muffy1975

Larry Comara Fat Box
« on: June 21, 2018, 12:04:42 PM »
HI,

does anyone know much about this bass d.i other than what i found here :-

https://www.gearslutz.com/board/so-much-gear-so-little-time/47750-has-anyone-heard-quot-fat-box-quot.html

post 12.

I wonder how it's made?

I have searched the forum and there's no mention of it anywhere.

Michael


Re: Larry Comara Fat Box
« Reply #1 on: June 22, 2018, 06:08:34 AM »
looks like a simple passive transformer DI. just put a transfo in box and wire it up :) check the DIYRE kit

Jarno

Re: Larry Comara Fat Box
« Reply #2 on: June 22, 2018, 07:45:20 AM »
there appears to be a 9v battery in there as well, so it is probably more than just a transformer.
FET buffer a la Ray Marston and transformer?

muffy1975

Re: Larry Comara Fat Box
« Reply #3 on: June 30, 2018, 12:04:36 PM »
Hey Goys,

It's transformer less and does not use fets. and the bass sound on rumours is amazing and UNLIKE later albums.

This unit needs an explanation as it was used by so so many artists back in the day.

Michael

muffy1975

Re: Larry Comara Fat Box
« Reply #4 on: June 30, 2018, 12:06:08 PM »
Could it be a 2520 opamp? Just running on a +9V battery?

Michael

MrG

Re: Larry Comara Fat Box
« Reply #5 on: October 27, 2018, 09:32:27 PM »
I’m very interested in this design as well. Any takers?


Mark Galup | Producer/Mixer/Mastering Engineer
ReelRecording.com
MarkGalup.com

ruffrecords

Re: Larry Comara Fat Box
« Reply #6 on: October 28, 2018, 03:52:55 AM »
Looking at the GS thread the active electronics are potted. The designer appears to be still around but is not about to reveal the schematic. Pity really. Potting is a double edged sword. It was a common way of protecting IPR in those days , However, any electrolytic caps in there are likely on their way out and impossible to replace rendering the unit useless, especially when someone accidentally connects phantom power to it.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

MrG

Re: Larry Comara Fat Box
« Reply #7 on: October 29, 2018, 03:48:32 AM »
Yep, definitely feels a little tragic.

Just to get some sort of discussion going, what are all of the “known” methods of non-tube di boxes?

-passive transformer-based
-active fet-based
-active silicon transistor-based

I am certain I am missing tons of info, so please take this apart.

Thanks,
Mark

Mark Galup | Producer/Mixer/Mastering Engineer
ReelRecording.com
MarkGalup.com


 

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