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How long do valves last? And
how do I know when to replace valves?
Valve life will depend upon such things as hours of use
and number of on/off cycles. Valve life is impossible to
predict as they can suffer from many different faults. As
a very rough guide we would suggest valves are
routinely replaced according to this usage:
Up to 3 hours a day
3 hours a day or more
8 hours a day or more
Based upon using 5 out of 7 days a week.
All the valves in the MB30 wear at similar rate so
replacement in sets is recommended unless one fails
prematurely.
If you are uncertain about the condition of your valves
you may return them to Icon Audio for testing free of
charge. But like a LP stylus or car tyres valves have a
finite life and may not sound at their best when they have
several thousand hours of use.
It is our policy to offer service for any of our products
regardless of age. We are always happy to check the
valves and working of the amplifier for personal callers or
by post for a small charge. Please contact us first.
*See engineers notes at rear
Every 5 years
Every 3 years
Every year.
8 Specification & Features
100% Pure Class A output power
Class A, all Triode front end
KT120 60w beam pentode output valve
6SN7 (CV181) double triodes 1st stage valve
Valve rectifier, GZ34/5AR4
Output power Triode 16w (11.35v @8 Ohms)
Ultralinear 27w (14.7v @8 Ohm)
Oversized choke regulated power supply for both
driver and output stage
Our own unique designed tertiary wound output
transformer for low distortion and feedback
All hand wired point to point without printed circuit
Signal to noise level 98db (low gain)
Signal to noise level 88db (high gain)
Freq resp 18 - 26kHz +0 –1db (8w)
Freq resp 13 - 42kHz +0 –3db (8w)
THD 0.1% @1w. 0.4% @8w. 1.4% @27w
4 & 8 ohm loudspeaker taps (suitable for 2-16Ω)
Low feedback design (no feedback on high gain)
Solen/SCR hi fi audio capacitors (recommended
Jensen upgrade Copper foil upgrade available)
Audiophile
2
watt
performance, stability and reliability
Silver plated copper PTFE audio cable
Audiophile long grain, high flux steel transformer
laminations for high performance.
Gold plated Input & speaker terminals
330mv (high) & 925mv (low) input sensitivity.
220/240volts 85w approx (each)
C E, ROHS
Size in mm W160, D380, H210, 12kg ea
Packed 44cm x 25cm x 32cm 13kg 2 boxes
Typical values @ 235v AC (Specifications subject to change
metal
film
resistors
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