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Home » Melquiades Amplifier » What about 220V 50Hz? (4 posts, 1 page)

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11-12-2008

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Global
Posts 2
Joined on 11-13-2008

Post #:	1
Post ID:	8838
Reply to:	8838

What about 220V 50Hz?

I’m planning to build the Melquiades. Owning something that is better then a Lamm is definitely something for me.

Having 220V 50Hz. What changes are necessary in schematic?

Bigger PSU caps, inductors?

11-12-2008

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Paul S
San Diego, California, USA
Posts 2,658
Joined on 10-12-2006

Post #:	2
Post ID:	8840
Reply to:	8838

If you have to ask...

Global, perhaps you are being modest, or maybe even a little disingenuous. But if you are being serious, then I worry that you may not be ready to do this on your own yet.

In the first place, what makes you think Melquiades is "better than a Lamm", and why at this point should this matter to you? More importantly, what about the Lamm gives you trouble in your system? You haven't said.

Also in the first place, you do realize that this is not a Heath Kit you're shopping here? IMO you will be miserable with the project/results unless you have a "critical understanding" of the rote principles and tasks involved, not to mention the critical need for clear "targeted objectives" necessary to bring such a project to full fruition.

Meanwhile, for all my apparent whining about the Lamm, it is not only a pre-built (and very well built!), fully-realized "product", but it really is pretty much plug-and-play, and it really is "good enough" for the VAST majority of HE speaker users. Unless you have had ML2s in your system for a while and found good reason or reasons to move on, you might want to re-think the relative worth/value of these two options.

Best rgards,
Paul S

11-12-2008

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Global
Posts 2
Joined on 11-13-2008

Post #:	3
Post ID:	8841
Reply to:	8840

???

Ok I won’t ask anymore questions until I can afford a Lamm.

11-12-2008

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Romy the Cat

Boston, MA
Posts 10,159
Joined on 05-28-2004

Post #:	4
Post ID:	8842
Reply to:	8838

The 220V's Milq?

Hi, Global.

Leaving aside the unnecessary to be called notion of Melquiades vs. Lamm I would return to the essence of the thread: what changes are necessary in schematic if it goes for 220V. I do not think that any changes would be necessary. All transformations have voltages posted on their on secondary’s coils. So all that you need is to get own set of power transformers that output the right voltages. You might be careful with TR3 transformer. If you go for VERY high value of C10 (the LF section of my current Mila has 30.000uF at 350V) then you might drop the R22 and C11 chain and drive juts one LC section right from amplifier. In this case you would need lower voltage on secondary of TR3, I would say 115V.

Also, purely theoretically is you are 220V then you are most likely at different frequency 50Hz vs. 60Hz. At different frequency the minimum inductance for chokes will be changing but it has very little practical meaning, if any, as you will be very changing with 10Hz and you will easily tune by to drawing current more current. Wait, with higher frequency less need for critical inductance, Will you? Anyhow, it is very easy to measure when the LC filer is built.

So, I would not worry about it.

Rgs,
Romy the Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

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