Mystery valve - UK Vintage Radio Repair and Restoration Discussion Forum

kestrelmusic · 17th Feb 2020, 3:27 pm

Here's a valve with all the markings rubbed off.

It's a 5 pin base with a screw cap for the anode. Balloon shape with straight (i.e. no convex) sides. Parallel plate anodes.

4 volt indirectly heated, gives around 1 mA/V at 100V anode and screen, zero GB.

Pics attached (the reddish tinge is reflection from my pullover!). Can any kind and knowledgeable person identify this?

ms660 · 17th Feb 2020, 4:29 pm

AC/SG ?:

http://www.r-type.org/exhib/abh0113.htm

Lawrence.

PJL · 17th Feb 2020, 9:53 pm

Sometimes there are marks on the pinch that can help.

17th Feb 2020, 3:27 pm	#1
kestrelmusic Hexode Join Date: Feb 2008 Location: Wrexham, North Wales, UK. Posts: 465	Mystery valve Here's a valve with all the markings rubbed off. It's a 5 pin base with a screw cap for the anode. Balloon shape with straight (i.e. no convex) sides. Parallel plate anodes. 4 volt indirectly heated, gives around 1 mA/V at 100V anode and screen, zero GB. Pics attached (the reddish tinge is reflection from my pullover!). Can any kind and knowledgeable person identify this? Attached Thumbnails

17th Feb 2020, 4:29 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Mystery valve AC/SG ?: http://www.r-type.org/exhib/abh0113.htm Lawrence.

17th Feb 2020, 9:53 pm	#3
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Mystery valve Sometimes there are marks on the pinch that can help.