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In Reply to: RE: careful now posted by Michael Samra on April 10, 2014 at 20:18:08
Is one of those chokes connected between the driver plate and a voltage divider in the 300B cathode circuit?
If, yes then this what you have. I don't know how low of ripple is "low enough", but figure that probably the designer already made that call.
I not advising, just saying pay attention to what is important when tweeking this circuit, you know what you're doing. Since you claim to have good recipes for signal cap combinations, the cap marked "oil" above, is one.
Follow Ups:
It is DRD..The 100uf poly is dead quiet tho but I can parallel in another 100uf poly or a pair of 30uf giving me 160uf total.
Honest amplification is better than excessive 2nd order distortion anytime.
I don't know how the DC filament supply is done there, but if it's CLCRC then that could be improved by going LCRC or LCLCL or LCRCL. If a C is last then a pair of resistors to the cathode node instead of off one side might help get the final PS C out of the equation. I think it's Thomas Mayer who
suggests an L for the last component having good AC rejection.
Hi Michael,
Add a 0.1uF Teflon cap after the last power supply cap. It made a big difference on my Starchiefs.
You could also parallel a 0.1uF Cu cap (Audyn true copper or Vcap CuTf) across the Ultrapath cap.
You get lower noise and greater transparency with the Teflon and body and soundstage with the Cu.
Other than that not worth spending any more on the DRD as I have found out.
Cheers
Smart845
Thanks Smart
I have both Teflon and paper in oil caps..I have Audyn caps and SonicCap plats.I love the Russian FT-2 and FT-3..Both are excellent as are the KBG pio and the K40Y caps but they all need break in.
Honest amplification is better than excessive 2nd order distortion anytime.
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