Building a Reactive Load Box/Line Out

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Building a Reactive Load Box/Line Out

Postby Che Guitarra » Sun Aug 06, 2017 7:02 pm

Schematic:

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Build Progression:

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Re: Building a Reactive Load Box/Line Out

Postby LLL » Fri Aug 25, 2017 5:41 am

Nice!
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Re: Building a Reactive Load Box/Line Out

Postby Che Guitarra » Mon Sep 11, 2017 6:45 pm

Updated schematic based on first test/recordings:

Image


Clip:

http://www.tonefinder.com/files/841504978622-wiygn2.mp3
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Re: Building a Reactive Load Box/Line Out

Postby Che Guitarra » Sun Sep 17, 2017 2:16 pm

First build - finished project pics:

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After initial silent recording test with this build, couple of issues cropped up.

1. Dummy load resistors and heat sink was getting way too hot. This design is rated for 16 Ohms @ 300W peak power. Obviously getting more than that out of my 100W tube amp.

2. Small polarized reactive capacitance network, that Randall Aiken detailed in the original build thread proved to be wholly inadequate. Capacitors are actually getting warm to the touch after playing for a few minutes. Also getting high-pitched whistle at times. Taken together, this means those 4 caps are about to explode.

Redesign and rebuild underway.
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Re: Building a Reactive Load Box/Line Out

Postby Che Guitarra » Sun Sep 17, 2017 2:28 pm

Rebuild progress pics:

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Dummy load resistors upgraded to 250W rated components.

Two 33 Ohm 250W wire-wound, chassis-mount power resistors wired in parallel yields a 16.5 Ohm 500W resistive load.

As you can see, these require using a Dremel equipped with cut-off wheel to shorten the binding posts in order to fit inside the project case.

Also, reactive inductor has got to be bolted on askew in order to fit inside case.
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Re: Building a Reactive Load Box/Line Out

Postby Che Guitarra » Sun Sep 17, 2017 2:31 pm

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Reactive capacitor upgraded to Solen 200uF 400VDC high-ripple current audio crossover grade cap.

Fan power supply will now be a wall-wart type that is outside of the case.
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Re: Building a Reactive Load Box/Line Out

Postby Che Guitarra » Tue Sep 26, 2017 3:23 am

Completed build - Reactive Load Box/Line out v2.0

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Re: Building a Reactive Load Box/Line Out

Postby Che Guitarra » Sat Sep 30, 2017 5:41 pm

Sound clips recorded using new reactive load build.

Silent recording.

100W Plexi, master on 10 :shock:

Reaper DAW

NadIR speaker/mic impulse responses.

Sunset Studio reverb IR

:arrow: http://www.tonefinder.com/files/301506461552-GABFGTSLOL.mp3


:arrow: http://www.tonefinder.com/files/361506457895-stcisoguitar.mp3


:arrow: http://www.tonefinder.com/files/941506485499-GABFGTSLOL04.mp3


:arrow: http://www.tonefinder.com/files/741506515116-whiteguilt.mp3


:lol:
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