias: 60-70mA (pair)
6550: very loud, very good dynamics, strong low end,
amazingly percussive. Recommended bias:
100mA (pair)
5.2.3 Life Span
Power tubes last 1 to 3 years, depending on care, volume and
frequency of use ofthe amplifier. If you use your amp only once a
month, then the tubes will lastmuch longer. Really. We have heard
tubes that are over 10 years old, but it wasnot a good thing. Tubes
age very slowly; slow enough for the artist to get used tothe
changing tone. To keep things fresh, and to keep your tube dealer in
business,we recommend re-tubing, cleaning and biasing once a year
if the amp is usedfrequently.