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Old 6th January 2013, 05:02 PM   #141
clm811 is offline clm811  United States
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Quote:
use 3 pair @60+ V rails!!
I noted that Herve Delatraz uses a single pair of OP devices in his DarT Zeel amp, for 100watts@8/160W@4ohms. I'm thinking that two pair would be alright, with active protection against DC offset & overtemp -see kit I'm using:

MA9 S2 Clone 150W 150W 8ohm Poweramp Kit High End MJL4281A MJL4302A | eBay

Quote:
BTW , what dynaudio (340/360/260)
The Dynaudio Foccus kit uses 17w75XL and D28/2 w/compensated 1st order X/O.
Mine is a 3 way tower with active woofer below 80Hz, so it reduces demands on amp.

-Chas

Last edited by clm811; 6th January 2013 at 05:04 PM.
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Old 6th January 2013, 07:07 PM   #142
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Originally Posted by LetterBeacon View Post
I'm looking at building an amp for my system, and this could be ideal. Have there been any reviews yet or any frequency plots?

Thanks!
Frequency response is (below 1) 5hz-100k+ -flat .

Noise is better than -115db according to my sound card's spectrum analyzer.
I can't hear any hiss from this amp with full gain and an ear to the tweeter.
Much better than any mid priced home theater system amp setup.

Gain should be exactly 41.25db - any source should drive it to clipping.
A few builders have described it here in this thread. I think it is very neutral and reflects exactly what it sees at it's input.

With a proper supply it can really show you what any speaker is capable of -
LOT's of headroom - I've blown speakers just just for the hell of it -
Durable is another way to describe it.

Any other description would be subjective , the amp will be what you put into it (matching transistors/choice of transistors , 1% resistors,quality derated capacitors , chassis/general amp layout)... but even with recycled parts it
will beat a mass produced unit.

OS
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Old 14th January 2013, 03:25 PM   #143
ncg2013 is offline ncg2013  United Kingdom
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Default Transformer for Honeybadger...

Hi All

Simple newbie question: what transformer should I be using for Honeybadger?

Will sometimes be listening at high volumes.

What VA? 600?

Voltage? 2 x 42? or should I use two transformers?

Simple answers please!
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Old 15th January 2013, 06:23 AM   #144
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Quote:
Originally Posted by ncg2013 View Post
Hi All
Simple newbie question: what transformer should I be using for Honeybadger?
Will sometimes be listening at high volumes.
What VA? 600?
Voltage? 2 x 42? or should I use two transformers?
Simple answers please!
For just one clear answer, more information is needed.
Power:
If you put an ohmmeter into your speaker jack, does it say 3, 4, or 6 ohms?
Is the speaker a large 3-way or a 2-way?
What is the max power rating of the speaker?
Costs:
Do you want bigger stereo separation plus better dynamics (including bass) or do you want lower costs?
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Old 15th January 2013, 09:21 AM   #145
ncg2013 is offline ncg2013  United Kingdom
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Hi Daniel
The speakers I have at present are Monitor Audio RX6, 6ohms, 90db sensitivity, Max power 125w. But I do want to upgrade them fairly soon. Not sure what too but something that could handle the Honeybadger with ease - Suggestions for DIY or off the shelf appreciated.

Not worried about costs, I want best!
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Old 15th January 2013, 11:50 AM   #146
AndrewT is offline AndrewT  Scotland
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Originally Posted by ncg2013 View Post
........... Monitor Audio RX6, 6ohms, 90db sensitivity, Max power 125w.............
I suspect your MA RX6 are 4 to 8 ohms speakers with a 4ohm equivalent bass driver/s.
If this is the case, then design the amplifier to drive a 4ohms load. Not a 6ohms load.

Check the speaker schematic.
Measure the bass/mid resistance.

PSU design comparison:
. . . 8ohms . . . 6ohms . . . 4ohms
Vac . 35 . . . . . .35 . . . . . 35
VA . . 150 . . . . 225 . . . . . 300
mF . . 20 . . . . . 30 . . . . . . 40
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Last edited by AndrewT; 15th January 2013 at 11:54 AM.
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Old 15th January 2013, 09:16 PM   #147
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I am terribly confused by Antek - AN-4235 with the test conditions stating secondaries were parallel during the test. Normal hookup would be with the secondaries effectively series, but the problem is that the datasheet doesn't give any specs for using the transformer normally. This is a maximized core, minimized copper build (a giant core barely covered in thin gauge copper), so I assume that secondaries series normal use would perform a bit differently than their secondaries parallel test.
Question:
If I would like the equivalent of an old fashioned 5.7A 70VCT (35+35VAC Center Tap), to power each monobloc, then would I need Antek - AN-6238 transformers?
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Old 15th January 2013, 10:33 PM   #148
6L6 is offline 6L6  United States
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There is no doubt that the Antek spec sheets cause some confusion. Oh well. At least they have some measured data, many manufacturers or distributors don't even have that.

Something to keep in mind - in the description they state that " In most of the cases, this transformer can be output 20% more power from its rating at 60Hz power source without any problem."

If that isn't enough to settle your worries, then just buy the next bigger one.
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Old 15th January 2013, 10:59 PM   #149
AJT is offline AJT  Philippines
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Quote:
Originally Posted by danielwritesbac View Post
I am terribly confused by Antek - AN-4235 with the test conditions stating secondaries were parallel during the test. Normal hookup would be with the secondaries effectively series, but the problem is that the datasheet doesn't give any specs for using the transformer normally. This is a maximized core, minimized copper build (a giant core barely covered in thin gauge copper), so I assume that secondaries series normal use would perform a bit differently than their secondaries parallel test.
Question:
If I would like the equivalent of an old fashioned 5.7A 70VCT (35+35VAC Center Tap), to power each monobloc, then would I need Antek - AN-6238 transformers?
you mean short circuit tests? the object of the test is to determine copper losses and so the testing calls for all secondaries of the "traffo under test" to be effectively shorted together, rated primary current is then allowed to flow using a variac to set a voltage that allows this....this procedure is common to all transformers undergoing such test...

add the copper losses(short circuit) and the core losses(no-load test) and you can get the efficiency of the traffo....to the average user, this is of no consequence....

a 600VA traffo for the honey badger is more than enough imho....
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Old 15th January 2013, 11:11 PM   #150
6L6 is offline 6L6  United States
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Quote:
Originally Posted by danielwritesbac View Post
Question:
If I would like the equivalent of an old fashioned 5.7A 70VCT (35+35VAC Center Tap), to power each monobloc, then would I need Antek - AN-6238 transformers?
Ok, you lost me.

5.7A at 70vct is 400VA An Antek AN-4235 would be exactly what you are asking for.

38v+38v (or 76vct) at 600VA is 7.9A
(And even better, the Antek 6238 says it can flow 2x 38v windings at a total of 9.4A -- that's more than 700VA!)
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