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Lamm LL2.1 Deluxe "DC Offset"?

Hi there,

Is there anybody who has a deep experiences with high fluctuated "DC offset" in Lamm LL2.1 Deluxe PreAmp?.

My Lamm LL2.1 Deluxe Preamp shows a highly fluctuated DC reading that reaching +-200mV even more. Last night measurement showed a flucuated reading and reached +-300mV.

A three weeks continuous observation shows that the preamp DC fluctuation seems higly affected by the swing/fluctuation of AC Volatage,day time and night time. I can see that even as small as 0.3V AC voltage abrupt swing will directly generate significant DC offset in the LL2.1.

Your sharing experience and advices are higly appreciated.
gr-gin
gr-gin OP
17 posts
 
Dear Chayro,

No worries.

My Friend teased me by offering to purchase the unit at half price of my original purchased. He may take the unit for an experiment, he jokingly said. So, worse to worse, ithis might be my last resort solution.
gr-gin OP
17 posts
 
Dear all,

This is to update you on the last finding on my Lamm LL2.1 problem.

I finally replaced the output and coupling capacitors by myself and succeed. No woofer movement again and the measurements showing good results.

so, being in audio hobby, we have to be creative and keep trying finding the solution by yourself.

orpheus10
8,668 posts
 

Unless you're a technician, or at least know electronic fundamentals, leave the lid on, or take a chance on being out of big bucks.
gr-gin OP
17 posts
 
Orpheus 10,

I already loss a big buck on the third week I purchased and owned this brand new unit.

When your dealer not taking their responsibility and treat you badly just like we are a stupid customer, and when the manufacturer ignoring you of being too much proud and confidence of having a realiable product and rather shift the issue to the dealer, what else we can do?.

In that situation, we are no more loosing any buck but our trust to them. Then why we have to relly on them?
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