Vintage Toshiba 330 power amp problem, possible repair?

[rewa]

how what? the voltage at the outputs ... and are you innocent that plus and minus do not coincide?

 

[Mooly]

Do you mean DC offset?

The voltage at the speaker terminals?

If you do then 0.05 volts is perfectly normal for that amplifier... all good

 

[rewa]

I wanted to know if this is a plus on a minus and a minus on a luce ... why is that?

 

[rewa]

reverse polarity there ... that interests me

 

[rewa]

mules tell me pliz)

 

[Mooly]

Offset polarity can be in either direction. It is perfectly OK

 

[rewa]

Thank you, my friend, I connect plus to minus and plays with good soft bass ...

 

[rewa]

guys need a hint on this amplifier .. changed the resistors r41 and r42 since my relatives swam ... set it to 110 ohms ... or, all the same, set it to 100 as according to the scheme?

 

[Mooly]

Not understanding you

R41 and R42 drive the meters.

 

[rewa]

muly hello ... i have sc-335

 

[rewa]

so google translate translates a little guess if something is not clear ...

 

[Mooly]

muly hello ... i have sc-335

I would need to see the circuit in that case to see what the resistors do but if they are fixed resistors then I would think going from 100 to 110 or 110 to 100 should not cause any big problems.

 

[rewa]

An externally hosted image should be here but it was not working when we last tested it.

 

[Mooly]

Either 100 or 110 will be fine. Just be sure to set the bias current correctly. Higher value resistor will give higher bias current.

 

[rewa]

Mouli, thank you, I understood that the main thing is to regulate the quiescent current ... if it is regulated, then the resistor is suitable ... as I understand it ...

 

[Mooly]

That is right. The resistor is in parallel with the preset resistor and so you have all the adjustment range you need.

The difference it makes is this.

With a 100 ohm you have a total adjustment range of zero to 75 ohms.

With a 110 ohm you have a total adjustment range of zero to 80 ohms.