What is this amp, and what do you think of it? - diyAudio
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Old 4th June 2015, 10:17 PM   #1
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Default What is this amp, and what do you think of it?

Without saying too much about the make or model, can those in the know say what they think of this power amplifier? I don't know how much you can tell from a picture, but any observations relating to quality and value of the item would be interesting...

thanks
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Old 4th June 2015, 10:38 PM   #2
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Old 4th June 2015, 10:39 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

Strange choice and use of that heat sink. No apparent
thermal feedback for biasing. Pretty wimpy board
tracks for the high current stuff. No attempt to use
spare board space as a ground or supply plane.
Hard to work out the rectifier arrangements.

Whatever it is I'd say its not mainstream.
Value wise I'd say nothing special, at all.

rgds, sreten.
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Old 4th June 2015, 11:14 PM   #4
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Those heatsinks don't look adequate.

Save the caps, xfmr, throw the rest out.
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Old 4th June 2015, 11:14 PM   #5
Zen Mod is offline Zen Mod  Serbia
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power wires ditto to bottom side , there is thermal feedback on heatsink (3 blue wires)

though , info about outputs could say more ......

I think there is something interesting , but hard to say more just from pic

and - that's certainly one of wimpy UK amps

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Old 4th June 2015, 11:29 PM   #6
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Quote:
Originally Posted by Zen Mod View Post
info about outputs could say more
Darling-ton

(Philips 15000uF/40V, 1992, junk)
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Old 5th June 2015, 12:22 AM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Zen Mod View Post
there is thermal feedback on heatsink (3 blue wires)

Hi, Yes I missed that looking for traces, rgds, sreten.
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Old 5th June 2015, 01:04 AM   #8
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Looks like the outputs/drivers are point to point wired direct to the PS (on the
heatsinks.

What's left on the board is apparent , LTP , servo, CCS's , VAS. Don't see the
driver pads , but do see the Vbe out on the twisted triple (3 blue's).

A shot of the other side would confirm.

OS
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Old 5th June 2015, 01:09 AM   #9
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The heatsinks look to be substitutions since the output darlingtons are wrongly located on those extruded sections and the narrow ventilation slots don't cover them properly for cooling efficiency. Guessing they could be 72 mm high, would give a free air rating of 2.2°K/W or 2.5°K/W if 55mm high. That's not a lot of cooling when the parts are fitted incorrectly in a poorly vented enclosure.

Even though there is a reasonable sized transformer, perhaps the amplifier should only be rated about 30W/ channel?
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Old 5th June 2015, 01:28 AM   #10
anatech is offline anatech  Canada
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Looks like a one-off build. For all the previous comments I would have to agree that some parts should be recycled, some shouldn't.

Either that or it's an overbuilt DIY headphone amplifier.

-Chris
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