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Unknown metal-mazda valve

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Forum » Valves / tubes - Semiconductors » Very rare valves or unknown (not in RMorg) » Unknown metal-mazda valve
           
Nicolaas van Dijk
Nicolaas van Dijk
 
CR  Articles: 43
Schem.: 2
Pict.: 142
17.Jul.17 18:09

Count of Thanks: 5
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I have a valve, clearly an indirected heated triode with a 4 pin European base and two side contacts. The barnd says MetalMazda with a common M.

I can´t read the complete number, what I can read is BV?604.

Also stated at the ballon is 2.5 V and 150 V

The interior is a round anode and grid like the A415 with approx. the same dimension, but a indirected heated cathode

Anyone an idea?

Regards

Nico

 

Wolfgang Holtmann
Wolfgang Holtmann
Editor
NL  Articles: 921
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17.Jul.17 23:18

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Hello

I think the correct type is BW604.
It is indeed an indirectly heated triode for AC supply via the side contacts.

This was done to replace the old directly heated triodes (by a storage battery) in a wireless set.
You have simply to add a transformer fed from the mains.

Kind regards.

Nicolaas van Dijk
Nicolaas van Dijk
 
CR  Articles: 43
Schem.: 2
Pict.: 142
17.Jul.17 23:40

Count of Thanks: 5
Reply  |  You aren't logged in. (Guest)   3

So the question mark is the other half of the W!!

Thanks a lot for the info Wolfgang, highly appreciated. I will mark the tube as such

I saw it is from 1928, nice

Kind regards

Nico

 

  
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