Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Backwoods Joe on December 31, 2025, 07:38:11 pm

Title: post phase inverter Master Volume for a paraphase phase inverter
Post by: Backwoods Joe on December 31, 2025, 07:38:11 pm

Does this make sense? A Master volume for an amp with a paraphase phase inverter. Anybody built an amp with this? Tips, advice, Schematics welcome! THX joe

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: kagliostro on January 01, 2026, 03:46:28 am

Interesting question

Exactly which kind of Paraphase ?

Franco

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: jjasilli on January 02, 2026, 08:07:27 pm

There's a psionic audio youtube video on this.  Just watched it today or yesterday.  If you can't find it post again or pm me.

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: SEL49 on January 02, 2026, 08:34:06 pm

Quote from: jjasilli on January 02, 2026, 08:07:27 pm

There's a psionic audio youtube video on this.  Just watched it today or yesterday.  If you can't find it post again or pm me.

It's very easy to find a video you just watched today or yesterday. Just go back to YouTube and click on the YOU section and then History. All the videos you have viewed will be listed in chronical order. Then click on the video of interest. Now copy the URL in the address bar and then paste into a message on the board.

All this assumes you are logged into your YouTube account.

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: AlNewman on January 02, 2026, 10:32:50 pm

Would it be like putting a variable resistor between the 2 grids of the power tubes?

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: kagliostro on January 03, 2026, 02:40:41 am

I never seen a PPIMV after a Paraphase so I asked to ChatGPT, the answer Is that It depends on the kind of Pharahase and however not a good match

Franco

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: roarshock on January 03, 2026, 02:06:03 pm

I've never done it, but I'm considering it currently.  What would the impacts of a simple volume control (signal in the 1 lug, out the 2 lug and 3 lug to ground) connected to the first capacitor from the plate of the first phase inverter gain stage and before the mixing resistor be?

Title: Re: post phase inverter Master Volume for a paraphase phase inverter
Post by: jjasilli on January 03, 2026, 04:32:34 pm

&t=79s

Balance in a Paraphase PI | Five Watt World GA-40 Pt 4:Psionic Audio