Shashi process will give very good electrical isolation to the wood, and electrical components can be
mounted directly on the wood from the inside. It can be observed with tube amplifiers, having
wooden parts, those develop a crack after several years, or thick piano lacquer starts to crack, or chip
off. This is caused by the internal heat of tube amplifiers, and frustration can be very high if this
happens after some years. However with Shashi treated wood, this will never happen. Long term
stability of Shashi is excellent, and the extra costs are a good investment.
The feet of the amplifier are of Ebony wood, and are in line with the Yamamoto philosophy of using
Ebony stands for Audio Equipment. Some classical instruments like oboe, and the neck of a guitar
are made from Ebony as well.
The transformer cap is of brushed aluminium, cherry colour anodized.
Tubes supplied
The amplifier is supplied by Yamamoto with following tubes: 2x Type 45. 2x 717A 1x Type 80
rectifier. These are used tubes, but well tested by the Yamamoto company, care is taken that these are
also optically fine tubes.
Tubes replacement
Great care must be taken that the tubes for your A08-S are in good condition, since best sound can
only come this way. Saving money on tubes is the worst you can do, when good sound is what you
want. However buying triple selected tubes from obscure specialists is often a waist of money. So
buy good tubes from people that use good equipment, and make no secret about how they test tubes.
A non-documented tube test may be good, but a documented tube test may is more professional.
Here is some information on the particular tubes:
Tubes position
Believe it or not, but it is a classical mistake to put a rectifier in the 45 socket, or also put in a 45 or
the 80 rectifier with the pins in the wrong position. Do not orient the tubes position by the printing on
the tube! There is no relation. Always check the tubes pins first. The 717A, if it will not fit in, do
NOT
force it. Check if you have the guide pin at the right position.
Type 45 tubes.
We recommend you, not to use any Chinese 45. The recommended 45 tube from new
production is the Emission Labs 45 or 45 mesh. The mesh tubes may have best sound if you prefer the
high transparency that most horn speakers have, the solid plates are closer in sound to historical tubes.
However such audible differences are small.
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