Forgetful Adventures in ancient Becker Cassette Technology
As a recap, the other day I recorded some music on a Cr02 tape using Dolby C compression on my home cassette deck. My home cassette deck is an Aiwa AD-F770. For those unfamiliar with this deck (I would assume that would be pretty much everyone except for Mr. BigAudioSnob, excuse me,
@kegmankipp 

), this is a pretty darn good deck. It has Dobly B/C/HX Pro, automatic normal/Cr02/Metal selection, auto tape bias-calibration, and is certainly not an auto-reverse deck. Its not as good as the really awesome Nakamichi decks of the era, but it is a proper 3 head deck, and the recordings on this deck sound
fantastic. Pushing in the "Monitor Source / Tape" button while recording something on this deck yields a nearly indistinguishable different in sound quality to my wooden ears.
www.hifiengine.com
So I played the tape back on the Becker 1432.
I was careful to select Dolby C. Dang, that recording sounded like
total crap. It was warbly, sounded 1/4 octave or 1/8 octave too high, and the high midrange just BLARED everywhere. I had to crank down the treble button just to make the tape remotely listenable!!! UGH!
So just as a reference check, I played the same tape back in this other, slightly newer Becker tape deck (CR-220), again careful to select Dolby C:
And my gosh, the tape didn't sound perfect but it sounded much MUCH MUCH MUCH better in the CR-220 than in the older BE1432 in the 500E and all that wabliness and upper midrange BLARING was gone.
I suspected something was wrong with my deck. Maybe tape speed was off.
@sheward and
@aliking very very very kindly posted me spare decks to use. (thank you thank you thank you!!!!) And while I had my center console apart the other day to tighten up the gear shift knob and to clean the fader wheel, I plugged in a spare deck. Much to my chargin, I got the SAME WARBLING! SAME UPPER MIDRANGE BLARING!!!! ARRRGHHHH!!!
I started questioning my home Aiwa deck. Does it need azimuth adjustment for the tape head? Surely all the BE1432s cannot be out of adjustment. What the?!?!?!?!
And then something dawned upon me.
THIS BUTTON:
This is the Cr02 button! I totally forgot that this button existed! Defeated by the Becker penchant for making completely inscrutable user interfaces once again! My home Aiwa deck has automatic tape bias selection so I hadn't even thought about this!!!! And then when I played the tape back on the BE1432 with this button,
EVERYTHING SOUNDED GREAT AGAIN! I HAD FORGOTTEN THAT SETTING TAPE BIAS WAS A THING!













And...... thinking back on it --- that upper midrange warbling was only EXACERBATED by the Dolby C compression / decompression circuit which is NOTORIOUS for doing crazy things in the upper midrange, ESPECIALLY when tape bias is set incorrectly!!!
But but but ....... I didn't set the tape bias in the CR-220.

Why did that sound so normal???!?! And so I tried the CR-220 again, and I looked at it carefully. Veeeeeeerrrrryyyy carefully ------ do you notice anything? Like the LACK of anything?
Thats right!
The newer CR-220 Becker Tape Deck DOES NOT EVEN HAVE THE ABILITY TO SELECT TAPE BIAS (NORMAL/CR02!!!) So the CR-220 (which is similar to Traffic Pros) is probably built to some mediocre "compromise spec" where all tape biases sound about right. And the specs --- 50Hz-14,000Hz for the CR-220 bear this out. I couldn't find the specs to the older BE1432, and, of course, the specs for the home Aiwa deck are much much better.












So for the 0.0000001% of people who still like to play with tapes (I'm pretty sure that's zero people) that's my story.