balderon
1000+ Head-Fier
- Joined
- Nov 24, 2008
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I would recommend applying the Amphead and Regal mods as part of your initial build. It's certainly easier to make a few component changes now rather than later.
Originally Posted by balderon /img/forum/go_quote.gif X2 dean0: The temperature of my DAX was very warm with a similar setup as funch. With the 90ma 270DAX transfo (w/EZ81/Regal mod) my B+ was dropping to < 238v@96ma. Changing to the 270FX (or 370FX) has worked out very well. The transfo is barely warm and the B+ is at spec with plenty of power to spare and without any significant heat buildup. |
Originally Posted by balderon /img/forum/go_quote.gif I would recommend applying the Amphead and Regal mods as part of your initial build. It's certainly easier to make a few component changes now rather than later. |
Originally Posted by adamus /img/forum/go_quote.gif Whilst in the modding mood, could we replace the cathod resistor of the first gain stage with an LED, thus eliminating the bypass resistor? It probably wouldnt work great stock, but with regals mods, the leds should be fairly linear (and have less impact on the signal than the bypass cap? |
Originally Posted by adamus /img/forum/go_quote.gif yes, thats precisely what it is, but by doing that you a running the top triode with a difference of 120ish volts between heater and cathode. |
Originally Posted by fishski13 /img/forum/go_quote.gif what's the heater to cathode voltage rating? |
Originally Posted by fishski13 /img/forum/go_quote.gif what's the heater to cathode voltage rating? http://www.jj-electronic.com/pdf/E88CC.pdf i also don't understand where you are getting 120V. http://cavalliaudio.com/bijou/images...elVoltages.gif btw, my amp is silent with Amphead's mod. |
Originally Posted by adamus /img/forum/go_quote.gif Why not then elevate it with DC to create the safety margin for the HK rating? |