Garrard model 1000 (transistor question)
Posted: Sun Jun 16, 2024 8:26 am
Good morning everyone!
i may be in the wrong place for this, but i will ask anyhow...
i have been tasked with trying to restore this older record player. i am unsure of the manufacturer, but the record deck is a Garrard Model 1000. i guess back in the day, Garrard would just export the deck, and then whatever manufacturer received it would make their own housing and add their own electronics, making finding a schematic impossible. no biggy, since everything i have tested it out of tolerance, i just went through and replaced all the caps and resistors. unfortunately, i dont know much about transistors, and this unit has a few. i have been trying, but have so far been unsuccessful in identifying them correctly.
the two transistors that i suspect are the ones being used as amplifiers are clearly texas instruments transistors, you can see the TI symbol printed right on it...after that it says SC4131-1 and 6543 below that. you would think this should be easy to identify and find a replacement for, but i cant make head or tails of it. there are a few other, smaller transistors, but they show even less information, so for now i am just going to leave them out.
i would post pictures, but the transistors are in a rats nest of components. if i can get a clear shot i will post, but a picture wont show you much more than what i have already described. they arent modern transistors, these look more like nuts for a threaded fastener, and are in fact bolted to the frame through the top of the transistor...i assume this is for heat dissipation.
im hoping i didnt post this query in the completely-wrong forum! please forgive me and disregard the question if so!
thanks everyone!
Brian
i may be in the wrong place for this, but i will ask anyhow...
i have been tasked with trying to restore this older record player. i am unsure of the manufacturer, but the record deck is a Garrard Model 1000. i guess back in the day, Garrard would just export the deck, and then whatever manufacturer received it would make their own housing and add their own electronics, making finding a schematic impossible. no biggy, since everything i have tested it out of tolerance, i just went through and replaced all the caps and resistors. unfortunately, i dont know much about transistors, and this unit has a few. i have been trying, but have so far been unsuccessful in identifying them correctly.
the two transistors that i suspect are the ones being used as amplifiers are clearly texas instruments transistors, you can see the TI symbol printed right on it...after that it says SC4131-1 and 6543 below that. you would think this should be easy to identify and find a replacement for, but i cant make head or tails of it. there are a few other, smaller transistors, but they show even less information, so for now i am just going to leave them out.
i would post pictures, but the transistors are in a rats nest of components. if i can get a clear shot i will post, but a picture wont show you much more than what i have already described. they arent modern transistors, these look more like nuts for a threaded fastener, and are in fact bolted to the frame through the top of the transistor...i assume this is for heat dissipation.
im hoping i didnt post this query in the completely-wrong forum! please forgive me and disregard the question if so!
thanks everyone!
Brian