[RickC]

I am new to Radio restorations, so please excuse me if I make an error.

I am posting the following to help others, and myself, to find the correct bulb replacement for the Philco 15DX.

The Radio Service Data Sheet shows the following:

Pilot Light V12
Pilot Light (Shadow Tuning) V13
Cabinet Light V14

On the bottom right of the Radio Service Data Sheet is the following:

…V12, V13, V14, 6.3 V

The Replacement Parts Model 15 Series shows:

Pilot Light 6008
Pilot Light (Shadow Tuning) 6008
Cabinet Light 6600

The Philco Parts Catalog 1936 shows:

6608 6-8 volts 250 ma Blue bead color Type D (looks like a sewing machine bulb)
6600 Not Listed

The Philco Library shows:

6608 Equivalent No. is 46

Page one of this Thread talks about the Cabinet Light bulb having an E17 base and the bulb is possible shaped like a sewing machine bulb. 
The (replacement) Cabinet Light bulb presently in my radio appears to have an E17 base but is spherical in shape.  It is rated at 120 volts and 40 watts.

The following is a summary of what I have found:

Pilot Light V12 6008 6.3 volts 250 ma blue bead D type #46
Pilot Light (Shadow Tuning) V13 6008 6.3 volts 250 ma blue bead D type #46
Cabinet Light V14 6600 6.3 volts E17 base sewing machine shape?

I am seeking information on the Cabinet Light bulb replacement and hoping my research concerning the Pilot Lights is correct.