pavement74
New Member
Hi. I just bought a 1969 Sansui 4000 and it sounds so sweet. Amazingly consistent from the bass to highs. I only use it play vinyl.
I noticed right away that it has a faint buzz/hum that gets louder as I turn up the volume. It's not noticeable when the music starts. This is my first vintage receiver, so I don't know if this is how all vintage receivers are or not. I didn't have the same noise in the receiver it replaced which was a newOnkyo A-9010. I use a Pro-ject turntable and Pioneer fs52 speakers.
I bought the Sansui from a seller on EBay who restored it. Here's what he did to it according to the listing:
I noticed right away that it has a faint buzz/hum that gets louder as I turn up the volume. It's not noticeable when the music starts. This is my first vintage receiver, so I don't know if this is how all vintage receivers are or not. I didn't have the same noise in the receiver it replaced which was a newOnkyo A-9010. I use a Pro-ject turntable and Pioneer fs52 speakers.
I bought the Sansui from a seller on EBay who restored it. Here's what he did to it according to the listing:
- replaced main filter capacitors and all capacitors on:
- F1169 EQ Amplifier Block
- F1150 Driver Amplifier Blocks
- F1187 Ripple Filter Block
- F1149 Tone Control Block
- F1176 Protector Block
- F1185 Multiplex Block
- all replaced with audio grade Nichicon capacitors with like values unless an exact replacement was unavailable in which case I replaced it with one of equal uF but higher voltage.
- replaced notoriously noisy 2SC458 transistors
- cleaned all controls both knob and push button with contact cleaner and DeOxit so they move freely and without any static or sticking
- cleaned inside surfaces with soft bristle brush and gentle compressed air
- polished and cleaned face plate and knobs
- replaced all lamps
- adjusted bias per service manual