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
Thorloki 9-22-2017
The amplifier used was the Bryston 28B SST3 1,000 watt per channel
mono blocks....

Thorloki 9-22-2017
As for Bryston amps DC protection, I personally spoke to Mr. Brian Russell, one of the owners of Bryston, and he ASSURED me, that
the 28B SST3 DOES NOT have DC output protection.

What about DC **input** protection? (See my further comments below).

Also, looking at the Bryston site it appears that the SST designation is not used for their "cubed" series amps. Did you mean 28B3, or perhaps 28B SST2?

Ralph (Atmasphere), while a schematic for the 28B3 does not appear to be available, a schematic for the 28B SST2 can be found at the Bryston site here.

Note in zones B1 and C1 on the second sheet that a 68 uf capacitor is in series with the inputs!

Personally, FWIW, I believe the OP is sincere, but I don’t know how to reconcile the reported experience with the presence of those capacitors, which would block DC. Unless the amp is a 28B3, and that design omits any such capacitors. I note, though, that the bandwidths of both designs are identically specified, down to "<1 Hz," which suggests that they may be similar in that respect.

Regards,
-- Al


OP - Do you have any idea the brand of caps that failed?

As a speaker maker (hobby) I'm very much into capacitor brands, I'd be very curious if there was a failure in a Mundorf or SCR, especially if there were repeats.

Best,


E
This situation definitely must be clarified or it will hurt the company too much.
As a general note, buying anything made in China carries additional risks, no doubt about that. And I see no good reason for respected manufacturers to even consider it.
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Another thing I’ve gotten from this thread is the realization that I miss Paul Harvey.