I am approaching the end of the project. This 1060 phono preamp sounded phenomenal even with the old caps.
I started to replace the resistors and electrolytic, the plan is to replace it all.
As on the other boards the original films and polystyrene capacitors will stay, no need to replace those.
The original green Nissei films are good sounding and the polystyrene capacitors last forever, have low distortion and 1% tolerances.
The transistors 2SC458 become noise with age, it’s recommended to replace it with KSC1846 type. I have to do this latter, I need a transistor tester to be able to match transistors gain for left and right channel
Before photo
Progress photo:
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
Meh these were extra $70 as an open box item so it didn’t much to me either way:)
Modern physics would have us believe that the universe is made up of quarks, gluons, photons -- and morons
Jesus H. C H R I S T - Afterburner - can you ever be courteous and stay on topic. If you want to blather on about "Family Affair" start your own dam thread! I get tired of your inane comments. You're not clever and you're not funny and most time you're posts are completely irrelevant to the topic.
One upgrade that is worth mentioning, Marantz had implemented this mod on later unit.
To protect output transistors, a pair of diodes (UF4004) per were installed on the back of each power amplifier to function as flyback diodes for the output stage of each channel.
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
I consider this project successful, thanks to all the mentors at AK Marantz forum for their invaluable source of knowledge and kindness!
These little amps totally deserve restoration, it’s a great piece. The service manual can be downloaded at Hi-Fi Engine, It has the schematic dwg, full part list broken down by type and locations, also the board layouts which was very helpfull to plan the work.
The transistors have modern substitutions. It’s highly recommended to replace all 2SC458 transistors with KSC1845. Also, power supply H801 can be replaced with KSC2383YTA. There are a couple on the phono board.
These are some equivalent transistors:
H001-H004, 2SD217 On Semi
H705-706, 2SC371Y = BCS47
H707-706, 2SA562Y = BC221 or B327
H709-710, 2SC959 = 2N3440CS
H711-7712, 2SA606 = 2N5415 or 2N5616
I read that there’s eight 2SC1000 transistors on the preamp that can be replaced with 2SC1815 in case originals become noisy. It’s also recommended to upgrade diodes H802 and H803 with a fast soft recovery UF4005. There are another 2 diodes on the power amp that should replaced.
The amp plays several hours daily since rebuilt. It is difficult to turn it off. I understood the importance of “burning in time”, there was noticeable changes throughout the process.
It superseded all my expectations, sounds much better than the original without loosing its identity.
There is a sense of joy and accomplishment when I listen music through it. I don’t know what else to say without using the usual cheese adjectives
I never heard the original unit when new, but I like to believe that this one maybe sounding close to what it sounded when new.
I have been considering increasing the scope and maybe replace RCA jacks, speaker terminal and the skinny old power cord.?!
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
Comments
I started to replace the resistors and electrolytic, the plan is to replace it all.
As on the other boards the original films and polystyrene capacitors will stay, no need to replace those.
The original green Nissei films are good sounding and the polystyrene capacitors last forever, have low distortion and 1% tolerances.
The transistors 2SC458 become noise with age, it’s recommended to replace it with KSC1846 type. I have to do this latter, I need a transistor tester to be able to match transistors gain for left and right channel
Before photo
Progress photo:
Walnut case Vs acrylic case? ....
Dungeon: Dancer Mini-Two Diamond*Auralic Aries Mini*Dayens Ampino Preamp*Dayens Ampino Monoblocks*North Star Intenso DAC*Wireworld Oasis cables*Wireworld Oasis IC's*Wireworld Aurora power cables*IFI nano IDSD bl*Pangea Silver USB*Cambridge CXU*
Panamax MR5100*Panamax M8-AV-PRO*Furman PST-2+6
Headgear: Sennheiser HD 558*Audio-Technica ATH-M40x*Sennheiser HD 598 Cs*Audio-Technica ATH-MSR7*Philips SHP9500S* Sennheiser 6xx
Hello Kitty boombox
Spare sortta: Usher N-6361* ifi iDsd nano*Marantz 1504* RX-A1040*Emotiva XPA-1L Gen2 X2*Emotiva XPA-3 Gen2*CSiA6 Center*Monitor40 Series II*SVS PB1000 Sub*Sony BDPS6500 Blu-ray player*POS 37" LCD*Douglas Connection Furez 12 AWG 2 Conductor*Blue Jeans Cable LC-1's IC's*Samsung BD-H5900 3D Blu-Ray*Usher N-6361
Modern physics would have us believe that the universe is made up of quarks, gluons, photons -- and morons
Jesus H. C H R I S T - Afterburner - can you ever be courteous and stay on topic. If you want to blather on about "Family Affair" start your own dam thread! I get tired of your inane comments. You're not clever and you're not funny and most time you're posts are completely irrelevant to the topic.
there’s more than 100 hours on it, sounds so good!!! I can’t believe it is coming from this little amp...
It would be fun to do a blind test and AB it with a higher end piece...
To protect output transistors, a pair of diodes (UF4004) per were installed on the back of each power amplifier to function as flyback diodes for the output stage of each channel.
These little amps totally deserve restoration, it’s a great piece. The service manual can be downloaded at Hi-Fi Engine, It has the schematic dwg, full part list broken down by type and locations, also the board layouts which was very helpfull to plan the work.
The transistors have modern substitutions. It’s highly recommended to replace all 2SC458 transistors with KSC1845. Also, power supply H801 can be replaced with KSC2383YTA. There are a couple on the phono board.
These are some equivalent transistors:
H001-H004, 2SD217 On Semi
H705-706, 2SC371Y = BCS47
H707-706, 2SA562Y = BC221 or B327
H709-710, 2SC959 = 2N3440CS
H711-7712, 2SA606 = 2N5415 or 2N5616
I read that there’s eight 2SC1000 transistors on the preamp that can be replaced with 2SC1815 in case originals become noisy. It’s also recommended to upgrade diodes H802 and H803 with a fast soft recovery UF4005. There are another 2 diodes on the power amp that should replaced.
The amp plays several hours daily since rebuilt. It is difficult to turn it off. I understood the importance of “burning in time”, there was noticeable changes throughout the process.
It superseded all my expectations, sounds much better than the original without loosing its identity.
There is a sense of joy and accomplishment when I listen music through it. I don’t know what else to say without using the usual cheese adjectives
I never heard the original unit when new, but I like to believe that this one maybe sounding close to what it sounded when new.
I have been considering increasing the scope and maybe replace RCA jacks, speaker terminal and the skinny old power cord.?!