line out for peavey tnt 100

[kprather57]

I'm new to forum and very much a novice - is there an easy mod to create a line out on an old peavey tnt 100?

[Enzo]

Which one do you have?

The old original one from 1974 has a small transformer on the power amp circuit board and a handful of small transistors on the preamp, while the later one from 1979 lacks the small transformer and uses three op amp ICs in the preamp.

The 1979 already has a line out jack.

DO you want just a line out or did you want to kill the speaker too?

The easiest thing to do is tap off the speaker output. SOmething like a 10k resistor from hot running to a pot of something like 2k-5k of there abouts. A little experimantation could pin down th values. Wiper of the pot feeds the line out.

You could also run a tap from the master volume control.

[drewl]

If you find schems, some of the models had a "booster amp" output jack which is the line out Enzo described.
You can just look at how Peavey did it on other amps and copy their line output circuit.

[Enzo]

Good idea.

I just looked up a few and they tapped off the speaker line with a 22k resistor and then a 1000 ohm to ground from there - the "booster out" was then taken acoss that 1k resistor.

This line out was meant to go to an external power amp - a booster amp.

DEpending on how hot the amp is and how loud you play it, you could start with those numbers and experiment with them. The ratio of the large one to the small determines the level more or less, and the smaller one can become a pot. The value of the pot would determine the range of adjustment. Or just use the two resistors like PV did.