Out broad amp is a kind of up grade of tape recorder but how to connect to the head is a question. closer is better too far away (too long cable or weirs) will create problems. here what I did with A80RC A810 and PR99
In A80RC very simple use two extra card (pictures) to replace repro card direct plug to mother broad will do, and can just put repro card back for comparison stock sound
A810 can not directly connect to the head pins because there has a metal tube protection in what we can do is from the in put of it's pre pre amp to add a switch in this point will help back to the stock sound
I replaced the record head to a 4 track re pro head of a PR99 deck that I can listen some pre recorded 4 track tape and add switch for back to stock in 2 track only but no more recording of this machine
tony ma
In A80RC very simple use two extra card (pictures) to replace repro card direct plug to mother broad will do, and can just put repro card back for comparison stock sound
A810 can not directly connect to the head pins because there has a metal tube protection in what we can do is from the in put of it's pre pre amp to add a switch in this point will help back to the stock sound
I replaced the record head to a 4 track re pro head of a PR99 deck that I can listen some pre recorded 4 track tape and add switch for back to stock in 2 track only but no more recording of this machine
tony ma