[kramer5150]

In a 24V Morgan Jones / earmax are these two electrically compatible? (ignoring overall height dimensions)
 
6GW8
http://www.drtube.com/datasheets/6gw8-rca1965.pdf
 
6GM8
http://www.shinjo.info/frank/sheets/035/6/6GM8.pdf
 
thanks!!

 

[tomb]

  In a 24V Morgan Jones / earmax are these two electrically compatible? (ignoring overall height dimensions)
 
6GW8
http://www.drtube.com/datasheets/6gw8-rca1965.pdf
 
6GM8
http://www.shinjo.info/frank/sheets/035/6/6GM8.pdf
 
thanks!!

Hi Kramer!
 
No, not really.  The 6GM8 is probably the Cadillac of space-charge, low-voltage tubes.  If you look at the data sheet, the Plate Voltage is limited to a maximum of 30V - same as the Millett tubes in a Millett Hybrid (12AE6, 12FM6, 12FK6).  However, the data sheet for the 6GW8 that you've provided indicates 250V on the plates, with a maximum of  550V.
 
They are not the same tube.  Like any high-voltage tube, its linearity and performance will suffer greatly at voltages below 250V.  It might run in the same circuit as a 6GM8 because the heater voltage is the same (6.3V), but since it will be looking for 250V at B+, it will always be deficient in a low-voltage circuit.

 

[kramer5150]

Ahh OK got it.  I was only looking at heater voltages, thinking (more like hoping actually) I had found a suitable replacement.
 
thanks tomb