icon Audio
Instruction Manual for:
MB 30m Amplifiers
Shown with upgraded driver valves
Contents
1 Introduction & final inspection
2 Quick set up guide
3 Connecting inputs & outputs
4 Getting the best performance
5 Trouble shooting
6 Bias adjustment
7 Valve replacement
8 Specifications
9 Guarantee
10 Packing instructions
1 Introduction
Thank you for purchasing the
MB30m
.
Designed by David Shaw in Leicester. These pure
valve mono block amplifiers are the result of years
of careful design and listening tests with a wide
range of speakers. The amplifiers are hand built
using carefully selected audiophile components. The
transformers are our own unique LDT Tertiary hand
wound design hand wound using low oxygen copper
and special Japanese long grain iron. Each amplifier
is completed in Leicester, then valved, carefully
commissioned and tweaked for best performance.
In order to get the best out of your amplifier, please
read the “SET UP” notes. These contain important
information about the correct operation and safety.
Should you be uncertain about anything please
contact your dealer or one of our team.
Valve amplifiers do need a little more attention than
their solid-state counterparts, but the sonic results
are well worth it. In this manual we have tried to
include everything that you need to know. Please let
us know if you find any errors or feel that we have
missed anything out.
The
MB30m
is a Single Ended (one output
valve) triode/UL power amplifier designed for the
excellent new KT120 power output valves. Many SE
amplifiers are of low power which limits the choice of
speaker. The new KT120 valve has enabled us to
develop an amplifier which has three times the
power of a single 300B, The MB30 will give ample
volume with most popular loudspeakers in most
situations, with a smoothness and richness that is
often lacking with push-pull designs.
MB30s operate in “fixed-bias” mode which gives
maximum power, cooler running and low distortion.
The MB30s are sensitive enough to be used with
any pre-amplifier or passive in most situations. Their
simplicity coupled with point to point hand wiring
without the use of printed circuit boards results in an
open euphoric sound that is wonderfully detailed
and warm. You MUST occasionally check the bias
this is easy with the built in meter.
