Hello all. Can 6D6 or #58 tubes be substituted for #78's , or could this cause problems??This is for a Philco 39.

:Hello all. Can 6D6 or #58 tubes be substituted for #78's , or could this cause problems??This is for a Philco 39.
:
6D6 and 78 are both 6.3 volt filament... but the 58 is 2.5v

Compare all the specs here:
http://www.nj7p.org/Tube4.php?tube=58

Chris

6D6 can be subsituted for a #78 but is a little taller and may require a shield.

As Peter said #58 is a 2.5 volt filament tube. Other than that same as 6D6 and similer to 78.

Norm

::Hello all. Can 6D6 or #58 tubes be substituted for #78's , or could this cause problems??This is for a Philco 39.
::
:6D6 and 78 are both 6.3 volt filament... but the 58 is 2.5v
:
:Compare all the specs here:
:http://www.nj7p.org/Tube4.php?tube=58
: