In Reply to: RE: Lazarus basic preamp posted by Crazy Dave on December 18, 2016 at 16:06:21:
It works to certain extent.
Phono section hums with 60hz motorboating/ oscillation at every 5 seconds apart that is volume dependent. After doing some measurements, HV regulator decoupling cap is the suspect for now.
The original parts in this preamp are marginal at best. The 250v metalized coupling/ decoupling caps everywhere are destined to be ruined with constant stress. The decoupling cap at HV regulator is constantly stressed at 280v with 250v specs. The filament cap is a cheap 50v cap but is designed to take 48v. What a joke!
In terms of the cookbook, to spend 50 EU from a foreign country simply doesn't make sense. I respect the designer's copyright, however he has passed away. I am actually very puzzled by the lack of info for this preamp. Schematics seems a secret of some sort purposely hidden by this manufacturer. I don't understand the mentality of that, and no wonder this company cannot survive the real world. I guess I will just hand trace it.
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Follow Ups
- RE: Lazarus basic preamp - fpharryc 17:08:22 12/18/16 (4)
- RE: Lazarus basic preamp - Boli46 03:53:53 12/20/16 (1)
- RE: Lazarus basic preamp - fpharryc 19:41:18 12/20/16 (0)
- RE: Lazarus basic preamp - Uncle Mike 06:39:24 12/19/16 (0)
- RE: Lazarus basic preamp - Crazy Dave 19:41:42 12/18/16 (0)