Bottlehead Forum

General Category => Technical topics => Topic started by: Hmmmmm on January 06, 2025, 02:55:55 PM

Title: Bottlehead crack 1.1 Left channel sounds slightly muffled
Post by: Hmmmmm on January 06, 2025, 02:55:55 PM

I had a tube going bad lost vacuum and started having a intermittent muffled Left channel and so I threw a Svetlana 6as7 Coke bottle tube in it now the Left channel is constantly muffled I've done a sloppy EQ job and it sounds close to the right channel now.

Title: Re: Bottlehead crack 1.1 Left channel sounds slightly muffled
Post by: Paul Birkeland on January 06, 2025, 03:08:41 PM

What are your voltages on terminals 1-10?

Title: Bottlehead crack 1.1 Left channel sounds slightly muffled
Post by: Hmmmmm on January 06, 2025, 03:46:38 PM

1, 78.9vdc
2, 177.8
3, 0
4, 177.7
5, 84.5

6, 0
7, 105.3
8, 0
9, 110.6
10, 0

I do have the speed ball upgrade

Title: Re: Bottlehead crack 1.1 Left channel sounds slightly muffled
Post by: Paul Birkeland on January 06, 2025, 07:17:25 PM

I would throw some cheap headphones and poke around the amp while it's playing with a wooden chopstick to see if you can change what you're hearing by poking at various parts.  I suspect you have a flaky solder joint that's acting up somewhere causing something close to a signal dropout.

Title: Re: Bottlehead crack 1.1 Left channel sounds slightly muffled
Post by: Hmmmmm on February 01, 2025, 10:11:10 AM

Sorry for being so slow I've been procrastinating I poked around for a while and it stayed the same no clunks no clicks no change although the more I use it the better it gets maybe it's the new tube idk