Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mresistor on November 02, 2021, 09:21:48 pm

Title: 5E8A question
Post by: mresistor on November 02, 2021, 09:21:48 pm

Hi..  does the 5E8A have a paraphase phase inverter?   

Title: Re: 5E8A question
Post by: sluckey on November 02, 2021, 09:35:59 pm

no

Title: Re: 5E8A question
Post by: mresistor on November 02, 2021, 09:59:57 pm

  It looks like a cathodyne.   One signal taken of the plate and inverted signal off the cathode.  It's just drawn funky to me.

Title: Re: 5E8A question
Post by: Willabe on November 02, 2021, 10:35:10 pm

Most of the 5E series have the cathodyne/split load PI. The 5F series went to the LTPI.

https://el34world.com/charts/Schematics/files/Fender/Fender_twin_5e8a_schem.pdf

Title: Re: 5E8A question
Post by: sluckey on November 02, 2021, 10:38:19 pm

Looks just like most ac coupled cathodynes, including princeton reverb. What seems odd to you?

Title: Re: 5E8A question
Post by: mresistor on November 02, 2021, 11:48:23 pm

I don't know why but at first it looked odd,,  after a closer look it looks like a cathodyne.  Thanks.