Hi there.
I'm newby at this so, please, be patient with me.
I've done a Quad 405 clone with a PSU +-40 Volts succesfully and its sounds better than original I had.
But now, I get a new PSU +-70 V and I don't know how many components I have to change except power transistors and low power ones ( TIPS).
It's worth to try it, or I should change too much components?
Thanks for your answers. 🙂 😀
I'm newby at this so, please, be patient with me.
I've done a Quad 405 clone with a PSU +-40 Volts succesfully and its sounds better than original I had.
But now, I get a new PSU +-70 V and I don't know how many components I have to change except power transistors and low power ones ( TIPS).
It's worth to try it, or I should change too much components?
Thanks for your answers. 🙂 😀
The Quad 405 is designed to work at 40-50 V.
Isn't 70 volts dangerous for the boards?
If it's not, I begin the process 🙂
Isn't 70 volts dangerous for the boards?
If it's not, I begin the process 🙂
It seems pointless and expensive to attempt higher than 50V rails. First, you certainly will have to increase the size of the output stage to 2 or more pairs of output transistors and change most of the smaller transistors and the drivers for higher voltage versions too. That may not be the only problem with increasing rail voltages. Even if you did learn how to compensate for the changes, it would likely still be difficult.
It also means making a new PCB and heatsinks, because of the layout form, unless you add flying leads and mount the transistors elsewhere.
It will be simpler and probably cheaper to use a more correct transformer of ~35VAC x 2 secondary windings and 300VA rating. That will give 50V rails with ample current. Otherwise, as a newb, I'd strongly recommend that you stay close to the original specification.
It also means making a new PCB and heatsinks, because of the layout form, unless you add flying leads and mount the transistors elsewhere.
It will be simpler and probably cheaper to use a more correct transformer of ~35VAC x 2 secondary windings and 300VA rating. That will give 50V rails with ample current. Otherwise, as a newb, I'd strongly recommend that you stay close to the original specification.
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Ok, thank you Ian, I'll look for a new amp with a lower PSU. I have seen one Technics with voltage around 51-54, I hope it's fine for these job 🙂
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