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Front side with new 3.5mm jack

JPEG Image - 6.84 MB - 06/05/2023 at 21:40

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Back side with new switch

JPEG Image - 6.34 MB - 06/05/2023 at 21:40

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The RIAA compliance was measured by passing the audio scale from 2Hz to 44kHz through FFT 64k point analysis.

Portable Network Graphics (PNG) - 102.52 kB - 06/05/2023 at 21:29

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ART-DJPREII-mod2-THD_ for_1kHz(-40dB_Input_WBOscilator-LM4562-0.0004prcTHD).bmp

DJPre-II MOD with NJM2068DD as input pure sin wave at 1kHz generated by my WBOscilator(otput sin_w

Bitmap Image File - 3.54 MB - 06/05/2023 at 21:12

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Comparation sound resolution of NJM2068DD vs OPA1612(MOD2) or Bultin PLX500 PreAmp.png

Sound and resolution of DJPre-II MOD with NJM2068DD, My RiAA preamp with OPA1612 - MOD2 and builtin Pioneer PLX500 PreAmp

Portable Network Graphics (PNG) - 172.33 kB - 06/05/2023 at 20:41

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Comparation RIAA_40dB-MOD(FOM65k)Passive-PostAmp24dB vs DJPre-II MOD.png

FTT64k of one LP side recording pass thou Improved DJPre-II MOD and compared to my handcrafted RIAA premp.

Portable Network Graphics (PNG) - 184.58 kB - 06/05/2023 at 20:41

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ART-DJPREII-MOD2-Separation point from RIAA MOD1(FOM32K) and MOD(FOM65k) with 40dB(OPA1612)PreAmp.png

LPF trimming and its separation print from my handcrafted RIAA Preamplifier in FOM32k and 65K compliance form.

Portable Network Graphics (PNG) - 247.03 kB - 06/05/2023 at 20:30

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Art6_1.jpg

I start with this diagram from diyAudio forums post

JPEG Image - 363.26 kB - 09/21/2022 at 01:17

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Although I change all original electrolytic caps for new ones with audio grade Low-ESR spec, I put 1206 NP0 1nF SMD caps in parallel with 22uF input signal capacitors.

JPEG Image - 2.48 MB - 09/21/2022 at 01:14

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Audio Low-ESR electrolytic capacitors of different classes regarding its importance for signal path, same as for film MKP/MKT capacitors.

JPEG Image - 2.71 MB - 09/21/2022 at 01:13

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Power switch terminal pins disrupt power supply prior to big (10x then original) electrolytic capacitors (HI-Ripple current and Low-ESR) and linear power regulator.

JPEG Image - 1.99 MB - 09/21/2022 at 01:13

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