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Old 11th Feb 2019, 9:35 am   #18
FrankB
Heptode
 
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 663
Default Re: Looking to build RF detector probe for low frequency

I have seen older RF probes using the following tubes: 6AL5, 955, 956,( Yes those are both triodes) 5642, and another "pencil" tube whose number I can't remember off the top of my head.
IIRC, Philco may have made one using a Loctal tube too.
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