[Test-Equipment] HP3335A Option

[Chris Trask]

I just acquired an HP 3335A to complete my vintage HP8409B network analyzer. It works fine, but there is a bit of a mystery as the option on the rear label says E01. I can find no reference to this anywhere. It does have the high stability reference, but that is usually option 001. Anyone know what option E01 is?

Chris

When the going gets weird, the weird turn pro
- Hunter S. Thompson