Another unknown tube

rotaspec · 3rd September 2012, 03:55 AM

OK, so among a large collection of tubes i just bought was this one. The bottle size is the same as 6F6G, it has the same connections, but the plate structures are much bigger. It test very much like a 6L6G on my Avo tester, but all the 6L6G's I have seen are in a bigger bottle. The distance between the mica's is about 1.5" (38mm).
Test figures: Vp=Vs=250v, Vg=-16.5v, Ip=46mA, gm=4.2mA/v
Anybody know what it is?

Sorry for the awful pics that my old camera takes this close.

Thanks in advance, Gary

rotaspec · 3rd September 2012, 03:59 AM

Trying again with the pics

radiotron · 3rd September 2012, 07:15 AM

looks like a 6L6GA, same as 19W 6L6 or 6L6G, stuffed into a ST-14 bulb, your transconductance measurement would seem to agree with that

radiostar · 3rd September 2012, 10:22 AM

Size and shape is similar to National 6L6G, but National has slightly different top mica spacer. You need to take photo of top and getter.

3rd September 2012, 03:55 AM	#1
rotaspec diyAudio Member Join Date: Nov 2007	Another unknown tube OK, so among a large collection of tubes i just bought was this one. The bottle size is the same as 6F6G, it has the same connections, but the plate structures are much bigger. It test very much like a 6L6G on my Avo tester, but all the 6L6G's I have seen are in a bigger bottle. The distance between the mica's is about 1.5" (38mm). Test figures: Vp=Vs=250v, Vg=-16.5v, Ip=46mA, gm=4.2mA/v Anybody know what it is? Sorry for the awful pics that my old camera takes this close. Thanks in advance, Gary

3rd September 2012, 10:22 AM	#4
radiostar diyAudio Member Join Date: Apr 2009	Size and shape is similar to National 6L6G, but National has slightly different top mica spacer. You need to take photo of top and getter. __________________ tubes.rs facebook.com/tubes.rs

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3rd September 2012, 07:15 AM	#3
radiotron diyAudio Member Join Date: May 2007	looks like a 6L6GA, same as 19W 6L6 or 6L6G, stuffed into a ST-14 bulb, your transconductance measurement would seem to agree with that