Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: G._Hoffman on May 03, 2024, 06:59:56 pm

Title: Screen tap on Transformer?
Post by: G._Hoffman on May 03, 2024, 06:59:56 pm

I am looking at some toroidal output transformers, and some of them have screen taps.  What is that? 

Title: Re: Screen tap on Transformer?
Post by: uki on May 03, 2024, 07:55:49 pm

Quote from: G._Hoffman on May 03, 2024, 06:59:56 pm

I am looking at some toroidal output transformers, and some of them have screen taps.  What is that?

That is a ultralinear transformer.

Title: Re: Screen tap on Transformer?
Post by: sluckey on May 03, 2024, 07:56:13 pm

Screen taps are for ultralinear (UL) amps. Mostly hifi stuff. There are a few guitar amps that are UL. Usually clean sounding amps. I have two UL amps...

     https://sluckeyamps.com/sunn/sunn_sceptre_1971.pdf
     https://sluckeyamps.com/magnatone/Magnatone_M10A.pdf

You can ignore the screen taps and just insulate the ends of the leads.

Title: Re: Screen tap on Transformer?
Post by: G._Hoffman on May 04, 2024, 12:19:58 am

Quote from: sluckey on May 03, 2024, 07:56:13 pm

Screen taps are for ultralinear (UL) amps. Mostly hifi stuff. There are a few guitar amps that are UL. Usually clean sounding amps. I have two UL amps...

     https://sluckeyamps.com/sunn/sunn_sceptre_1971.pdf (https://sluckeyamps.com/sunn/sunn_sceptre_1971.pdf)
     https://sluckeyamps.com/magnatone/Magnatone_M10A.pdf (https://sluckeyamps.com/magnatone/Magnatone_M10A.pdf)

You can ignore the screen taps and just insulate the ends of the leads.

Thanks!  I'm not actually planing on using it, I was just looking at it and hadn't seen it before.  I figure I should use up the transformers I have in the house before I buy anything more, particularly since they work for the amp I am thinking of building.