Bottlehead Forum

Bottlehead Kits => Eros Phono => Topic started by: Jeroen on June 08, 2015, 10:45:19 AM

Title: shunt regulator slow start
Post by: Jeroen on June 08, 2015, 10:45:19 AM

When testing the voltage on D1  I put the power on and after a couple of seconds all 4 LED's on the shunt regulator lit up. Then I put the power off. When putting the power on again for measuring the voltage on D6 it took 5 minutes before all 4 LED's lit up.  I did a couple of more tests and every time it took 5 minutes before the LED's starting to lit up (and the voltage on D1 and 6 drops).

Is this something I have to worry about?

Voltages on D1 and D6 are both 222 volts and hardly fluctuate.

Best Regards,

Jeroen

Title: Re: shunt regulator slow start
Post by: Paul Birkeland on June 08, 2015, 11:04:35 AM

Quote from: Jeroen on June 08, 2015, 10:45:19 AM

Voltages on D1 and D6 are both 222 volts and hardly fluctuate.

This is the important part.  The other timing issues are the 12BH7 warming up.

-PB

Title: Re: shunt regulator slow start
Post by: Paul Joppa on June 08, 2015, 11:35:33 AM

Five minutes is very slow, though. What is your power line (mains) voltage?

Title: Re: shunt regulator slow start
Post by: Jeroen on June 08, 2015, 06:30:44 PM

Line voltage is about 227 volt at the moment. 

While typing this post I powered the amp on and within 40 sec. all 4 Led's light up.

I think the line voltage was lower the moment I did the first measurements..