Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on August 03, 2023, 08:37:57 am

Title: SVT with a 600 Ohm input
Post by: pbman1953 on August 03, 2023, 08:37:57 am

I came across this vintage SVT with a 600 ohm input. Looks very rare to have that. What would be the need for one?


Thanks

Title: Re: SVT with a 600 Ohm input
Post by: sluckey on August 03, 2023, 09:07:57 am

600Ω is an industry standard impedance for many audio circuits, especially those that may have to travel long distances such as telco, air traffic control communications, etc. You can plug into that jack and listen to the president's private phone calls.

Title: Re: SVT with a 600 Ohm input
Post by: HotBluePlates on August 05, 2023, 08:59:47 am

Quote from: sluckey on August 03, 2023, 09:07:57 am

You can plug into that jack and listen to the president's private phone calls.

 :laugh:          :l2:

Title: Re: SVT with a 600 Ohm input
Post by: PRR on August 05, 2023, 12:23:12 pm

But seriously, folks: Vocal mixer has a line output which you feed to a Power Amp Line Input.

It may just be a resistor pad into the guitar jack switch finger.

Is it really 600 Ohms? Who cares? Any mixer above the Tandy $13.98 job won't care.

Title: Re: SVT with a 600 Ohm input
Post by: pbman1953 on August 05, 2023, 05:10:09 pm

Quote from: PRR on August 05, 2023, 12:23:12 pm

But seriously, folks: Vocal mixer has a line output which you feed to a Power Amp Line Input.

It may just be a resistor pad into the guitar jack switch finger.

Is it really 600 Ohms? Who cares? Any mixer above the Tandy $13.98 job won't care.

Thanks for helping me understand! Possibly an input for high out put basses.