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Old 4th February 2013, 11:27 PM   #1
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Default F5 / Mezmerize Integrated

Hi all,

Here's my latest creation, the F5/Mezmerize integrated amp. I needed something to replace my old but trusty Denon 3802 HTR that would do justice to the Pearl 2 I built a year ago.

6L6 provided a ton of guidance as I worked my way through this four month plus project. I'm thrilled with the result -- it's like listening to my music collection for the first time all over again.

Thanks to DIY Audio for making these boards and case available, and to Nelson for the fantastic designs.

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Old 5th February 2013, 12:07 AM   #2
Salas is online now Salas  Greece
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Cool. For what speakers?
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Old 5th February 2013, 12:18 AM   #3
billyk is offline billyk  United States
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Very nice!
I built a baby integrated for my office with an Amp Camp and a B-1, built an ODAC into it as well. Fills my office with sweet noise for sure.
I have one of the original Mezmerize boards and love it, I am planning on using it with my F5 Turbo when I finish it, the F5 I mean.
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Old 5th February 2013, 12:46 AM   #4
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Cool. For what speakers?
Mirage OM-7s. Mitsubishi LT-30 with a SAE-1000e going into the Pearl 2
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Old 5th February 2013, 09:08 AM   #5
WalterW is offline WalterW  Netherlands
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Very nice !
How did you ground it? I see some cl60 thermistors in the edge?
What kind of potentiometer did you use?
I built a similar F5 without the B1, looks like yours. Will post some pictures also. Is it the 3U chassis also or is it the 4U?
The F5 sounds really good!
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Old 5th February 2013, 01:30 PM   #6
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Very nice !
How did you ground it? I see some cl60 thermistors in the edge?
What kind of potentiometer did you use?
I built a similar F5 without the B1, looks like yours. Will post some pictures also. Is it the 3U chassis also or is it the 4U?
The F5 sounds really good!
I put a #8 screw and locknut through the bottom, ground off the powder coat, and used star-ring terminals to connect safety earth from the PEM, the PS ground through a CL60, and the static shield from the small transformer.

The ground path goes from the Mezmerize signal ground, through both F5s, then to the PS ground, through the CL60, and to earth. The circuit ground on the Pearl 2 floats, so it also follows the same path to earth through the RCAs. It's dead quiet, with the Denon the Pearl was picking up extraneous noise.

I wired the big PS per the build guide with 2 CL60s on a terminal strip from Radio Shack.

The volume pot is an Alps RK27 off of ebay from Hong Kong.

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Old 5th February 2013, 01:46 PM   #7
Salas is online now Salas  Greece
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Is the temperature at the Mezmerize area acceptably low for long life to its electrolytics?
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Old 5th February 2013, 02:51 PM   #8
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Is the temperature at the Mezmerize area acceptably low for long life to its electrolytics?
Good question. I'll have to measure it once it's up to full temp, but I think it's OK. There is quite a bit of convection through the case, and the big heat sinks do a great job. I can hold my hand against them for several seconds before it gets uncomfortable. The heat sinks on the Mez mosfets aren't even warm.
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Old 5th February 2013, 05:05 PM   #9
Salas is online now Salas  Greece
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Here is what to roughly expect from elecrolytics and temperature:

"When you will pack it up in its final box measure the temperature on the electrolytics. Rule of thumb is you double half a quoted cap's spec sheet lifespan for each 10 degrees decrement from printed max temp on the cap's sleeve. Example: If you got a 2000 hours 85C electrochemical capacitor working in a 55C environment, then 85C-55C=30C i.e. 3 times 10 degrees less than its max. Half 2000 hours is 1000 hours. 1000*2*2*2=8000 hours. That is how long it will live if the manufacturer is accurate and reliable. "

Quoted from a post I did in the SSA thread once. Of particular interest to all Class A amps builders of course.
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Old 5th February 2013, 05:14 PM   #10
6L6 is offline 6L6  United States
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McQuaide -

Congratulations on a fantastic build!!

Everything looks great! I'm so happy that your project has turned out as good as it did!

Have you decided on adjusting the F5 feedback resistors to get a bit more gain? Or is everything working out well?
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