Iron Man got wood
Some additions , Tasmanian Myrtle burl end plate , Acacia chopping block , Solid alloy feet , Sorbothane pads and Bakelite knob
I have been rolling rectifiers specifically GZ30 , GZ32 and GZ34
Basically the lush open tube character increases as the power of the rectifier decreases . So GZ30 specifically a Philips Miniwatt 5z4gt gives everything a Lana Del Rey feel and GZ34 specifically a Mullard Blackburn 5ar4 brings a more solid state feel with notably tighter bass and treble . I settled for now on a Philips Miniwatt 5v4g or GZ32 which has a nice level of Lana Del Rey but still good definition .
On noise , there is undeniably a noise floor anyone looking for the black hole kind of background modern solid state amps have will be disappointed .
Noise is off course a relative thing , at first the noise was invasive and clearly audible in quiet passages regardless of headphone type . After rolling some tubes I found the input tubes had the greatest effect , fortunately I had ordered a spare pair of 6em7 tubes , noise dropped to barely perceptible with high sensitivity headphones (100dB per Mw) and imperceptible with low sensitivity headphones .
As it stands with my preferred headphone Focal Clear I would not call it noise really it is more of a distant warmth that I need to really look for , pause the music and hold my breath kind of thing . Running in 5998 mode the greater gain lifts the noise to a definable hum but still very distant and only audible with music paused .
Sound quality is magnificent there is an overwhelming sense of organic power I have never experienced with 6as7 tubes .
Combined with a huge perception of space tones are beautifully rendered with each drum in the kit or string of the guitar easily discernible . From my basic research into how these things work it seems Eric uses the transformers to create small pockets of happiness or ideal operating parameters for the more tech people . Upside the tubes perform at their finest downside a little noise .
As with
@UntilThen and Destiny heat is not an issue , measured with a ir thermometer nothing gets over 35c excepting the tubes which are hot , 6as7 plates run 125c stable over many hours .
I would recommend this amp to anyone looking for a distinctive powerful tube amp capable of running near any headphone on the market , just beware it does have character kind of like a vintage vehicle .