Advice needed - NAD transformer config for new Wolverine?
I am gathering parts to build the upcoming Wolverine and found a broken NAD t773 as a chassis and heatsink donor.
Trying to figure out if I transformers as well, and if so what configuration makes sense. Unfortunately I don't know the VAC on them.
The t773 is a 7x110, with 2 transformers. One runs 3x110 and some extras, one runs 4x110. Curiously, the larger 4x110 runs at 54-0-54v, the smaller at 51-0-51. They must drop a decent amount of voltage as power supply is just under 60 VDC.
Here are the options as I see:
1) use the 4x110 only. I think NADs ratings are a bit conservative and it was capable of higher peak power, so 2x200 seems reasonable.
2) use the two transformers as dual mono. As I understand the different voltage would only effect max potential output and I won't be near there.
3) scrap and get an appropriate, lower voltage transformer recommended for the build.
Note this amp will be driving 4-ohm speakers, though never at high volume.
Any advice on this one?
4x110 - 5 3/8" x 2 1/2"
3x110 - 5 1/8" x 2 1/2"
I am gathering parts to build the upcoming Wolverine and found a broken NAD t773 as a chassis and heatsink donor.
Trying to figure out if I transformers as well, and if so what configuration makes sense. Unfortunately I don't know the VAC on them.
The t773 is a 7x110, with 2 transformers. One runs 3x110 and some extras, one runs 4x110. Curiously, the larger 4x110 runs at 54-0-54v, the smaller at 51-0-51. They must drop a decent amount of voltage as power supply is just under 60 VDC.
Here are the options as I see:
1) use the 4x110 only. I think NADs ratings are a bit conservative and it was capable of higher peak power, so 2x200 seems reasonable.
2) use the two transformers as dual mono. As I understand the different voltage would only effect max potential output and I won't be near there.
3) scrap and get an appropriate, lower voltage transformer recommended for the build.
Note this amp will be driving 4-ohm speakers, though never at high volume.
Any advice on this one?
4x110 - 5 3/8" x 2 1/2"
3x110 - 5 1/8" x 2 1/2"
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Your voltage 54Vac is too high for 4 ohm load.
You should be looking at maximum 45-0 + 45-0Vac transformer (depending on output transistors and heatsink).
I will probably use something smaller 40-0 + 40-0 for four ohms. 400VA per channel.
Sorry cannot go onto this in more detail as we are busy debugging the prototype boards and family commitments.
We will recommend powersupply specs soon.
You should be looking at maximum 45-0 + 45-0Vac transformer (depending on output transistors and heatsink).
I will probably use something smaller 40-0 + 40-0 for four ohms. 400VA per channel.
Sorry cannot go onto this in more detail as we are busy debugging the prototype boards and family commitments.
We will recommend powersupply specs soon.
Thanks for the input, that's what I was thinking too. The general idea, as I understand- lower ohm loads will draw more current and all components of the amp need to handle that stress. What I am having a hard time finding are more specifics. Say I did use both transformers, can I just build a more powerful amp if I:
1) Use both transformers, 1 per channel, which should give plenty of VA though different voltages.
2) Use big heatsinks (approx 6"x12"x1" x2)
3) Use up to 5 cooling fans that were part of the original amp
4) Spec all the components to work with the higher voltage
Or is that pushing more into 'slewmaster' territory and too much for HB or Wolverine? Not sure what the final choice for output devices is for the wolverine and what they can handle.
1) Use both transformers, 1 per channel, which should give plenty of VA though different voltages.
2) Use big heatsinks (approx 6"x12"x1" x2)
3) Use up to 5 cooling fans that were part of the original amp
4) Spec all the components to work with the higher voltage
Or is that pushing more into 'slewmaster' territory and too much for HB or Wolverine? Not sure what the final choice for output devices is for the wolverine and what they can handle.
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