Unusual HP21 Modfication?

[PANAMATIK]

(03-30-2016 09:05 PM)BobVA Wrote:  I think this is an early 21 board - it has a fantastic looking ceramic and gold ACT chip. All my other Woodstocks have plastic ACT packages. Perhaps the diode was an engineering change for some imagined problem they later decided wasn't an issue?

I also like the fantastic looking gold ACT chips, I have found one in my HP-27, but never saw one in an HP-21. Congratulations!

I didn't seriously want you to remove the modifications.

However I had to remove the ACT from my HP-27 for research, but it is still alive.

Bernhard