Recently bought a CA-1000 off EBay.
Listing stated:
The unit has been repaired and serviced, and it is in good working condition with clear sound output. The block capacitors, deteriorated transistors, electrolytic capacitors, resistors, and lamps have been replaced.
The switches and volume controls have been cleaned with electronic parts cleaner and treated with contact restorer. There is no noticeable crackling noise, and the sound output is smooth and stable.
The power circuit has been adjusted, including DC balance and bias adjustment. The cabinets, front panel, and knobs have been disassembled and thoroughly cleaned.
The terminal section and all connections are in good condition. The bottom panel and insulators are also well maintained. The internal components and circuit boards are clean.
everything seemed good for a couple days and then started to notice some questionable things.
Symptoms, in order of appearance:
1. A fuzzy/hissing noise audible from the speakers, even with the volume turned all the way down. This is audible from about 5 feet away in a quiet room, on all inputs (Tuner, Aux, Phono, Tape).
2. When using the Phono input specifically, this noise scales up noticeably as the volume is increased — even with nothing connected to the Phono RCA inputs at all.
3. No hum or buzz at any point — the noise is strictly hiss/fuzz, not 60Hz hum.
4. Scratching when operating the “Loudness” knob.
5. Most recently, I’m now hearing a crackling/ticking sound coming from inside the chassis itself (not through the speakers) — it sounds similar to a Geiger counter.
Frankly, I’m clueless. This is my first amp, so I don’t even know what to think. Would appreciate any help at all.
Listing stated:
The unit has been repaired and serviced, and it is in good working condition with clear sound output. The block capacitors, deteriorated transistors, electrolytic capacitors, resistors, and lamps have been replaced.
The switches and volume controls have been cleaned with electronic parts cleaner and treated with contact restorer. There is no noticeable crackling noise, and the sound output is smooth and stable.
The power circuit has been adjusted, including DC balance and bias adjustment. The cabinets, front panel, and knobs have been disassembled and thoroughly cleaned.
The terminal section and all connections are in good condition. The bottom panel and insulators are also well maintained. The internal components and circuit boards are clean.
everything seemed good for a couple days and then started to notice some questionable things.
Symptoms, in order of appearance:
1. A fuzzy/hissing noise audible from the speakers, even with the volume turned all the way down. This is audible from about 5 feet away in a quiet room, on all inputs (Tuner, Aux, Phono, Tape).
2. When using the Phono input specifically, this noise scales up noticeably as the volume is increased — even with nothing connected to the Phono RCA inputs at all.
3. No hum or buzz at any point — the noise is strictly hiss/fuzz, not 60Hz hum.
4. Scratching when operating the “Loudness” knob.
5. Most recently, I’m now hearing a crackling/ticking sound coming from inside the chassis itself (not through the speakers) — it sounds similar to a Geiger counter.
Frankly, I’m clueless. This is my first amp, so I don’t even know what to think. Would appreciate any help at all.
