This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
Bill

:This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
:Bill
:
:

It might be an electron relay.

::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
::Bill
::
::
:
:
:It might be an electron relay.

I think the E. R. is for Eveready Raytheon.
Bill

:::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
:::Bill
:::
:::
::
::
::It might be an electron relay.
:
:I think the E. R. is for Eveready Raytheon.
:Bill

That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.

::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
::::Bill
::::
::::
:::
:::
:::It might be an electron relay.
::
::I think the E. R. is for Eveready Raytheon.
::Bill
:
:That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.

It has to be somewhere in between the DeForest Audion and 01a.

Bill

Can you see a grid in this tube? If not it might be an early rectifier?

I'll send this to Tube Collectors Association. Jim Cross or Lud Sibley might know?

Norm

:::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
:::::Bill
:::::
:::::
::::
::::
::::It might be an electron relay.
:::
:::I think the E. R. is for Eveready Raytheon.
:::Bill
::
::That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.
:
:It has to be somewhere in between the DeForest Audion and 01a.

Norm, It's a Moorhead Electron Relay tube. I was reading about reactivating old tubes in "Everyman's Guide to Radio" 1927, and stumbled upon a picture. Guess that's what Johnnysan was indicating. The web has sites with pictures and data about Moorhead I need to read yet. But a detector? Thanks to all for the help. Any other specifics appreciated.
Bill

:Bill
:
: Can you see a grid in this tube? If not it might be an early rectifier?
:
: I'll send this to Tube Collectors Association. Jim Cross or Lud Sibley might know?
:
:Norm
:
::::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
::::::Bill
::::::
::::::
:::::
:::::
:::::It might be an electron relay.
::::
::::I think the E. R. is for Eveready Raytheon.
::::Bill
:::
:::That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.
::
::It has to be somewhere in between the DeForest Audion and 01a.

I got it now. It's a gas detector. Moorhead ER tall plate with mica spacer, 7,000 made. Filament volts 4, current .70, and plate 20-40 volts.Information from this site:

http://www.bill01a.com/articles/moorhead.htm#_edn39

:Norm, It's a Moorhead Electron Relay tube. I was reading about reactivating old tubes in "Everyman's Guide to Radio" 1927, and stumbled upon a picture. Guess that's what Johnnysan was indicating. The web has sites with pictures and data about Moorhead I need to read yet. But a detector? Thanks to all for the help. Any other specifics appreciated.
:Bill
:
::Bill
::
:: Can you see a grid in this tube? If not it might be an early rectifier?
::
:: I'll send this to Tube Collectors Association. Jim Cross or Lud Sibley might know?
::
::Norm
::
:::::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
:::::::Bill
:::::::
:::::::
::::::
::::::
::::::It might be an electron relay.
:::::
:::::I think the E. R. is for Eveready Raytheon.
:::::Bill
::::
::::That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.
:::
:::It has to be somewhere in between the DeForest Audion and 01a.

Bill

Heard back from Lud. Tube was made around 1920 in San Francisco. The 6 digit number is the serial. The S probably indicates Shaw base. Lud called it an "electron relay".

I would have forwarded the email but your address isn't shown.

Norm

:

I got it now. It's a gas detector. Moorhead ER tall plate with mica spacer, 7,000 made. Filament volts 4, current .70, and plate 20-40 volts.Information from this site:
:
:http://www.bill01a.com/articles/moorhead.htm#_edn39
:
:
::Norm, It's a Moorhead Electron Relay tube. I was reading about reactivating old tubes in "Everyman's Guide to Radio" 1927, and stumbled upon a picture. Guess that's what Johnnysan was indicating. The web has sites with pictures and data about Moorhead I need to read yet. But a detector? Thanks to all for the help. Any other specifics appreciated.
::Bill
::
:::Bill
:::
::: Can you see a grid in this tube? If not it might be an early rectifier?
:::
::: I'll send this to Tube Collectors Association. Jim Cross or Lud Sibley might know?
:::
:::Norm
:::
::::::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
::::::::Bill
::::::::
::::::::
:::::::
:::::::
:::::::It might be an electron relay.
::::::
::::::I think the E. R. is for Eveready Raytheon.
::::::Bill
:::::
:::::That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.
::::
::::It has to be somewhere in between the DeForest Audion and 01a.

Thanks Norm. I put my email address up.
Bill

:Bill
:
: Heard back from Lud. Tube was made around 1920 in San Francisco. The 6 digit number is the serial. The S probably indicates Shaw base. Lud called it an "electron relay".
:
: I would have forwarded the email but your address isn't shown.
:
:Norm
:
::
:
:I got it now. It's a gas detector. Moorhead ER tall plate with mica spacer, 7,000 made. Filament volts 4, current .70, and plate 20-40 volts.Information from this site:
::
::http://www.bill01a.com/articles/moorhead.htm#_edn39
::
::
:::Norm, It's a Moorhead Electron Relay tube. I was reading about reactivating old tubes in "Everyman's Guide to Radio" 1927, and stumbled upon a picture. Guess that's what Johnnysan was indicating. The web has sites with pictures and data about Moorhead I need to read yet. But a detector? Thanks to all for the help. Any other specifics appreciated.
:::Bill
:::
::::Bill
::::
:::: Can you see a grid in this tube? If not it might be an early rectifier?
::::
:::: I'll send this to Tube Collectors Association. Jim Cross or Lud Sibley might know?
::::
::::Norm
::::
:::::::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
:::::::::Bill
:::::::::
:::::::::
::::::::
::::::::
::::::::It might be an electron relay.
:::::::
:::::::I think the E. R. is for Eveready Raytheon.
:::::::Bill
::::::
::::::That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.
:::::
:::::It has to be somewhere in between the DeForest Audion and 01a.

Bill

Email forwarded.

Norm

:Thanks Norm. I put my email address up.
:Bill
:
::Bill
::
:: Heard back from Lud. Tube was made around 1920 in San Francisco. The 6 digit number is the serial. The S probably indicates Shaw base. Lud called it an "electron relay".
::
:: I would have forwarded the email but your address isn't shown.
::
::Norm
::
:::
::
::I got it now. It's a gas detector. Moorhead ER tall plate with mica spacer, 7,000 made. Filament volts 4, current .70, and plate 20-40 volts.Information from this site:
:::
:::http://www.bill01a.com/articles/moorhead.htm#_edn39
:::
:::
::::Norm, It's a Moorhead Electron Relay tube. I was reading about reactivating old tubes in "Everyman's Guide to Radio" 1927, and stumbled upon a picture. Guess that's what Johnnysan was indicating. The web has sites with pictures and data about Moorhead I need to read yet. But a detector? Thanks to all for the help. Any other specifics appreciated.
::::Bill
::::
:::::Bill
:::::
::::: Can you see a grid in this tube? If not it might be an early rectifier?
:::::
::::: I'll send this to Tube Collectors Association. Jim Cross or Lud Sibley might know?
:::::
:::::Norm
:::::
::::::::::This tube has E. R. 507255 on the bulb and only an "S" near the pins. No other markings. What is it?
::::::::::Bill
::::::::::
::::::::::
:::::::::
:::::::::
:::::::::It might be an electron relay.
::::::::
::::::::I think the E. R. is for Eveready Raytheon.
::::::::Bill
:::::::
:::::::That appears to be a triode from the 1920's or perhaps earlier. The bayonet base with 4 pins looks like a tube from that era. I don't remember having seen that particular glass envelope though.
::::::
::::::It has to be somewhere in between the DeForest Audion and 01a.