Hi Charles, I appreciate the info on the bulb. From your description of the No. 19 bulb used on the music rack light, I think that one is too big. However, your description of the 24CS seems to be the lamp I am looking for. It's clear, cylinder/cone shaped with two thin wires coming out the bottom end. I will take a photo of it and email it to you. Barry PS: I am not sure, but could this be the part number for the lamp: 1460-026? ======================= -----Original Message----- From: analogorgans-bounce@xxxxxxxxxxxxx [mailto:analogorgans-bounce@xxxxxxxxxxxxx] On Behalf Of Charles Strack Sent: Monday, May 07, 2007 7:19 PM To: analogorgans@xxxxxxxxxxxxx Subject: [analogorgans] Re: SOS "Expression Pedal not working" Hi, Barry, I don't have a part number cross reference, but will look through my various manuals tonight & see if I can identify the part number on one of the schematics. By the way, if it is a No. 19 bulb, it's the same kind they use on the music rack light. If it is a no. 19, then it's probably got socket clips. The no. 19 is globe shaped bulb with 2 pins coming out of the bottom. The 24CS is a cylinder shaped bulb, with wires (somewhat fragile looking) coming out of its bottom. It would be soldered into the board. Charlie --- bh <lexicon13@xxxxxxxxxxx> wrote: > Hi Charles, > > Thanks for your reply. I went through my Rodgers > Scarborough > 750 manual and came upon schematic 1600A (OUTPUT > PREAMP) and saw the > following: > > ON EXP PEDAL > ----------- > | +25 | > | | | > | | | (28) R5/1K LS > | 500 |<---O----O----~~~-----O---- EXPRESSION > | | | ] LAMP > |_____=____| O---- 1460-026 > | AFFECTS > | LDR'S 19,43,87,149 > = > > > Yes, Charles, you are right on target. I looked at > the OUTPUT PREAMP > and found the (CdS Cells) under a black cover; there > are four Cells > which surrounds the lamp. So, I turned on the organ, > turned on an 8' > Flute stop, used a pencil to lock in one of the key > signals on the GREAT > organ and took a flash-light to the back of the > organ and shined it on > the CDS cells where the lamp is located and the > organ volume went up and > down as I shined the light on and off the lamp area. > Wow, I would have > never thought to have looked there. Let me know if > the above specs > relates to the correct lamp that I need and if you > have any, please let > me know. > > Barry