Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: truong_guitar on August 12, 2020, 04:13:24 AM

Title: Replace output transformer by ll7401
Post by: truong_guitar on August 12, 2020, 04:13:24 AM

Hi there,

Has anyone tried to replace the output transformer (OT3) with the lundahl ll7401?
I'm planning to replace it. I don't know how the sound improves

Title: Re: Replace output transformer by ll7401
Post by: Paul Birkeland on August 12, 2020, 07:06:22 AM

A 1:1 output transformer is going to make the Mainline sound much, much worse.

Title: Re: Replace output transformer by ll7401
Post by: truong_guitar on August 13, 2020, 04:40:04 AM

Thanks Paul,

Would you like to give me ratio output transformer?

Title: Re: Replace output transformer by ll7401
Post by: Paul Birkeland on August 13, 2020, 06:42:39 AM

I would use what we provide in the kit.  I have not run into any other suitable output transformer that will drop into the Mainline circuit and work just as the originals.

Title: Re: Replace output transformer by ll7401
Post by: pfontana on January 13, 2022, 06:20:39 PM

Hi,
Just curious if you ever changed out your transformer?
What were the results?
Philip

Title: Re: Replace output transformer by ll7401
Post by: Doc B. on January 14, 2022, 05:48:44 AM

This is a bad idea. I don't understand what the original reason for changing it was. The OT-3 is designed specifically for this application.