Remake of my DoZ almost completed [pics] - diyAudio
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Old 12th November 2006, 02:53 PM   #1
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Default Remake of my DoZ almost completed [pics]

So after much blood, sweat and tears my remade Death of Zen amplifier is now as good as finished. The old version didn't really deserve pictures to be posted here, but I think this one does . I am currently in the process of fine-tuning the quiscent current and voltage at the + of C3, so I haven't really listened to it yet. Anyway, first some specs:

The transformer is a 2x25V 250VA Amplimo toroid.

Filter caps per channel are:
- Sprague Powerlytic 37000, 25000 and 20000 uF electrolythics
- 4 paires of 4u7 uF tantalum caps
- 100 uF on the PCB (C5 in Rods circuit diagram)
- 1uF MKT on the PCB

Transistors for the stages are BC559, MJE15030 and MJL4281 respectively.

The output caps are 4700uF Black Gates (I hope they'll be worth their money ).

Heatsinks are two 100mm Fischer SK 56s, rated at 0.4K/W (one per channel).

I built my Doz as an integrated amp, using a passive preamp (6-input rotary switch and an Alps volume pot). I also included a soft-start, to prevent fuses from blowing .

Please tell me what you think!
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Old 12th November 2006, 02:57 PM   #2
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Another one.
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Old 12th November 2006, 03:00 PM   #3
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Another one, showing a bit more of the power supply.
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Old 12th November 2006, 03:02 PM   #4
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The PCBs I bought from Rod (one of the improvements over the old version).
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Old 12th November 2006, 03:02 PM   #5
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Looks solid!

Let us know how it sounds (especially with the BG output caps) after setting the bias is done. I was very happy with my DoZ but replaced it with a GC, then a sonic t-amp and finally the amp6. Maybe I should listen to it again soon just to see if that was a good decision.
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Old 12th November 2006, 03:03 PM   #6
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Showing the preamp wiring and softstart board.
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Old 12th November 2006, 03:33 PM   #7
paulb is offline paulb  Canada
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What bias current are you using, and how hot do the heatsinks get?
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Old 12th November 2006, 03:48 PM   #8
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i like the look of the blue caps...
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Old 12th November 2006, 03:52 PM   #9
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Quote:
Originally posted by paulb
What bias current are you using, and how hot do the heatsinks get?

I'm aiming for 1.5A. At that current, the heatsinks get warm, but not too hot (I estimate they'll stay below 50C).
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Old 12th November 2006, 07:39 PM   #10
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Another "technical specification": the amp weighs around 14 kilograms .
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