Elias, A 3 volt bulb should work as intended with your two 1.5v c-cells. Hope this helps, Lance Selma, NC 27576 -----Original Message----- From: Elias_Roustom <elroustom@xxxxxxxxx> To: rollei_list@xxxxxxxxxxxxx Sent: Tue, Aug 17, 2010 11:01 pm Subject: [rollei_list] OT: Light bulb for slide viewer Hi all - I need a little light bulb for a very old slide viewer. E10 base bulb, don't know what voltage or wattage I need. Nothing on the viewer. C sized batteries fit inside. Any ideas? Thanks, Elias--- ollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' n the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at ttp://www.freelists.org/archives/rollei_list