Hafler DH200 transformer specs

WithTarragon · 18th July 2008, 03:53 PM

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!

Stormrider · 18th July 2008, 07:48 PM

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.

CharleyW · 19th July 2008, 02:00 PM

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.

Stormrider · 19th July 2008, 03:23 PM

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.

djk · 19th July 2008, 07:01 PM

40-0-40 only gives ±57V, the DH200/220 are ±63V.

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

WithTarragon · 19th July 2008, 07:34 PM

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).

djk · 20th July 2008, 07:18 AM

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.

AndrewT · 20th July 2008, 11:11 AM

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.

18th July 2008, 03:53 PM	#1
WithTarragon diyAudio Member Join Date: Jun 2007	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!

18th July 2008, 07:48 PM	#2
Stormrider diyAudio Member Join Date: Apr 2006 Location: Connecticut	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. __________________ AJ

19th July 2008, 02:00 PM	#3
CharleyW diyAudio Member Join Date: Aug 2002 Location: Arlington, TX	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. __________________ Hey is for horses.

19th July 2008, 03:23 PM	#4
Stormrider diyAudio Member Join Date: Apr 2006 Location: Connecticut	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. __________________ AJ

19th July 2008, 07:01 PM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	40-0-40 only gives ±57V, the DH200/220 are ±63V. With a Leach type amplifier it will clip at about 300W/4R. __________________ Candidates for the Darwin Award should not read this author.


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20th July 2008, 07:18 AM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	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. __________________ Candidates for the Darwin Award should not read this author.

20th July 2008, 11:11 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

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