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Nakamichi BX-1 Calibration?

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hello everyone I have problem with my nakamichi bx-1 tape deck it is 2 head system.
with following problem topics.
1. left channel has a louder than right channel after recording. (it same with new cassettle)
2. how to adjust bias.
i don't have any tools to calibration a tape deck.
can should i do
(i apologise for broken english)

Passive summing, OTB calibration

Ok, so I just moved OTB by building my own 8 channel passive summing mixer (DIY Recording Endless Summer) and I would like some input on calibration. Here is my setup:

Logic Pro with a MOTU 828mk3 Hybrid

All 8 analog outputs are being used as 4 pairs of stereo stems (1/2, 3/4, 5/6, 7/8)

Each stem inputs to the 8 channel passive summing mixer

BASF 2in 24track 30 ips calibration tape

I have one of these left over from my when i bought a Sony JH 16 24 back in the the late nineties. I barely used the tape before ditching the Sony because it was just not reliable enough to use (without a full time tech on the staff!). Is it worth anything? Someone told me that it would probably need baking - is that true.

Calibrating Meters in a hybrid studio

Forgive some basic questions but I would like to hear this being explained like I was just starting out.

I assume the analog gear I bought is calibrated correctly but matching the levels between all my analog equipment (converters, summing amps and processors) needs to be matched so everything flows openly and sounds the best is can. Yes and why?