Geez....it's been a week already? Well, that's what happens when I get busy doing things instead of just blogging about them....
I spent a few days this week playing with the TEAC A-4300SX deck, as it has some bias adjustments you can make depending on what type of tape you're using, and I wanted to see if I could hear a difference between recordings made using the different settings. I have four types of tape to choose from, and I spent some time evaluating them. I have fifty 7" reels of the "Type 1" tape (standard tape, standard bias) that came with the first TEAC deck I bought. This is what most people know as "Recording Tape", and has a reddish-brown color. The "Type 2" tapes I have (low noise, standard bias) show a definite grey tint to them, and the "Type 3" tapes (low noise, high output) and "Type 4" tapes I have (high output, high bias) are a definite dark grey color, which look just like what I was using Back In The Day.
Four types of tape, and four different settings of the bias and equalization switches on the deck gave me sixteen different recorded segments to audition. And surprise, surprise, the settings recommended by TEAC for each type of tape were spot-on.
I can't tell much difference between the Type 3 and Type 4, but they're both much better sounding than the Type 1 and Type 2 tapes I have, with better high frequency response, lower noise, and a "cleaner" sound, so I'll be getting rid of the two "lower" grades of tape, and keeping the "higher" grades I have.
I'll post again tomorrow with some pix and updates on the Heath THD analyzer. I'm finally ready to run the calibration procedure now that I have the power supply issues sorted out.