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Old 23rd August 2011, 08:30 AM   #1
Freitsu is offline Freitsu  Finland
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Default Unknown tube, need help to identify!

Hello fellow enthusiasts! First post.

I've found a valve that seems to be in working condition (heater works) but all the info on it is long gone...

Maybe you can help me identify this beauty?
It has a B5 base.

Pic:

P8202540.jpg
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Old 23rd August 2011, 09:11 AM   #2
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Nice I said welcome already but didn't realize it was your second post so Welcome again

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Old 23rd August 2011, 09:15 AM   #3
Freitsu is offline Freitsu  Finland
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Sometimes I'm really quick!
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Old 23rd August 2011, 09:35 AM   #4
el156 is offline el156  Portugal
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Hi ! I have some QE06/50 that looks like that ! it is similar to the 807 ! and wellcome to the forum
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Old 23rd August 2011, 09:53 AM   #5
Freitsu is offline Freitsu  Finland
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Quote:
Originally Posted by el156 View Post
Hi ! I have some QE06/50 that looks like that ! it is similar to the 807 ! and wellcome to the forum
I tested the heater as QE06/50 and it should take 0.9A but this takes 1.08A. Pretty close...
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Old 23rd August 2011, 11:05 AM   #6
izozaya is offline izozaya  Poland
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The fact that you can see the heater glowing in full suggests that it is a directly heated type; that rules out the 807 and other IHT types.

I have seen that type of cylindrical wide mesh anode in some industrial diodes, but can't recall the types right now. Try to spot any grids in the inside, that will narrow the search significantly.
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Old 24th August 2011, 09:00 AM   #7
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AF2 AF2 from the 30s prewar and in nice condition but i cannot think its philips made

its a HF penthode/selectode

edit its suposed to glow at 4 volts instead of 6 . note the grid around the outer metal supports probably some sort of RF screening .
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Old 24th August 2011, 01:51 PM   #8
Freitsu is offline Freitsu  Finland
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Quote:
Originally Posted by v4lve lover View Post
AF2 AF2 from the 30s prewar and in nice condition but i cannot think its philips made

its a HF penthode/selectode

edit its suposed to glow at 4 volts instead of 6 . note the grid around the outer metal supports probably some sort of RF screening .
Thanks for identifying this piece of history!

It will add nicely to my small collection of tubes on the shelf.
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Old 24th August 2011, 03:08 PM   #9
el156 is offline el156  Portugal
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Hi Freitsu !
I have some CF3 and C/EM2 that i dont need ,if you want them to your collection i can send to you free !
Silvino
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Old 25th August 2011, 06:17 AM   #10
Freitsu is offline Freitsu  Finland
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Quote:
Originally Posted by el156 View Post
Hi Freitsu !
I have some CF3 and C/EM2 that i dont need ,if you want them to your collection i can send to you free !
Silvino
That'd be awesome, can't get enough of strange tube!

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