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Discussion Starter #1 (Edited)
Product Brand & Model:

Zapco C2K 4.0 Fully Modified by Matt Roberts

Condition of all items:

Excellent Condition maybe near mint...I'd give it a 9.5/10

Total Price: :

$1400

Shipping Terms: :

SHIPPED!

Pictures: - Unless you are a Upgraded member, or your last 10 iTrader feedbacks are positive, you must post a picture of the exact item you are selling.



















More Pictures can be found here on this link provided by Matt...

https://picasaweb.google.com/mattroberts73/Zapco40?authkey=Gv1sRgCLLsm67K2sLINg

Additional info:


The amps mods and upgrades are:

*New output transistors (Sanken) with much higher switching rate were hand matched on a curve tracer

The Class A bias was quadrupled (4X) from the factory specs

*The heart of the upgrade is the Pure Class A input stage, fully discrete and hand built. All the new bipolar transistors have all been hand matched to exact perfect pairs. This input stage replaces all opamp based xovers and gain stages, switches, potentiometers, ect.

*Power supply capacitors were increased in size. Pre filter caps were increased from 3300uf to 4700uf. The Main filter caps were increased from 10,000uf to 12,000uf ea. 1uf Polypropolyne caps were added to the power supply for high frequency filtering. Nichicon NE and Muse, Panasonic TSUP, and Elne Silmic2's were used along with Dynamicaps.

*Alps audio pots were used for gain control. The Crossovers and such were all removed. The audio signal has a shorter signal path and is so much more pure or unmolested.

*The cooling system was redone to sustain all the other mods.

This is what Matt said when he was testing the amp: "It's sounding awesome and getting loud as ****!!! This is the baddest Zapco amp to date!"



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188 Posts
Discussion Starter #6
BUY ME! =) Dont miss your chance on this rare and one of a kind amp!

The TRT Dynamicaps used in the amp was requested by me personally...I bought it authorized and sent to Matt. One of the best Polypropylene Film Capacitors out there.

Here is a revew by Mike Elliot of Alta Vista/Aria Audio.

A good-sounding capacitor is essential!
 

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Discussion Starter #9
I was never aware of different stage upgrades...The upgrades on this amp was pretty extensive...Almost every internal parts were upgraded...
 

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Seen a thread dating back to 2008 where the owner UG'd his DSP6, 4.0 & 2.0 to High Class A Bias. After reading the thread myself, I held onto my setup ( identical components ) in hopes to someday ship em to Modesto too. Unfortunately too lazy to pack and send em to Matt. They're just sitting in my attic collecting dust ( Version 1's - Black with Gold Badging from 2001-2002 production line BNIB ).
 

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Discussion Starter #14
Not high jackin your thread or anything, but did Matt Roberts provide you with a New Birth Sheet for this watt puppy?
No he didnt...

Nice amp Mr Randy - Seems you always have the good stuff for sale.


GWLS

Thanks! Yeah I have been spending too much money...Im addicted to amps lol...I can never make up my mind on what to keep...But I think this time for sure I have made up my mind =)
 

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783 Posts
Very nice indeed! I also have one of these waiting to be installed, can't wait! Free bump for ya!
 

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Nice...you'll love it.

I got a Matt R Class A line driver if you need it.[/QUOTE]

I have one on the way! Thanks though!

Sent from my DROIDX using Tapatalk
 
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