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   Home » Melquiades Amplifier » 5 Channel Version of Melquiades (22 posts, 2 pages)
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  »  New  Super Melquiades Amplifier...  About the Super Melquiades Bass....  Melquiades Amplifier  Forum     29  175776  07-16-2005
  »  New  Summary: my/your audio: year by year..  The 2017...  Audio Discussions  Forum     44  246430  12-29-2006
  »  New  Jessie Dazzle Project..  Will this better to be auditable?...  Horn-Loaded Speakers Forum     172  1066008  08-03-2007
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  »  New  A DSET is better then an expensive SET..  DIY Stradivarius...  Audio For Dummies ™  Forum     41  229989  09-21-2007
  »  New  Incorporating active crossovers into DSET..  Thanks...  Melquiades Amplifier  Forum     2  28328  07-22-2008
  »  New  The DSET perspective examines the Herb Reichert article..  Are you still in Reutlingen, Germany?...  Melquiades Amplifier  Forum     5  63960  07-01-2009
  »  New  Thomas Mayer’s Triamp..  It is much more then juts "properly calculated and...  Melquiades Amplifier  Forum     2  24082  03-03-2010
10-07-2013 Post does not mapped to Knowledge Tree
skushino
Seattle, WA
Posts 93
Joined on 07-07-2004

Post #: 21
Post ID: 20136
Reply to: 4076
High-Pass Filter Help
fiogf49gjkf0d
Romy, would you explain / help me better understand how you implemented the HP filter in Melquiades?

The schematic shows a series cap after the first tube stage (C3 and C4 in the schematic).  I think these are the first-order HP filters, correct?

Question - what is the procedure used to determine the cap values?

My basic understanding is that the knee of the filter is a function of the cap value and input impedance of the following stage.  I'm getting lost on determining the input impedance of the following stage.  I have a hunch I'm overly complicating things.

My goal is to HP my ML2s around 60 Hz.

Thanks.
10-07-2013 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-28-2004

Post #: 22
Post ID: 20137
Reply to: 20136
Very easy.
fiogf49gjkf0d
HP means high-passing, right? In Melquiades I do it by changing the coupling cap between the stages. You can do the same in ML2. To unsolder the cap from ML2 is pain in ass but you might juts clip one of the lead and solder another smaller cap next to the big one. To know the cap value you need to know the input impedance of the ML2 second stage and then juts run a first older filter against the fixed impedance. I think ML2 has fix bias and it have to be very easy to find out what would it be.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
Page 2 of 2 (22 items) Select Pages:  « 1 2
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Super Melquiades Amplifier...  About the Super Melquiades Bass....  Melquiades Amplifier  Forum     29  175776  07-16-2005
  »  New  Summary: my/your audio: year by year..  The 2017...  Audio Discussions  Forum     44  246430  12-29-2006
  »  New  Jessie Dazzle Project..  Will this better to be auditable?...  Horn-Loaded Speakers Forum     172  1066008  08-03-2007
  »  New  6 Channel Version of Super Melquiades..  The first Milq screw up....  Melquiades Amplifier  Forum     131  821538  08-08-2007
  »  New  A DSET is better then an expensive SET..  DIY Stradivarius...  Audio For Dummies ™  Forum     41  229989  09-21-2007
  »  New  Incorporating active crossovers into DSET..  Thanks...  Melquiades Amplifier  Forum     2  28328  07-22-2008
  »  New  The DSET perspective examines the Herb Reichert article..  Are you still in Reutlingen, Germany?...  Melquiades Amplifier  Forum     5  63960  07-01-2009
  »  New  Thomas Mayer’s Triamp..  It is much more then juts "properly calculated and...  Melquiades Amplifier  Forum     2  24082  03-03-2010
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