Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on March 21, 2018, 04:34:08 pm

Title: Parallel input - Wich is the better connection to the input jack ?
Post by: kagliostro on March 21, 2018, 04:34:08 pm

The schematic is this

(https://i.imgur.com/0shaXbg.jpg)

Wich is the better connection way between two tubes and the input jack ?

Only a shielded cable from the input till the first tube then from the first tube to the second tube like in the following layout

or it will be better to have a separated shielded cable (two cables) from input to each single tube ?

(https://i.imgur.com/1XiMVH9.jpg)

Thanks

Franco

Title: Re: Parallel input - Wich is the better connection to the input jack ?
Post by: sluckey on March 21, 2018, 04:48:54 pm

I would mount a single standoff turret between the two preamp sockets. Run a single coax from the input jacks to this turret. Connect the two resistors to this single turret and connect the other end of the two resistors to each tube grid. Think about a "Y", where the coax is the bottom leg and the two resistors are the top legs and the junction is the turret.

Title: Re: Parallel input - Wich is the better connection to the input jack ?
Post by: kagliostro on March 21, 2018, 05:01:06 pm

Cool, nice idea

Thanks Steve

Franco