Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: LouisQ on December 21, 2021, 10:58:31 AM

Title: Help Needed for 0.1μF 100V Soldering on Mainline [resolved]
Post by: LouisQ on December 21, 2021, 10:58:31 AM

Hello,

I am not sure I made the correct soldering.

On page 71&72 of the Mainline manual it says (ref. picture #1 att.) :

-"Bend the leads of a 0.1μF 100V capacitor close to the body of the capacitor. Attach and solder the leads to C4 and C5."

-"Bend the leads of a 0.1μF 100V capacitor close to the body of the capacitor. Attach and solder the leads to A4 and A5."

On both instances I soldered the two leads of the 0.1μF 100V to C4 and C5 / A4 and A5 respectively (ref. pictures #2, #3, #4, #5 #6 and #7 att.).

Was soldering all of them together the way to proceed?

Thank you in advance for the help.


Louis

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: Paul Birkeland on December 21, 2021, 01:16:00 PM

Looks OK to me. You can power up the amp with the tubes in to be sure they glow if you'd like.

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: LouisQ on December 21, 2021, 01:42:14 PM

Thanks Paul,
I will try the tubes.
Much appreciated :)

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: LouisQ on January 06, 2022, 12:08:09 PM

Hey Paul,
A bit late to the party, but happy new year!
Just to inform you that my Mainline is completed and working properly: it sounds awesome!!
Quick question, there’s no noticeable gain/volume when I switch the impedance switch (HI/low), is that normal?
Thanks so much,

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: Paul Birkeland on January 06, 2022, 12:39:35 PM

There should be a change in volume, but it's not enormous.

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: LouisQ on January 06, 2022, 01:41:02 PM

There is no change in volume.
I tried with different headphones (HD800s, Focal Clear).
Would you have any thoughts?

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: Paul Birkeland on January 06, 2022, 03:35:16 PM

Can your multimeter resolve low AC voltages?  You can play a 60Hz tone into your Mainline and we can check that the output is changing a bit when you flip the switch by using your meter.

Title: Re: Help Needed for 0.1μF 100V Soldering on Mainline
Post by: LouisQ on January 08, 2022, 02:36:41 PM

Hi Paul,

Indeed there's a slight difference, all good thank you.

Have a nice weekend :)