Both models, 3.21SE and 3.21 signature, have received significant improvements.

The signature model now has two coolers
SE — one cooler.

Both models received a new top cover with a logo and holes on the sides. This greatly improves heat dissipation.

Both models also received a more powerful tube rectifier 5U4 that powers the current-voltage converter circuit.

Many more minor changes have been made to improve thermal stability and reliability.

Signature version:

SE Version:

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