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OTL, Output Transformerless Amplifier User Group.

The comment on Tubecad

was not entirely accurate if it was quoted correctly. There's a pretty big difference between four and eight ohms let alone sixteen!

As a generalization there are problems! A lot depends on the individual OTL. It would be a pretty low power OTL to put out more power into 72 ohms as opposed to 16 for example.

Our smallest amp is the S-30 which makes its highest power into about 25 ohms 50 watts) and it's actually less power into 72 ohms! So the comment doesn't really apply to our amps.

Generally speaking our smaller amps, the S-30 and M-60, are both quite happy on 16 ohms and both do well on eight ohms too. Even with a custom speaker I can't imagine why you would want to go over 32 ohms.

Our larger amps are fine with four and eight ohms; the biggest puts out its maximum power into three ohms (over 500 watts and as far as we know is the most powerful OTL made).

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