Posts by pmillett

Welllll...   I could put the design of the hybrid portable out there, as there are no plans to do anything similar.  At least for now.  However, since it uses all SMT components and a fairly complex power supply...

Just wanted to post a short note about the coupling heard when an unused input is selected on the Butte...   The Butte has a high input impedance.  When the input selector is set to an unused input, there is nothing...

Quote: Originally Posted by Wedge  Pete,   I think folks aren't questioning if the amp can't get loud enough, I think they believe that the HE-6 without gobs of power can't sound right in terms of...

As to the perpetual "how much power is enough" question... not sure if Todd posted it, but I put up some info and a spreadsheet that might help answer the question (or not):   http://www.apexhifi.com/specs.html   Pete

  Quote: Originally Posted by n3rdling  Thanks for the help guys. :)  Everything soldered into place.  Now I just need to get those 10 Ohm resistors and the tube sockets/diodes are in the mail...

  Quote: Originally Posted by n3rdling  On the BOM you forgot to put the 10 Ohm 2W resistors for R22/R23 On the BOM for the caps at C1/C2 the "value" and "description" are different.  Should I use...

OK, the BOMs should be fixed.  Freaky - my local copy had been updated, but for some reason when I published the website updates these files did not get replaced, even though a newer copy existed in my local web.  So I...

  Quote: Originally Posted by n3rdling    For part "Resistor, 220k ohm 2W small film", the quantity is 2 but should be 3 I believe, as you have it listed for R4/R6/R7.  There are also...

    People have asked me for a DIY tube headphone amp design that will drive small speakers (like computer speakers) for quite a while.  I just posted such a design, called "Jonokuchi"...

  Quote: Originally Posted by DavidMahler  It was my understanding that the 307a had a lower damping factor than the Pinnacle. Is this correct? Is the damping factor caused by the...