After my successful stint of upgrading my tube amp components its now time for my phono pre-amp components upgrade. I am planning change of the following components type in the preamp
Resistors - Metal oxide to metal film (unbranded Chinese to Vishay)
Electrolytic capacitors - Keltron to Nichicon
Coupling capacitors - DEC to Russian PIO - military grade
RIAA capacitors - unbranded Chinese to Russian PIO - military grade
Supply Bypass capacitors - unbranded Chinese to probably Wima or some other brand.
What will not be changed
PCB - will take a new PCB but the ckt still remains the same.
Opamp - This will be the same LM4562
Dual JFET - Will use the same smd chip
BJT - will use the same transistors.
Approximate cost of modifications - Rs.3500/- to Rs.4000/-
Hoping to complete this activity in another month or two and will post feedback after that.
Thanks for looking.
Resistors - Metal oxide to metal film (unbranded Chinese to Vishay)
Electrolytic capacitors - Keltron to Nichicon
Coupling capacitors - DEC to Russian PIO - military grade
RIAA capacitors - unbranded Chinese to Russian PIO - military grade
Supply Bypass capacitors - unbranded Chinese to probably Wima or some other brand.
What will not be changed
PCB - will take a new PCB but the ckt still remains the same.
Opamp - This will be the same LM4562
Dual JFET - Will use the same smd chip
BJT - will use the same transistors.
Approximate cost of modifications - Rs.3500/- to Rs.4000/-
Hoping to complete this activity in another month or two and will post feedback after that.
Thanks for looking.