I have a QED tape switch box that converts 1 tape loop into two. I'm sure others make them also. Maybe try Niles also.
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Thanks for those thoughts. I will look into them if i have to. I was hoping to use the Y connectors I have here to save some $$$$ but don't want to damage anything. There is another post going on of similarity but the guy is not refering to 2 tape decks, but other sources instead. There have been answers as to don't do it to it's OK to do it. I was wondering if being 2 tape decks make the situation any different?
Perhaps you could use a Y on the tape out taking the signal to the inputs on both tape recorders and take the signal from the tape recorders to different inputs on the pre-amp for each tape recorder (one of the vacant inputs and the one designated for the input on the tape loop to use for monitoring that one tape recorder. The other would be for recording and playback but not monitoring during recording. That would work although you might have a problem if some how you tried to record a signal from the tape out that was emanating from the same tape recorder you were using to record, as if anyone could be that dumb! :-)
You've seen my comments in the other thread you referred to. They are equally applicable to your situation. Using y-adapters to connect two line-level outputs together might work ok in some situations if you don't have both devices powered up at the same time, but it is not a good idea IMO.
The only risk in Newbee's suggestion is the one he mentioned. If you inadvertently set the preamp such that the output of the deck that is being used for recording is selected by the input select switch, a large oscillation would result that could conceivably damage your system, the speakers in particular.
Personally, I would go with a switchbox.
Personally I would use the five finger device, they are free. Just set up your tape decks (or pre-amp) so that the connections are accessible. That way you get full tape/monitor/playback capability with no signal degradation and no equipment risk.
Years ago I had two amps set up so I could switch them. My pre-amp had two live outputs always connected. The 'only' risk was if both amps got turned on at the same time. Well I ain't that dumb or careless. You bet! You guessed it - one day it happened. My big Threshold amp survived........I became a 'simple is best' believer and have never had a problem since.