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The tube GM70
Graphite anode
Copper anode
For a high-power single-ended triode amplifier, the selection of suitable power tubes is limited. We have chosen the directly heated GM70 for several reasons:
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-There is a good supply of new tubes from old stocks (NOS).
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-It is very well built and has consistent quality.
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-It has good longevity.
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-It is a linear tube with very high sound quality.
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-It leaves a high output.
According to the data sheet, the graphite version of the GM70 handles a power of 125 watts anode dissipation.
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The copper version of the GM70, according to the general opinion, is slightly less tolerant, which is why we have chosen to set the anode dissipation to 90 watts.
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Before clipping, the amplifier delivers 25 watts at 8 ohm load.
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