The F6 Revisited

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#504
The machining was done in stages with my CNC mill, a converted Bridgeport type bed-mill. I used a carbide engraving bit with an pencil grinder air spindle and went only a few thousandths of an inch deep to get a nice clean cut through the anodizing. Conveniently, the stop point for the diamond line operation ended with the cutter over the joint where the LED was placed. I spotted there and then drilled on a drill press to finish the LED hole. There is a "freeware" program called Desk Engrave that I used for the text.
Don
 
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#505
Donaldspace said:
T.A. I have this HUGE spool from Boeing Surplus. Its AWM 105 degree C 16 Ga. I sometimes use a Sharpie to mark both ends of a wire to identify it when installing the wires. One black ring vs. 2 black rings, etc. I didn't do it on this build since it was a one wire at a time assembly.
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I use one trick to change the color of the wire sheath - put a different color of heat shrink tube on it (and gently heat up the tubing so that it shrinks and sticks). 🙂 Cheap and quite easy to do.

Nice work with the engraving!
 
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#509
New additions to the NPXP coming soon…



IMG_0115.jpeg


Best,
Anand.
 
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#512
birdbox said:
Very nice looking boards. Those red resistors look spiffy! What brand/model are those?
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Those are PRP brand. Only went with them instead of my usual CMF 55 because all the values were available and come 1% stock.

Other resistors in the build include Takman metal film (gate resistors) and Mills (feedback, source) and AMRG (feedback).

The caps are Elna Cerafine.

All transistors are matched on a PeaK DCA75 with the exception to the large TO-247 N-channel on the outputs.

Best,
Anand.
 
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#515
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#518
Well, at the end of the day, it’s the design topology that really counts. Let’s see:

  • Austin Buffer
  • Cinemag CMOQ transformer (high nickel version)
  • Choice of FET (i.e. IXTQ75N10P)
  • Amount of Bias (more the better)
  • Provision for output degeneration done with Q1, the top FET
The choice of passive parts for me is just eye candy. The constellation of colors looks pretty and it makes amp building less like dialysis.

I do have a QuantAsylum unit that I will press into use to measure the various harmonics. Should be fun.

Thanks again Tungsten for sharing your work.

Best,
Anand.
 
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