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#1
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Questions on using Old Tape electronics without the transport.
I have a Magnicord 1024 reel to reel which has not been used in near to 20
years when it worked fine. I want to use the microphone preamps but not the tape transport. This model is a transistor (not tube) version. 1) On first turn-on after 20 years would it be wise to use a Variac (which I do not have-but might be able to borrow or build an alternate) to warm up the components slowly? Or given that these are preamps stages is this not necessary? Ie no capacitors of any significant size that would need reforming? 2) The Magnecord 1024 had the preamps and electronics separate from the transport. Two cords where used to plug into the transport. In using the preamps only, I had not intended to plug to the transport. Does anyone know if running the electronics unplugged to the transport would hurt any part of the electronics? I am hoping it is designed such that this can be done. I am expecting that the call to the biasing current occurs only when the record button on the transport is engaged. And in it's absence, only the microphone preamps will be on. Or anything else on has no issue being open ended. But I am unsure. Does anyone know? Thanks, Marc |
#2
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Questions on using Old Tape electronics without the transport.
"Marc Harmon" wrote ...
I have a Magnicord 1024 reel to reel which has not been used in near to 20 years when it worked fine. I want to use the microphone preamps but not the tape transport. This model is a transistor (not tube) version. Why? Do you imagine it has some sort of magical properties? The mic preamps built into most recorders of that era were not notable for much of anything. |
#3
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Questions on using Old Tape electronics without the transport.
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#5
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Questions on using Old Tape electronics without the transport.
Use the schematic, and keep in mind the bias osc is probably
transformer coupled and probably should be disconnected lest it burn something up. The lytics should probably be summarily replaced, but if not feasible, I would bring them up by unhooking them and bringing them up with a DC supply through a high value resistor. You might even take them out to do this if they are screw terminal and clamp mounted lest they not blow their guts all over your boards if they go. You can build good mic pre's pretty cheaply and it's doubtful what you have there is terribly good, but they are probably better than the tube Ampex electronics so many bad engineers now use. |
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