Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: tagomago on August 20, 2019, 07:27:14 AM

Title: Right channel slightly lower volume
Post by: tagomago on August 20, 2019, 07:27:14 AM

What could be the reason my Cracks right channel is very slightly lower volume than the left channel? It sounds clear but I always have the feeling there's more energy in the left channel.
I don't experience this when using the headphones in other sources.

Title: Re: Right channel slightly lower volume
Post by: Paul Birkeland on August 20, 2019, 09:58:51 AM

How are your voltages?

Title: Re: Right channel slightly lower volume
Post by: tagomago on September 30, 2019, 10:23:48 AM

Finally got around to measure it. All in VDC
It is with the speedball:

Small board:
OA: 84.2
OB: 83.3
IA: 190.7
IB: 190.8

Big board:
B+: 190.6
G: 0.0
OA: 116.7
OB: 116.5

Title: Re: Right channel slightly lower volume
Post by: Paul Birkeland on September 30, 2019, 12:34:44 PM

How far up are you able to turn the pot on the amp?  In the FAQ on the Crack board, there's a modification posted in case what you're dealing with is just a bit of channel imbalance in the volume pot.  They can be a bit imbalanced at very low levels.

Title: Re: Right channel slightly lower volume
Post by: tagomago on September 30, 2019, 10:02:15 PM

The volume pot does not affect this. I can turn it all the way up and it is the same effect over the whole range.
I am testing with MONO recordings (from PC) and it's always there. Also, when I switch the input chords. It is always a bit louder in the left channel.

Title: Re: Right channel slightly lower volume
Post by: Paul Birkeland on October 01, 2019, 04:15:51 AM

Well, this could be from a flaky solder joint in one channel or a tube that isn't well balanced.  Usually I would expect a cold solder joint to produce an issue like this.