All those EF86 type, this is gold!!!!!
Your tube collection is pretty impressive!!!!
The advice about the tube I agree, because the capacitance at the output coupling can act as a high pass filter, the bass can be shadowed on low impedance headphones like the magneplanars. Increasing the output coupling capacitance will allow the bass to fully express itself.
The 5998 tube has high mu, and the it will increase the impedance of those low impedance cans, thus increasing bass response.
Best is to use high impedance can, or if you really love your low impedance can like the above gentleman with Grado "beauty" PS1000, then you only have to increase the capacitance with good capacitor!
Although tubes still have different character so I wouldn't say capacitance is more important, but it sure is the fondation of the amp!
BENDIX JAN CEA 6080WB - 2
GEC 6AS7G CV2523
CETRON 7236 - 2
CHATHAM 6AS7G copper grid - 2
GEC 6080 - 2
GEC CV2984 KB/Z - 4
GEC 6080WA - 1
RCA 6AS7G black plate - 4
GE 6AS7G copper grid - 4
GE 6AS7G - 2
JAN GE 6AS7G copper grid - 4
Drivers (triodes) (NOT COMPATIBLE WITH 339, must modify custom socket wiring):
MULLARD CV1932 KB/FE (round plate) clear type - 2
GEC CV1932 smoke type - 2
L63 OSRAM bottom flash - 2
GEC L63 smoke type - 2
RAYTHEON JAN CRP 6J5WGT Brown base - 2
BRIMAR 6J5GT - 2
SYLVANIA JAN CHS 6J5GT (round plate) - 2
TUNGSRAM 6J5GT UK flat plate
TUNGSOL VT94A bottom flash
Drivers (pentode in triode strapped mode):
TUNGSOL 6SJ7GT - 4
VISSEAUX 6SJ7MGT - 2
RCA JAN 6AC7 VT112 - 2
MULLARD EF80 - 4
TELEFUNKEN EF800 - 4
I used to have GEC and amperex buggle boys EF80 type but I sold them.
I confess this is too much tubes, but hey it's a lot of fun all together, adding to that the mod of the amp itself it gets really too much ^^ right! :
SCR MKP film capacitors 250V - total 520uF (4 x 100uF + 4 x 30uF)
Paper in Oil capacitor K40Y9 1uF 200V - 2
Teflon capacitor FT3 0,1uF 600V - 2
Mills 50W 1000ohm 1% non inductive - 2
Mills 50W 820ohm 1% non inductive - 2
Caddock mp930 non inductive resistors 1% all over
Bradley comp bleeder résistors - 2
Kiwame metal film resistor
Solid copper gold plated 1.5mm wire in teflon sleeve
BC Vishay 1000uF 200V - 6
BC Vishay 440uF 250V - 4
Solid alu cone feet
Milled solid alu knobs
Vishay hexfred low recovery Graetz custom made on heatsink - 8
And I made a little present to the 339, that is a new DAC Meridian Explorer.
I'm so Lucky with the sound 339/HD650 gives me ^^
To me, this is like a dream comes true, this is my modern "poor's man Orpheus setup"
Your collection is plentiful,too.
My first amp is DV333 (Like LF336C, XMDKQ's product earily), it's capacistance only 30uf, and quaility no good.
I used very much kind of tubes, and had big change, quaility and character of different tubes was obviously in the DV333.
In the my 339 reference, effect isn't obviously of change the power tubes. Even use 6N5P in the 339 reference, it still make good sound.
I think high capacistance make the power tube effect isn't obviously on the LF339, and 'the smell of tubes' is more light than DV333 or DV337.
But, replace the driver tubes will be more change than power tubes, through the LF339 and DV333, so don't save money in this.
Maybe, my outline make a mistake.I'm sorry, using english isn't easy for me.
Then, I think my 339 renference can better than "Sennheiser Orpheus", because I have to heard it last week.
My 339 renference can drive Grado PS1000 very well, the high frequency is like electrostatic earphone.But, have more storng bass and dynamic.
Edited by kanshouhin - 3/18/13 at 10:10pm