calibrating tape decks

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)

Hey all! I finally decided to put the Rec/Repro cards back in the little Fostex 1/4" 8-track. Before anyone yells at me, it was free, m'kay!