PrimaLuna Dialogue Premium Preamplifier. DESTROYS SPEAKERS!!



A few months ago, bought TWO of the above mentioned preamps. ( I have 2 stereo systems)
Within 6 weeks of the purchase, the power supply of my speakers burns out!
I purchase and replace the power supply.
Three days later, the second newly replaced power supply is burnt out!
After much investigative work and heartache, I discover that the Pre amp is the problem.
It is defective and puts out DC. which burns out speakers.
After, testing the second unit, I find that it is defective as well, EXACTLY the same problem.
I return the units to my dealer, who returns them to Prima Lune.

I received a phone call from a Mr. Kevin Deal, big cheese at PrimaLuna.
Told me that the capacitors, on BOTH units had failed and the units were putting out DC.
He even THANKED me, for being a guinea pig, and discovering the flaw in his units.

He offered me a pair of tubes, as "compensation" for my troubles!! What a joker!!

WOW, a pair of tubes for blowing my $30,000. speakers!!

The height of arrogance and total disregard for the consumer of his product.
To all audiophiles, do yourself a favour, STAY AWAY for this brand, unless you want your speakers cooked.

TOTAL lack of quality control, MADE IN CHINA junk, what more needs to be said.


Mr. Deal, WAKE UP, and STOP selling defective products!!


If, you are using PrimaLuna, and your speakers fail, check the amp or pre amp.

George


Montreal, Quebec, Canada.
thorloki
The Bryston is equipped with DC Offset protection. If the preamp made DC, the speakers would not be damaged unless the Bryston's protection circuit failed.
I checked with Bryston.
The Bryston amps, as well as many other high end amps, DO NOT
have DC output protection. ( such circuits degrade sound)

If, the pre amp, puts out DC, the amp will amplify it, and send out to the speakers, which is what happened in this case.
I'm not sure how a DC servo circuit would degrade sound if properly implemented, so it is disappointing to hear Bryston does not incorporate them.

The worst case is of course capacitor coupled, but almost all tube preamps are anyway.

Adding sensors at the output to disconnect the speakers, inputs or even turn the whole amplifier off are quite worthwhile.

DC servo circuits operate below 10 Hz. A combination servo + disconnect should be required << shrug >> but hey, I don't own a large successful audio equipment company.

Best,

E