Hitachi HA-250 Amp no output

[Mooly]

Normal dissipation will be very low indeed. At full output (sine wave, dummy load and all that) you might pull 50 to 100 milliamps through it which would be under 0.5 watt, plus it would be way less than that as an average...

So 0.5 watt covers every eventuality. Edit... 0.25 watt I'm sure will also be fine for any music program at any volume level you use.

 

[woodyp]

Thank you! The bias was indeed turned to maximum. I set them to get about 5mV on R720 (0.22ohm) and the bulb doesn't glow now.

 

[woodyp]

And with the bias at that level , even on the DBT ,the +- 30 V measure where they should.

 

[Mooly]

That's good