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HD3 v level at 315 Hz for 62 different cassette tapes

Measurement Setup:

Nakamichi BX-300E cassette deck
PC with RME Digi 96/8 PAD sound card
HP 3478 RMS multimeter
AudioTester Software.

Level 250mV on the graphs is equivalent to 250 nWb/m (set by BASF reference tape).
Frequency is 315 Hz, measured 3rd harmonic only

The bias level for all cassettes was set for a flat frequency response.

Here is an approximate scale reference in mV v dB for this setup:

700 mV = +13 dB VU
600 mV = +11.5 dB VU
500 mV = +10 dB VU
400 mV = +8 dB VU
300 mV = +5.5 dB VU
250 mV = +4 dB VU = 250 nWb/m , DIN Reference Level
215 mV = +2.7 dB VU = "Dolby Level"
160 mV = 0VU
80 mV = -6 dB VU
40 mV = -12 dB VU
20 mV = -18 dB VU

NOTES:
on the X-axis shown the relative measured RMS output level from the tape in mV
on the Y-axis shown the 3rd harmonic in dB

Here is an approximate scale reference of HD3 level in dB v HD3 level in %:

-20 dB = 10 %
-30 dB = 3% , at this distortion level the Maximum Output Level (MOL) is usually measured
-40 dB = 1%
-50 dB = 0.3%
-60 dB = 0.1%
-70 dB = 0.03%

BASF_Chromdioxid_Maxima_II	BASF_CMII	BASF_CMII_old_1	BASF_CMII_old_2	BASF_CMII_old_3	BASF_CMII_old_4
BASF_CSII	BASF_FEI	BASF_FMI	BASF_IEC_II_Primary_Reference	BASF_IEC_I_Primary_Reference	BASF_Reference_II_Master_C10
BASF_TPII_C60	BASF_TPIV	DarkLab_Chrome	Fuji_DR	Fuji_DRII	Fuji_ZII_C60
Maxell_Metal_CD_C110	Maxell_MX	Maxell_UDII_CD_C60	Maxell_UD_XLII	Maxell_UR	Maxell_XLIIS_C46
Maxell_XLIIS_C90	Maxell_XLII_chair	Maxell_XLII_oval	Maxell_XLI_S_C60	Memorex_CRXIIS	Mr_Audio_SF
MTV_Super_Ferric_PRC	NoName_Japan_C30	Philips_CD_Extra_Chrom	Philips_CD_one	Philips_Ferro_FS	Sony_CDit_I
Sony_CDit_II_C60	Sony_FXI	Sony_FXII	Sony_Metal_ES	Sony_Metal_SR_C110	Sony_Metal_XR
Sony_UXPro	Sony_UXturbo	Sony_UX_C60	Sony_UX_S_C60	STRAND_GOLD_SF	TDK_CDingII
TDK_D_new	TDK_D_old	TDK_FE	TDK_MAex	TDK_MA_new	TDK_MA_old
TDK_MA_R	TDK_MA_XG	TDK_SA_1988	TDK_SA_new	TDK_SA_X_new	TDK_SA_X_old
TDK_SM_X_C10	Thats_MR_X_Pro

JAlbum 7.1