I don't think they actually "blow". They just "burn out" when the internal gas is either lost or refuses to ionize anymore. So, probably "open" if not working.

Wayne

WB4OGM

-----Original Message-----
From: Mark K3MSB <mark.k3msb@gmail.com>
To: ARC5 <arc5@mailman.qth.net>
Sent: Tue, Oct 11, 2022 5:19 pm
Subject: [ARC5] SCR-274N RX NE-9 Bulbs

When these blow, do they blow open or short?

I'm referring to V1 and V2 on the receivers.

Mark K3MSB

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