Hi,
could someone help me locate the signal capacitors of the Marantz PM80 MKII amplifier?
thank you
could someone help me locate the signal capacitors of the Marantz PM80 MKII amplifier?
thank you
thanks a lot duncan2.
johnmath I was referring to the audio signal.
I would like to replace the old capacitors with Elna Cerafine or Elna Silmic II or Nichicon KZ capacitors
johnmath I was referring to the audio signal.
I would like to replace the old capacitors with Elna Cerafine or Elna Silmic II or Nichicon KZ capacitors
sorry so the audio signal capacitors for Marantz PM80 MKII are only:
C509: 10uF 50V
C510: 10uF 50V
C415: 10uF 50V
C416: 10uF 50V
Do you give me confirmation? thanks
C509: 10uF 50V
C510: 10uF 50V
C415: 10uF 50V
C416: 10uF 50V
Do you give me confirmation? thanks
A lot of coupling capacitors are 10µF/50v, but do not have DC across them. I would change them to Nichicon Muse 10µF 50v bipolar. Someone posted a link in DIYaudio recently that showed much lower distortion when bipolars are used in this application.
Caps used for feedback decoupling are also important in audio quality. These are usually larger values and any of your suggestion are fine, also Elna Tonerex, Nichicon Fine Gold.
Caps used for supply rail filtering of input stages also affect audio quality because they make sure that the ±rails are effectively audio grounds, so where practical use audio grade caps here too. They are often implicated in residual hum levels so it doesn't hurt to double their values where practical to drop supply ripple voltages by 6dB. These caps are usually 100-470µF or so.
Phono stage: coupling C415/6 10µ/50v, MC/MM selection C405/6 100/25; supply filtering C419/20 470µ/25.
Volume stage: coupling C509/10 10µ/50; supply filtering C511/12 330µ/16v.
Tone stage: coupling C601/2 1µ/50v, C609/10/15/16 10µ/50v; supply filtering C625/6/7/8 220µ/25v.
Power stage: coupling C713/4 10µ/50; feedback C711/12 100µ/25; virtual ground coupling C709/10 22µ/50; supply filtering C715/16 220µ/63v, C719/20 330µ/63v.
Caps used for feedback decoupling are also important in audio quality. These are usually larger values and any of your suggestion are fine, also Elna Tonerex, Nichicon Fine Gold.
Caps used for supply rail filtering of input stages also affect audio quality because they make sure that the ±rails are effectively audio grounds, so where practical use audio grade caps here too. They are often implicated in residual hum levels so it doesn't hurt to double their values where practical to drop supply ripple voltages by 6dB. These caps are usually 100-470µF or so.
Phono stage: coupling C415/6 10µ/50v, MC/MM selection C405/6 100/25; supply filtering C419/20 470µ/25.
Volume stage: coupling C509/10 10µ/50; supply filtering C511/12 330µ/16v.
Tone stage: coupling C601/2 1µ/50v, C609/10/15/16 10µ/50v; supply filtering C625/6/7/8 220µ/25v.
Power stage: coupling C713/4 10µ/50; feedback C711/12 100µ/25; virtual ground coupling C709/10 22µ/50; supply filtering C715/16 220µ/63v, C719/20 330µ/63v.
Because it can be hard to track down audio grade caps I have been inclined to buy the kits from Audio High Store and then substitute any I want different to what they supply.
Warning: it often takes many weeks for their kits to arrive, at least here in Australia. They also occasionally supply the odd incorrect part; it pays to check carefully.
Also check the polarity of capacitors as you take them off the circuit board as occasionally the silk screening is incorrect. A reversed capacitor can go 'bang' like a firecracker.
Marantz PM-80MkII Upgrade Kit Audio Capacitors
Warning: it often takes many weeks for their kits to arrive, at least here in Australia. They also occasionally supply the odd incorrect part; it pays to check carefully.
Also check the polarity of capacitors as you take them off the circuit board as occasionally the silk screening is incorrect. A reversed capacitor can go 'bang' like a firecracker.
Marantz PM-80MkII Upgrade Kit Audio Capacitors
At least one power transistor is faulty in one of the channels of my PM80 Mk1.
My thought was to replace all the power transistors with 2SC5200 and 2SA1943 with appropriate adjustments.
Would anyone care to comment?
My thought was to replace all the power transistors with 2SC5200 and 2SA1943 with appropriate adjustments.
Would anyone care to comment?
If the load on the amplifier is not too big then an option would be yo disengage the faulty pair and run on one set of output transistors.
If its the original manufacturer of =2SA1265+2SC3182 BJT,s its Toshiba but due to politics / international court action changes were made in the manufacturer .
If they are marked Sanken then that's a different story.
If they are marked Sanken then that's a different story.
Don't order the wrong size/style of replacements either. Toshiba's original 2SC5200/2SA1943 are large, TO264 style, AKA TO3-PL. As they are becoming obsolete, they're now replaced by Chinese made TTC5200/TTA1943). These have a smaller die inside but otherwise the same specs as the original Japanese type.
The Toshiba (Japan) equivalents are now standard TO3P-N style 2SC5242/2SA1962 or 2SC5200N/2SA1943N and these would be better substitutes if your current output transistors are of that standard, smaller TO3P size, like the MT100 style Sankens.
The Toshiba (Japan) equivalents are now standard TO3P-N style 2SC5242/2SA1962 or 2SC5200N/2SA1943N and these would be better substitutes if your current output transistors are of that standard, smaller TO3P size, like the MT100 style Sankens.
Last edited: