Monkeymatic NDS

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xtian
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Re: Monkeymatic NDS

Post by xtian » Wed Sep 16, 2015 12:23 am

Whulp, tried the lower slope resistor (with pot...all the way to 10R!) and didn't care for that change. Also tried the "classic" stack, also not impressed. Best mod is just change the tail from 10K to 27K. I'm sure a lot of this is dependent on what sounds good with the Celestion V-Type speaker, but this also sounds good with my 2x10 and 2x12 cabs.
I build and repair tube amps. http://amps.monkeymatic.com

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xtian
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Re: Monkeymatic NDS

Post by xtian » Fri Sep 25, 2015 10:24 pm

Grille installed with logo, and faceplate designed (photoshop comp attached).

Taking her out clubbing tomorrow night.
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I build and repair tube amps. http://amps.monkeymatic.com

Aaron
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Re: Monkeymatic NDS

Post by Aaron » Fri Sep 25, 2015 10:54 pm

Nice looking build.

Aaron

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xtian
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Re: Monkeymatic NDS

Post by xtian » Tue Oct 06, 2015 2:17 am

Finishing touch. Faceplate arrived from panelcraftinc.com.
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I build and repair tube amps. http://amps.monkeymatic.com

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JazzGuitarGimp
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Re: Monkeymatic NDS

Post by JazzGuitarGimp » Tue Oct 06, 2015 3:14 am

How did the maiden voyage go?
Lou Rossi Designs
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and Schematic Capture

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xtian
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Re: Monkeymatic NDS

Post by xtian » Tue Oct 06, 2015 3:46 am

Have played it twice at gigs now. Enjoying it very much. Reasonable weight, great sound.
I build and repair tube amps. http://amps.monkeymatic.com

pdf64
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Re: Monkeymatic NDS

Post by pdf64 » Tue Oct 06, 2015 2:23 pm

M Fowler wrote:That 150k slope resistor allows a lot mids I would decrease that for better tone
My take is that as the slope resistor value is increased, the bass and mid shelves will become more attenuated WRT the treble shelf.

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xtian
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Re: Monkeymatic NDS

Post by xtian » Tue Oct 06, 2015 3:55 pm

Thx, Pete!
I build and repair tube amps. http://amps.monkeymatic.com

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Structo
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Re: Monkeymatic NDS

Post by Structo » Wed Oct 07, 2015 5:32 pm

Did you use the zener back-bias circuit or a zener on the HT?
Tom

Don't let that smoke out!

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xtian
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Re: Monkeymatic NDS

Post by xtian » Wed Oct 07, 2015 5:35 pm

I used Aiken's MOSFET B+ reducer. I love it. I can make one from scratch is 30 minutes, with $5 in parts. Here's the MOSFET. I have documented the build elsewhere.
I build and repair tube amps. http://amps.monkeymatic.com

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Structo
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Re: Monkeymatic NDS

Post by Structo » Wed Oct 07, 2015 5:43 pm

Thanks Aaron.
Tom

Don't let that smoke out!

pdf64
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Re: Monkeymatic NDS

Post by pdf64 » Wed Oct 07, 2015 9:44 pm

190 watt dissipation - wow!

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xtian
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Re: Monkeymatic NDS

Post by xtian » Wed Oct 07, 2015 11:42 pm

pdf64 wrote:190 watt dissipation - wow!
For $3.79! Hope that provides a little margin for error. 8)
I build and repair tube amps. http://amps.monkeymatic.com

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JazzGuitarGimp
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Re: Monkeymatic NDS

Post by JazzGuitarGimp » Thu Oct 08, 2015 5:20 am

Yes, but for the device to actually dissipate 190 watts without burning up, it will need a WAY HUGE heatsink. :-)
Lou Rossi Designs
Printed Circuit Design & Layout,
and Schematic Capture

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xtian
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Re: Monkeymatic NDS

Post by xtian » Wed Nov 15, 2017 4:09 am

I opened this amp a couple of weeks ago and noticed (remembered!) it had an unused 5v winding, so I put in Lou's awesome reverb board and PSU, with some expert help from Lou finding the right insert point and mixing resistors.

reverb.jpg

Came out great! Depth and Tone controls are very useful, and the Depth goes from very short, like 0.75s, to cavernous.

Received the faceplate from indcom.graphics, so she's ready to find a human who loves her.

IMG_8729.jpg
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I build and repair tube amps. http://amps.monkeymatic.com

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