Quad 606, connecting power supplies together

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05-Jul-2017 06:06 PM

FBatista

FBatista

Posts: 95

Hi,

I'm approaching the best way to connect both power supplies (the 2 secondary windings) to feed only one amplifier PCB.

Should I do it the 405 way by phase parallel connect the windings, using only one (uprated) rectifier.

I'd like, but I'm not sure is possible, to distribute current, by phase connecting each winding through each KBU8D rectifiers. This way it would be able to use the original layout of the power supply PCB. It would also be great to maintain both rectifiers and filter capacitors working where they sit.

A helping hand is much appreciated.

Best,

Francisco

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06-Jul-2017 02:09 AM

EJP

EJP

Posts: 1357

For what purpose? All you'll get is more current going into the channel, but the current going out of the channel is still limited. There is no apparent benefit.
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06-Jul-2017 08:03 AM

Joost Plugge

Joost Plugge

Posts: 912

If you don't change the current limit in the 606 board, the benefit is low, maybe at some short peak levels, but is it worth the trouble and sacrifice a 606 channel?

But apart from these questions, you can simple parallel the two DC power supplies output and connect them to one board. In this way you also doubled the elco value for one channel. To prohibit any current flowing from one supply to another, place a 0.3Ohm series resistor in both the Psu lines as current sharing devices.

Joost Plugge

DaDa Engineering

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06-Jul-2017 04:59 PM

FBatista

FBatista

Posts: 95

Thank You for the quick and useful reply.

It's clear that power isn't the issue. It mainly has to do with a slightly better, sound separation, I've experienced one of these days ; from a simple test of separating channels to each amplifier. It got me revisiting a great deal of my collection throughout an afternoon.

Though subtle, I really enjoyed it : clearer, airy, spacious sound. Could it be a subtle phase delay?! Though it's the same model, they aren't exactly equal amplifiers.

Francisco


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07-Jul-2017 03:07 AM

EJP

EJP

Posts: 1357

It seems pretty extreme. You already have two separate power supplies per 606, with nothing in common except the PTX primary and ground, and you want to common them together to get two separate power supplies over the pair ... If you have two 606s they would be better deployed on a bi-amping job.
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11-Jul-2017 12:08 AM

FBatista

FBatista

Posts: 95

You are absolutely right.

Yet, I'm still clueless as to where's the subtle improvement coming from.

Yet it is so subtle, I may end up selling the second 606. I really wouldn't need the extra power - and rather focus on further improvement on my main 606.

Regards,



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