Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on January 04, 2023, 08:53:51 pm

Title: PT has two sets of Primary inputs?
Post by: joesatch on January 04, 2023, 08:53:51 pm

This PT as two sets of AC inputs. Which ones do i use?  pin 1-2 or pin 3-4 ?.  Can i tie pin 1-3 together and pin 2-4 together? i dont get this.

Title: Re: PT has two sets of Primary inputs?
Post by: SILVERGUN on January 04, 2023, 09:14:40 pm

Quote from: joesatch on January 04, 2023, 08:53:51 pm

This PT as two sets of AC inputs. Which ones do i use?  pin 1-2 or pin 3-4 ?.  Can i tie pin 1-3 together and pin 2-4 together? i dont get this.

For 120Vac input

Jumper 1 and 3 and hookup one primary input leg
Jumper 2 and 4 and hookup the other leg


Like this

Title: Re: PT has two sets of Primary inputs?
Post by: SILVERGUN on January 04, 2023, 09:21:25 pm

Ignore the "series winding" connection note at the bottom of my screenshot that was meant for the next picture.
 Your instructions are to connect the windings in parallel


Here is the correctly labeled screenshot

Title: Re: PT has two sets of Primary inputs?
Post by: joesatch on January 04, 2023, 09:29:35 pm

Thanks! :icon_biggrin: