Hafler DH200 transformer specs - diyAudio
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Old 18th July 2008, 03:53 PM   #1
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Default Hafler DH200 transformer specs

I have a "salvaged" Hafler DH200 and I have searched but have not been able to get a reliable specification on the Transformer (this is not the international version).

From what I have read it appears to be a 40-0-40 of about 480 VA (or about 6 amps).

If so I am assuming this would give about +/- 55 or 56 volts on the rails.

Does anyone know if I am in right ball park?

My eventual goal is to see if this could be used in building a Leach 4.5 stereo amp.

Thanks!
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Old 18th July 2008, 07:48 PM   #2
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Its about 44 - 0 - 44vac at 480va. The amps have +/-63vdc rails. It will be fine for a Leach amp. I'm working on one now with a transformer that has similar specs.
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Old 19th July 2008, 02:00 PM   #3
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I'm pretty sure it's 40-0-40 at 4 amps, giving rail voltages of +- 60.

The filter caps (Sangamo) are only rated for 63V.
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Old 19th July 2008, 03:23 PM   #4
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I have four of the Sangamo caps sitting in front of me. They are rated for 75vdc. I have two Haflers, both of them have rails of +/-63vdc.
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Old 19th July 2008, 07:01 PM   #5
djk is offline djk
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40-0-40 only gives 57V, the DH200/220 are 63V.

With a Leach type amplifier it will clip at about 300W/4R.
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Old 19th July 2008, 07:34 PM   #6
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Quote:
Originally posted by djk
40-0-40 only gives 57V, the DH200/220 are 63V.

With a Leach type amplifier it will clip at about 300W/4R.
Thanks for the replies.

So it looks like my the transformer on the Hafler DH200 is 44-0-44
with voltage on the rails at +/- 63V.

The transformer that is suggested on the Leach website is 80V AC, (40-0-40) and having rail voltages of +/- 58V.

So I guess my question is how close is 58V to 63V? Is this difference okay with a proper choice of transistors? Or am I worrying too much?

As far as the overall power before clipping, I can live with 300W/4R since this is being used for a horn loaded driver.

I noticed when BrianGT built his Leach in a Hafler chassis, he used a new transformer (40-0-40).
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Old 20th July 2008, 07:18 AM   #7
djk is offline djk
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You can use any voltage with enough outputs.

The Leach LSR&D 101 used three pair of MJ15011/12 on 63V and could drive 2 ohms on music.

I have done six pair of MJ15024/25 on 93V on 4 ohms, and ten pair on 80V on 1 ohm.
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Old 20th July 2008, 11:11 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
the Leach will work on 40Vac or 45Vac.
The bigger expense is that 63Vdc caps can only be used on transformers rated to <=41Vac and only if the mains has <=6% tolerance for overvoltage.

My 230:40+40Vac toroid gives +-58.2Vdc (total Iq=420mA) from 240Vac and gets 311W into 4ohms for the 3pair Jens' PCB design.
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