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!
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!
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.
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.
The filter caps (Sangamo) are only rated for 63V.
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.
40-0-40 only gives ±57V, the DH200/220 are ±63V.
With a Leach type amplifier it will clip at about 300W/4R.
With a Leach type amplifier it will clip at about 300W/4R.
djk said:
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).
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.
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.
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.
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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