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    Twin Cities, MN
  • Interests
    Music, hunting, good patterns, small groups, clean sound, cars & motorcycles & boats that work, kids that don't whine (can't have it all...)
  • My System
    Living Room: re-built Epic CF-2, powered by a Marantz NR1604 receiver; it's just easier to deal with than the '61 H.H. Scott 222C, sadly. JBL 12" sub.
    Lab: KG2.5 with Crites x-over rebuild and titanium tweeter diaphragms. '62~ish 222C

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DirtyErnie's Achievements

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  1. Raw rectified DC, without the tubes in their sockets. If you put the tubes in, you'll get the ~48v. You're both right. 😉
  2. If they sound great, does it really matter? There are some decent frequency sweep videos on the YouTubes, running those seem a little more practical for in-room checks.
  3. ^^^ This first. Electrolytics, selenium rectifier, clean & tension sockets. Don't worry too much about voltages being 'over' as long as the heaters are 7v or less. I'll look up what I did to make the bias voltage variable. I think it was a couple of 10-turn precision resistors, will check the value.
  4. I changed the 1.2K series resistor (screen grid voltage, with the 8K/20w shunt resistor) for 3.3K, lowered my screens to ~315v. The stock ~360v made the JJ EL84 have a 'harsh/busy' kind of sound, now they're smooth.
  5. Mine has a black cable running front-to back by the selenium rectifier. gotta get back to soldering on that one.
  6. There is the notion that an amplifier is a modulated power supply. From that perspective, everything from the power plant to your speakers has an effect.
  7. I think the surface temp limit referenced in most of the spec sheets I've seen is something like 250*C. Capacitors should be at least 85*C. That's a lot hotter than you can handle.
  8. Toy Hauler? aim them out the back and enjoy the closest thing to perfect acoustics.
  9. With? Con: More Gear. Pro: can tune the system and the room to something resembling 'perfection'. Without: The opposite of that ^^^^^^^^^.
  10. 8-ohm drivers, should meter out about 6.3 or so. maybe a bit more...
  11. Yup, that would do it. used to play bass for a guy that gigged with one. the bar would let us turn it up to 0.8-1.1. Mesa V-Twin pedal for tone. Apocalyptically loud. 😁
  12. If you were doing it right, they got hit so hard they broke in instantly. 😉
  13. Did you notice both the lows AND the mids cleaned up?
  14. Some of them. Then you get the older-school stuff with naked paper cones and tiny motors. Few things are black-n-white. Most things are closer to 'on a scale of 1-to-10...'
  15. I'll go with 'Yes.' Whether that's due to equipment or ears adjusting is open to debate. I've definitely heard new vacuum tubes 'open up' after a few hours of use. Guitar speakers are quite well known for loosening up after several hours, I don't see why any other cone speaker should be different.
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