I have always used 456 with my TEAC 80-8, most recently from Quantegy. My search shows that they have none in stock. Gotta finish a project and I ran out. Where can I get 1/2 inch tape?
I have been using RMGI 911 with good results as a replacement for 456 it is +6 and is very good.ATR is good also but RMGI sounds better to my ear subjective though.
Here is a spec sheet on it. http://www.rmgi-usa.com/resources/Analog-Media/RMGI_SM_911.pdf
The place to buy well there are a few places out there .You can try Ebay but be careful.Here is a online retailer for new SM911.