2. amps-preamps
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Lazarus tube preamp noise ....

Hi all,

After listening for a while on my new tube system I decided to complete the whole tube line by using the Lazarus pre-amp's phono as input to my aux of the Legend preamp. Knowing in advance from the seller that this preamp had some sort of "hiss" I still bought it to experiment. Whoa ... the hiss is higher than I expected kind of ... you know ... like the hiss from a cassette tape but even higher . Here are what I've tried:

1) Leave the preamp on for 3 days in a row . The hiss noise is less dominant but is still there.

2) Change the 12AX7 tubes from Tesla to military 5751 ... Still noisy .. even more .

The next thing I plan to do is to replace the 12AU7's pair but doubt if this' gonna work. My friend recommends to replace all the caps but doing this is a major thing and the last resort if I have to. Any ideas to do next?
dongnhac

Showing 2 responses by dongnhac

dongnhac OP
5 posts
 
Marakanetz,

The 12AX7's are on a seperate board vertical to the plane that the transformer is mounted on. Do I need to move the transformer somewhere else ? Where do I get the 12AX7 dampers?

Thanks,
Don
dongnhac OP
5 posts
 
Modifying the unit ? That sounds too technical for me as I'm only a beginner in electronics. Are there any literatures that teach ume how to do that? 12AX7 is cheap, using different types of tubes may cost too much ....
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