12AX7A
- Maker
- Amperex
- Brand
- Hewlett Packard, Amperex

Manufacturer record
Hewlett Packard is a manufacturer or brand recorded in the TubeDatabase archive. The archive lists 4 tubes made or branded by Hewlett Packard. Tube numbers on file include 12AX7A, 5751, 12AU7, ECC82, GZ34, 5AR4, and F32.
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