Part II – January 24, 2010
Today I decided to roll some tubes on the EF5 starting with a TungSol 12AU7. I also decided to:
[*]Remove the “cage” around the tube to facilitate the rolling of tubes. IMO the “cage” not only makes the rolling of tubes more difficult than it needs to but it also impedes cooling of the tube. Although in all honesty the tube in this amp barely gets warm.
[*]I installed a Herbies Halo, not so much because it helps in all situations but because I happen to have a few laying around and they do look cool.
[*]Like the EF1 I feel the Plexiglas “window” although nice to look at does not allow for optimal cooling. The EF5 does have additional cooling via slits on the sides and bottom. Nonetheless I opted to install an o-ring under each of the four screws holding the Plexiglas “window” thus adding an small air-gap all around it. Time will tell if it helps or not.
[*]Replace all four plastic feet from both the power supply and the amp section. One thing that has bothered me a lot with both the EF1 and EF5 (it is nitpicking I know) are the hard plastic feet used. These feet do hold the amp in place when you insert or retract the