please delete

[Alex R]

sorry, answered my own question. Please delete thread if I don't manage to!

[Jazz P Bass]

Interesting amplifier design!

[Alex R]

Oh sorry not to respond. This is a revision of the Williamson design. I was building a couple for a client, he supplied some lethal 50s DIY monoblocs with huge transformers on aluminium chassis. Had to talk him out of retaining the leaking period paper-in-oil metal box caps. Of course the chassis were bent where the parcels had been dropped. Not everyone understands momentum, or is it inertia I forget, anyhoo it bends chassis. Built them on nice small neat steel Hammonds using the original iron. They came out ok.

[Leo_Gnardo]

Not everyone understands momentum, or is it inertia I forget,

One and the same, word used may depend on frame of reference.

[Helmholtz]

One and the same, word used may depend on frame of reference.

Not the same.

The terms are well defined in physics:

Inertia equals mass (m).

Momentum (p) equals mass times velocity (v), so p = m*v.

Deformation is caused by the impulse, which is the difference between initial momentum and final momentum (often zero).