Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on June 17, 2024, 09:50:50 pm

Title: how do you add an input jack to the rear?
Post by: joesatch on June 17, 2024, 09:50:50 pm

single input jack on front. the kind that has a 1m resistor from tip to ground and shunts the tip to ground when there's no jack inserted. how do i add a second input jack to the rear of the unit with the ability to use either one?

Title: Re: how do you add an input jack to the rear?
Post by: tubeswell on June 17, 2024, 11:07:02 pm

Very carefully ;-)

Title: Re: how do you add an input jack to the rear?
Post by: Latole on June 18, 2024, 03:02:50 am

You may need (?) a shielded wire too if the rear jack is too far from the input tube

Here's how to connect the 2 jacks, even if they're far apart

Title: Re: how do you add an input jack to the rear?
Post by: pdf64 on June 18, 2024, 05:07:23 am

Quote from: Latole on June 18, 2024, 03:02:50 am

You may need (?) a shielded wire too if the rear jack is too far from the input tube

Here's how to connect the 2 jacks, even if they're far apart

That creates a high and a low input.

If the goal is for neither input to have any signal reduction and for the input to be muted if neither input socket is used, and only one of the inputs to be in use at any time, then as I see it, special jack sockets with isolated switches will be required.
It will tend to make for a rather convoluted input circuit wiring arrangement.

Title: Re: how do you add an input jack to the rear?
Post by: Latole on June 19, 2024, 03:33:28 am

 
 
That creates a high and a low input.


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You are right.