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lazarate54 7th January 2020 12:44 AM

Converting Speaker Output Jack to DI
 
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Hey there guys! New to the forums here! I have a project/experiment on my bench, something I’ve never done before but that I have seen done.

I have an old Voice of Music 8810/166a amp that I’m trying to mod. Basically I’m trying to see how would I convert the speaker output jack to a DI output. I have a general idea of how I would do it but I’m not 100% sure how to do it. If that makes any sense. I’ll post a schematic below.

tINY 7th January 2020 02:13 AM


That's an interesting way of biasing a 6v6.....

You are going to need a load (probably 8 ohms). Then, you'll need to adjust the level - maybe.

8 ohms on a 10W output puts you pretty close to professional (+4dBU) level.....




-tINY


lazarate54 7th January 2020 07:31 AM

Quote:

Originally Posted by tINY (Post 14431030)

That's an interesting way of biasing a 6v6.....

You are going to need a load (probably 8 ohms). Then, you'll need to adjust the level - maybe.

8 ohms on a 10W output puts you pretty close to professional (+4dBU) level.....




-tINY


Adjust level how?

tINY 7th January 2020 05:51 PM


Use a potentiometer if you need to drop the level. If you need to boost the level, you'll need a transformer or an active stage.



-tINY


lazarate54 7th January 2020 09:32 PM

Quote:

Originally Posted by tINY (Post 14432489)

Use a potentiometer if you need to drop the level. If you need to boost the level, you'll need a transformer or an active stage.



-tINY


So install 8w wirewound resistors on the positive and negative lines leading to the speakers output jack. And if needed install a potentiometer from the leads to the speaker jack to adjust the output. Is that correct?

tINY 7th January 2020 09:59 PM


install a single, 10w (or greater) 8ohm resistor across the 1/4" jack. Then, use the jack to connect to your input.

The resistor and the input of your pre-amp are in parallel. This is a single ended solution. If you need a balanced feed (XLR or TRS) then you'll need a passive DI box as well.

Or, you could buy this: https://www.radialeng.com/product/headload


See also -

https://www.premierguitar.com/articl...ors-and-reamps

https://carvinaudio.com/blogs/guitar...-can-and-can-t




-tINY