> Stupid Ques
There are no Stupid Questions.
> no bias knob, so is that bad?
No. That was typical until you got up in the $400 range (and in those days, $400 was a lot of money).
And even when there was a Bias adjustment, flattest response with any good standard brand tape was usually so close to the center of the adjustment that it was hardly worth fooling with.
(And back in reel-to-reel days, Bias adjustments that drifted off their settings were the bane of my life. Had a huge Ampex that would drop 4dB of bias if you bumped it....)
> my Sharp mini system would record metal tapes with low output, not enough bias current?
Did it have a setting for Metal tape at all? Cheap decks generally didn't. And the problem with Metal tapes was that you needed about twice as much record level (not just bias) to get the same playback level. And if the playback level wasn't what the recorder expected, your Dolby mis-tracked.
> auto tape selector
Golly, I'll have to do a gynecology exam on a cassette well to remember how that worked. {open wide, darling...} CrO2 sensed a hole next to the Record Lock tab. Metal tapes had a hole in the center of the spine. So peer up inside the well. Top Center is a big kick-out spring to hold the cassette tight. Top Right is the Record Lock finger to feel if you busted-out the Record tab. Next to that is the CrO2-hole sense finger. And over next to the kick-out spring, Metal-capable decks had an extra finger to sense the Metal-Tape hole.
If it does not have the third finger, and does not have a manual Metal setting, then don't even try to record Metal tapes on it. CrO2 will work much better than Metal recorded on the CrO2 settings.
> is that really bad for trying to make some good metal tape recordings?
How good is "good"? But Metal tape on a non-Metal deck is not going to work at ALL well. (And I never saw an "old Sharp mini Hi-Fi..." that was made to record Metal tape.)
> it's only 40 bucks
That, and your use of expensive Metal tape on a $9 Sharp mini-Fi, does say something about how "excellent" you can afford to be. (Yes, the transports in most of those mini-Fis sold wholesale for $9.)
Frankly, I've done a LOT (thousands) of live concerts on non-Metal tapes and unless I screwed-up, nobody complained. Because most of my work was Classical, I actually mostly used high-grade Normal tape. For Jazz, sometimes I resorted to CrO2 to get a few dB more headroom on cymbals. I did mess with Metal when it came out, but ya know what? In 95% of my work, the 6dB extra S/N possible with Metal didn't matter. Room noise was equal to tape noise with Normal tape, and decent (not mini-Fi) deck, and Dolby B. Dolby C, or DAT or CD-R, lets me be a lot sloppier with record level and still recover a usable recording (I've put 20 dB playback boost on CD tracks when the choir sang far softer than expected). But almost all real musical situations fit fine within Normal or CrO2 tape and Dolby B.
> supposely a Yamaha
What, did they file off the model number? You can tell a Yamaha by the logo on the engine... oh wait, this isn't a motorcycle. Seriously, Yamaha never made a deck that was bad, certainly nothing like the toy decks in mini-Fis. Be sure the heads and capstan are clean enough to lick, then clean some more. Pray that the belts are not about to die of old age. Stick in some good CrO2 tape, pay close attention to the level meters, and you will be amazed at the difference between any real hi-fi recorder and your mini-Fi.
> sound close if not better than my MD recordings..
CLOSE??? Hell, analog tape should sound better than that obnoxious sound on MiniDisks. I'm not golden-ear, but I can hear those digital MD digits grinding against each other. Fast analog tape is smooth and clean. Slow tape, as in cassettes, is a bit hissy and less crisp, but it is REAL. MD... it takes a while to notice the over-crunched digital approximation, and you can get used to it. There are worse sounds (like some mini-Fis). But you can get UN-used to MD's overcompression if you clean your ears with good analog tape.
> I keep wondering what a $1000+ Nak could do...
Better than a former-$300 Yamaha, but not drop-dead better. The Dragon will (IIRC) auto-calibrate to find that last dB of high end smoothness. It has more input and output options. The meters are more entertaining. It will have less flutter than the Yama (but either Nak or Yama will have MUCH-MUCH less flutter than an old cheep mini-Fi). Moving from a $9 transport to a $99 transport has already got you 98% of the way to the Nak's $999 transport. Many of us were very happy (and well paid) with machinery like your Yamaha.
-PRR