Good people, help me please.
If someone has schematic of this amplifier, I would be extremely happy if he/she could post it here, or mail it to me. I managed to get a schematic of Ca-1010, but they are not really the same and I need a schematic so I could repair it. Even Yamaha Europe said they don't own schematic for this amplifier so if there is a good soul with a schematic...
thanks in advance
If someone has schematic of this amplifier, I would be extremely happy if he/she could post it here, or mail it to me. I managed to get a schematic of Ca-1010, but they are not really the same and I need a schematic so I could repair it. Even Yamaha Europe said they don't own schematic for this amplifier so if there is a good soul with a schematic...
thanks in advance
Don't know, it is probably more simmilar to 1010 than to 1000 as it is model from them 1010 series. Thanks for the effort anyway.
Try also www.stereomanuals.com . Specify the make, model and your need for a service manual. The agent's name is Rick; accepts paypal.
Thanks,
I have already found the CA-800 service manual. It is for the most like the CA-1000, just that the output is beefier (it uses 2SC1079 in output) and the CA1000 also has that very nice MC board - - - you might be able to plug in a I/V output of a current output (PCM58 . . ??).
The power supply board is the same.
The power supply board regulates 45V AC to +50V and -50V DC. The capacitors for the plus were completely gone (one in the first filter section fell apart as I took it out, and the second was dead too! [My sister always left the amp on ...]
Replaced the caps with Philips 63/220 muF and the amp works good again. Ripple extremely low - predominantly zener noise.
I ran it on the scope: high frequency roll off above 150 KHz, with a low shelving (it does not decrease fast; there are obviously several local compensations that work well).
Why only one half of the power supply was fried?
The power supply for the pre-amp stages (+50V) all go through the same filter bank as the +50V and -50V for the driver stages of the power amp. The preamps have one power supply: each stage has a capacitor on the input!.
-->> What I should do: make a second filter line for the preamp output of +50V.
I listened to it yesterday, using the pre-amp out (decoupled the power amp) with my F5 as amplifier.
I must say the sound is relaxed, the Loudness works well (sweet!). Sounds of singers are well staged, natural. But there is some veiling, in depth.
Easier, a more natural and relaxed sound than the Aikido, but lacking the direct attack of my standard tube stage [that tends to be a bit fatiguing at times]. . . but that is a different story.
I have already found the CA-800 service manual. It is for the most like the CA-1000, just that the output is beefier (it uses 2SC1079 in output) and the CA1000 also has that very nice MC board - - - you might be able to plug in a I/V output of a current output (PCM58 . . ??).
The power supply board is the same.
The power supply board regulates 45V AC to +50V and -50V DC. The capacitors for the plus were completely gone (one in the first filter section fell apart as I took it out, and the second was dead too! [My sister always left the amp on ...]
Replaced the caps with Philips 63/220 muF and the amp works good again. Ripple extremely low - predominantly zener noise.
I ran it on the scope: high frequency roll off above 150 KHz, with a low shelving (it does not decrease fast; there are obviously several local compensations that work well).
Why only one half of the power supply was fried?
The power supply for the pre-amp stages (+50V) all go through the same filter bank as the +50V and -50V for the driver stages of the power amp. The preamps have one power supply: each stage has a capacitor on the input!.
-->> What I should do: make a second filter line for the preamp output of +50V.
I listened to it yesterday, using the pre-amp out (decoupled the power amp) with my F5 as amplifier.
I must say the sound is relaxed, the Loudness works well (sweet!). Sounds of singers are well staged, natural. But there is some veiling, in depth.
Easier, a more natural and relaxed sound than the Aikido, but lacking the direct attack of my standard tube stage [that tends to be a bit fatiguing at times]. . . but that is a different story.
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