Tube DIY Asylum

RE: LCR Phono

67.189.148.56

dave slagle

In Reply to: RE: LCR Phono posted by Naz on March 08, 2009 at 05:08:30

a few quick thoughts.

You will have DC current through the LCR with the design you use. Spice will tell you how much. Depending on the inductor design it may or may not be a problem.

I suspect the network to bring the high end back up will not be needed. The inductors typically have enough capacitance to take care of this naturally and in some cases the capacitance is so large it becomes problematic. If you want to buy back the top end you can insert around a 60-65 ohm resistor as shown in the pic below.

Interesting with the tuned CL to buy back the bass... I'll have to look at that one.

dave

Follow Ups:

RE: LCR Phono - Jeff Davison 10:04:31 03/08/09 (3)
Naz has come up with a nice cicuit here. He told be that voltage through the LCR would be +82vdc. The Silk LCT RIAA is tolerant to +100vdc, so it looks like (at least) that module would be workable in this design.
I'm going to wath the evolution of this thread to see if any further mods are done with further insight and/or suggestions for improvement or problem fixes.
Starting to collect parts and I've already started build a couple of Allen Wrights "Super Reg" clones. I'll build this as a complete dual mono after the power transformer dial rectification and dual regulation and separete VCSS filament supplies for the input stage and output stage.
JD

Edits: 03/08/09
- RE: LCR Phono - dave slagle 11:23:19 03/08/09 (2)
  With 82V, the first inductor will have just over 2ma of current through it and the second about 1/2ma. In order to make the LCR like the Silk, R27 and R31 (14K and 68K) would need to be left out. Then no current would flow through the inductors. If the LCR's are built from scratch, the inductors could be designed to deal with this and a proper voltage rating selected for the caps.
  
  dave
  - RE: LCR Phono - Jeff Davison 12:02:17 03/08/09 (1)
    Dave, Naz was using a Tango in his model. I do not know the internals of the Silk as Kittipol is a little secretive. It may or may not be as similar on the inside.
    JD
    
    Edits: 03/08/09
    - RE: LCR Phono - dave slagle 12:46:20 03/08/09 (0)
      in order for it to block DC and keep curent out of the inductors it needs to be the middle design.
      
      Here are the two sims:
      
      And the plotted response:
      
      LTspice file (Open in New Window)

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