Millet Hybrid Construction Thread
Jul 15, 2005 at 9:13 AM Post #181 of 441
Im almost done with the millet construction when I find out that I have a different Panasonic pot!

Is it ok if I use EVJC20F02D54 instead of EVJC20F02A54?

What are the differences between this two pots?

Thanks!
 
Jul 15, 2005 at 9:24 AM Post #182 of 441
One has a "D" taper the other has an "A" taper.
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Check the PDF for more details------------> http://www.panasonic.com/industrial/...AOK0000PE1.pdf
 
Jul 15, 2005 at 9:53 AM Post #183 of 441
Jul 15, 2005 at 10:16 AM Post #184 of 441
Yea, look at the graphs on the lower part of page 7 of the pdf to see the difference.
The D taper "ramps up slower across the lower half of it's range" and it will may work better with the millet cause the gain is a little to high with some phones.
 
Jul 15, 2005 at 12:56 PM Post #185 of 441
Quote:

Originally Posted by JWFokker
Looks fine, but you can get something better than that for less than that on Ebay. I paid $25 for a 24V/28V 6.2A/5.4A DC regulated power supply. Came in a nice metal chassis too. Of course, it didn't come with cords so I had to make them myself. If you have the skill to building an amp, you can make a couple cables easily enough.


We are on 230V main in NZ and it will be to expensive to send it to downunder.

Thanks,
Sam
 
Jul 15, 2005 at 11:55 PM Post #187 of 441
Do we have to change some resistor value when we stack buffers? and what resistor was that?
 
Jul 16, 2005 at 3:27 AM Post #188 of 441
Quote:

Originally Posted by aeroes
Do we have to change some resistor value when we stack buffers? and what resistor was that?


If you are using the bandwidth control resistors (R6R/L), then change them to 470 ohms. I don't use them because, at least with this amp, I can't hear a difference.

-Drew
 
Jul 16, 2005 at 12:15 PM Post #190 of 441
Quote:

Originally Posted by James281
how did you guys wire the 2 led under the tubes?

i plan to wire them like this, will this work??
LED.gif


on the pcb i don't know which side is positive for the led i guess i will have to try to figure this out.


I'm not sure what voltage this amp uses but I think it will be too high to connect them in a series with no resistor. See this for calculating the resistor you need:
http://linear1.org/ckts/led.php
and this is the way to connect it:
http://www.kickassmods.com/Guides/P&HDled/4.jpg
http://www.tonystrains.com/technews/...all-led-01.gif
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Jul 16, 2005 at 4:17 PM Post #191 of 441
Quote:

Originally Posted by drewd
If you are using the bandwidth control resistors (R6R/L), then change them to 470 ohms. I don't use them because, at least with this amp, I can't hear a difference.

-Drew



I believe that when you double the number of buffers, you halve the bandwidth setting resistor to keep the same setting. According to tangent's site, at least.

So 110 ohms.

Edit: The reason being that it is two buffers in parallel with a 220 Ohm BW resistor on each one so two 220's in parallel is equivalent to a single 110 Ohm.
 
Jul 18, 2005 at 10:32 PM Post #192 of 441
Minus a few finishing odds & ends (getting a knob for it, stacking the buffers, screws for the panels, etc), Amp #2 is done.

All caps are either Cerafines or Wimas (electrolytic caps on the bottom of the board), Alps pot, Hammond 1455T1601BK case, TREAD powered.

AUT_2710_640.JPG


AUT_2717_640.JPG


More pics when its completely done.


edit: not 1455R, 1455T.
 
Jul 18, 2005 at 11:45 PM Post #193 of 441
Quote:

Originally Posted by rreynol
I believe that when you double the number of buffers, you halve the bandwidth setting resistor to keep the same setting. According to tangent's site, at least.

So 110 ohms.

Edit: The reason being that it is two buffers in parallel with a 220 Ohm BW resistor on each one so two 220's in parallel is equivalent to a single 110 Ohm.


So true...halving, doubling...ack!

-Drew
 
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