Hi there!
I am in the process of calibrating my G-16S.
I religiously folowed the Service Manual and adjusted the playback levels with my MRL tape at 0 VU (-10dB) (quite a "flat" reponse for a 1/2" 16 track!). So I guess the payback/sel sync head is OK.
Now I am in the bias setting...
The Service Manual doesn't say much about it:
1. Rotate Sync crosstalk at the center
2. Put all 24/16 tracks in record
3. Turn the BIAS ADJUST muti-turn pot until it reaches the peak,
4 . And then turn the BIAS LEVEL so that the level drops at 100mv.
I figure this method works well with a brand new or freshly relapped head.
Now, I followed this method (with no signal recorded and no tape on the machine) and I still have some significant differences between 1K and 10K, both played at -10dBV.
The manual claims that there should be a +/- 1.5dB difference, but I get 1.8dB (ok), 2.3 dB (not so good) and even 3.3dB (Ouch!) more gain with 10K compared to 1K (with NR OFF)!
So I guess that I should:
1. Record a 10K signal on a tape on each track and then.
2. Find the peak with the BIAS ADJUST pot (CLOCKWISE?) with Playback after record method.
3. Drop -3.5dB or -4.5dB as recommended on the web from the peak level with the BIAS LEVEL pot (COUNTER-CLOCKWISE?).
I'll set the bias for +6 tapes, although I'll be using +9 tapes as well. But I don't want to reset the bias all the time, so my reference tape will be +6.
For that, I guess I should use the PAR technique (playback after record) to see how the changes did affected the signal.
Am I right?
Thanks a lot for your guiding lights!
Guillaume, Qu?bec, Canada
Fostex G-16S bias adjustment
Fostex G-16S bias adjustment
ANALOG'S NOT DEAD!
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