P. H. Hobbies P.H. Hobbies made many different sound boards, some direct sell, some OEM.Paul Housey was the owner of the company. P H Hobbies, Inc., 6861 T Dr. S. , Athens, Michigan 49011 was founded in 1986. Phone Number: 517-741-4221, Fax Number: 517-741-4136 Prices for their products ranged from $60 to $310 (old Walthers catalog) I've put a few of them here on the web site, to help identify the models. I have been collecting wiring notes as I go. I may have the wiring for yours, just drop me an email. Any pictures of different units, or model numbers or corrections is appreciated. S1001S S2001 S3003S S3005 S4004 S4005 S4501 I got a P. H. Hobbies sound system in the 2-10-2 I got from Rex Ammerman. This board was made somewhere after the 19th week in 1990. Right now I'm just documenting the wiring connections. There is a connector right by the 4 diodes by the end of the board away from the IC's calling pin 1 closest to the end of the board: motor input not used motor input battery + battery - not used battery used was a nicad, 4 cell, 5.6v, probably works to 6 v there is a 2 pin speaker connector on the other long side of the board, marked SPKR there is another multi-pin connector in the middle of the same long side of the board as the speaker connector, calling pin 1 closest to the same end of the board (away from IC's) chuff reed ? chuff reed whistle reed whistle reed bell reed bell reed Here's another PH Hobbies board, I believe this is the one OEM'd to Aristo