Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: bergurbrag on April 27, 2023, 06:24:59 AM

Title: Mainline -Voltage test
Post by: bergurbrag on April 27, 2023, 06:24:59 AM

Dear Mr. Brikeland

Can you please help me with the following:

I live in a country with 230 V AC. Iceland.
These are the numbers from page 88 from the Mainline manual
Can I use these numbers and if not what are the right ones ?

+275VDC on the Power Supply Board: 275V DC
+6.3vDC on the Power Supply Board : 55-65 V
-6.3vDC on the Power Supply Board: 50-60V
IA on the A side CAS Board : 275V
lA on the B side C4S Board: 275V
Breg Regulator Board (both sides): 220V
-reg Regulator Board (both sides) : 0V
Kreg Regulator Board (both sides) : 8-12V

Also Biasing from page 89:

Can use these numbers and if not then what are the right ones?

Leave the black probe attached to terminal 7. Read the voltage at terminal 20. Adjust the B side trim potentiometer until your meter reads 145VDC. Move your red probe to terminal 30. Adjust the A side trim potentiometer until your meter reads 145VDC

With Regards,

Bergur Bragason

Title: Re: Mainline -Voltage test
Post by: Paul Birkeland on April 27, 2023, 01:30:19 PM

If you set the power transformer for 230V AC (which is covered in the manual), then that accounts for the different mains voltage in your country.

Title: Re: Mainline -Voltage test
Post by: bergurbrag on April 27, 2023, 10:13:46 PM

 Thank you !
I will post some other questions. Should I start another conversation or should I post it here?

Title: Re: Mainline -Voltage test
Post by: Paul Birkeland on April 28, 2023, 06:03:59 AM

You can just post them here.