I had too much heat at reflector,it was 10A TO220.
So I changed into 35A bridge reflector.
Then I could bias correctly.
I turn it up and start listening music with bulb tester.
Ok no problem,then without bulb tester it sounds better.
But few seconds later, a smoke came out from R2 0.47ohm left channel.and R2 turned into black.
I'm getting better but still have problem.
So I changed into 35A bridge reflector.
Then I could bias correctly.
I turn it up and start listening music with bulb tester.
Ok no problem,then without bulb tester it sounds better.
But few seconds later, a smoke came out from R2 0.47ohm left channel.and R2 turned into black.
I'm getting better but still have problem.
Did you turn down the bias pots, then re-bias after removing the bulb tester? You must do this and let it settle (get up to temprature)
Sounds a lot of work, but it is vital to do this for long term stability.
Hum noticed Please help
My F6 is working. It sounds beautiful. To my years, the highs sound silkier than my Tube power amp. Really impressed.
Per 6L6 recomm
Initially, I was concerned how F6 would drive by 16 ohm altecs. Bias set at .575v, no issue... Altec is behaving well. Should I try to raise it little high?
And, B1 Nutube matches well with F6. These babies are here to stay.
One issue tho. I hear hum, audible from 8 to 10 feet away. I don't have a scope but it feels like the hum is well above 60hz. The power trans is relatively shilded well and it's far away from the input trans. So I wandering if the followings are the possible cause.
1. PSU
2. Pre
3. Cable
4. at 99db, my altecs are just too sensitive
any other lead?
Thanks
My F6 is working. It sounds beautiful. To my years, the highs sound silkier than my Tube power amp. Really impressed.
Per 6L6 recomm
Initially, I was concerned how F6 would drive by 16 ohm altecs. Bias set at .575v, no issue... Altec is behaving well. Should I try to raise it little high?
And, B1 Nutube matches well with F6. These babies are here to stay.
One issue tho. I hear hum, audible from 8 to 10 feet away. I don't have a scope but it feels like the hum is well above 60hz. The power trans is relatively shilded well and it's far away from the input trans. So I wandering if the followings are the possible cause.
1. PSU
2. Pre
3. Cable
4. at 99db, my altecs are just too sensitive
any other lead?
Thanks
Can't sleep till you confirm this.
1) When you take this measurement are the speakers connected and do you hear the hum?
2) If you touch probes together for zero measurement, what measurement do you get?
If your multimeter is accurate, 33uV is very good actually. I wouldn't expect to hear hum that loud.
Are you sure it wasn't 0.33mV?