Hi gents ,
My counterpoint hybrid pre has suddenly developed an issue, I wish to ask for help/advice but because it’s a hybrid I don’t know if I should post in the solid state or valve section.
Andy
My counterpoint hybrid pre has suddenly developed an issue, I wish to ask for help/advice but because it’s a hybrid I don’t know if I should post in the solid state or valve section.
Andy
Well it has a stand by/ ready mode which it’s always left in ( red led on ) and then when you flip the power on the red stand by led turns green and then flashes for around 30 seconds and then when working properly the led stays green and you can hear a click too .
I’ve come home today and the red stand by led isn’t on anymore ( fuses are good )
There is a 6ca4 rectifier tube in this circuit, the tube is less than 6 months old .
I have the schematics
I’ve come home today and the red stand by led isn’t on anymore ( fuses are good )
There is a 6ca4 rectifier tube in this circuit, the tube is less than 6 months old .
I have the schematics
Moving this thread to analog line level.
Post the schematic here.
The red LED should be in the semiconductor section of the power supply.
Post the schematic here.
The red LED should be in the semiconductor section of the power supply.
Sounds to me like there is way more solid state stuff in there than tube. Some sort of power supervisor circuit that either isn’t working or telling you that a tube isn’t working. In any case you start by analyzing what that supervisor circuit is trying to tell you, which makes it a solid state problem. At least initially.
There are quite a few schematics and they have someone’s name and email on etc so I’m not too sure about posting them 🤷♂️
Sadly that’s not possible as it’s like a copyright print across the entire schematic and on the bottom of every page.
I’ve no clue how I came by it either
I’ve no clue how I came by it either
If it has copyright, then you cannot reproduce the image.
Here is an early SA-3000, no copyright, but it has no power supply.
Here is an early SA-3000, no copyright, but it has no power supply.
Retitled the thread in the hope that it will attract more attention.You cannot post copyrighted material here without the copyright owner's permission, but you can post a hand drawing of the same thing if you need to do so, and partial snippets should be OK under fair use.
Good luck with the repair, I worked on Counterpoint gear in the past and getting the right information and parts can be a challenge.
He says the small tubes don't light up, and the bicolor LED doesn't work, so there is no audio.
Seems like more than one problem there, but we'll try to narrow it down.
If he's lucky, it's just the filament power supply problem killing the audio.
The LED problem may not mean the control circuit is bad.
Seems like more than one problem there, but we'll try to narrow it down.
If he's lucky, it's just the filament power supply problem killing the audio.
The LED problem may not mean the control circuit is bad.
As expected, the "always on" 6V filament supply is bad.
Input to regulator is 11VDC, output of regulator is a few mV.
No wonder the audio tube does not light up.
I'll have him replace the regulator input and output electrolytic capacitors to start with.
Maybe the regulator output cap is shorted. If not, then the TO-3 regulator will have to be replaced.
Wonder if the regulator plugs in, or is soldered. I never liked working on those.
Oddly, the output cap is a film pp type. Maybe it isn't bad after all.
The 7806 regulator is common failure point. And it is a b*tch to remove. The whole board has to come out.
But check that there is AC voltage getting to the circuit first, as the transformer is another weak point...
But check that there is AC voltage getting to the circuit first, as the transformer is another weak point...
There was correct DC voltage at the regulator input.
He found some of the correct regulators, so he will be replacing the regulator and the capacitors, and hopefully then it will work.
The filament regulator circuit is powered ON continuously, unless you pull the plug. Kinda unnecessary.
He found some of the correct regulators, so he will be replacing the regulator and the capacitors, and hopefully then it will work.
The filament regulator circuit is powered ON continuously, unless you pull the plug. Kinda unnecessary.