Beftus
100+ Head-Fier
- Joined
- Feb 14, 2010
- Posts
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My 12AU7 Mk II is alive. Finished it tonight, finally got around to putting it all together. Worked first time.
some specs:
aluminium top panel also doubles as a bit of a heatsink
each triode now has it's own grid stopper resistor
no cathode resistor bypass caps as I want to try higher gain tubes
Elna RJH (C1,C6) and Silmic (C3,C5) caps, Silmic's are 50 volt type
MKP1837's as bypass and interstage caps
2.5" tall heatsinks (that still get pretty hot compared to 2" tall ones)
Still to do:
mount blue tube LEDs and wire up two resistors for bright-off-dimmed settings to be operated with a on-off-on switch (right one)
Nasty surprise: a cheap RCA jack spilled it's guts, a stark reminder to buy better quality parts. My Mk I is now missing one RCA jack...
How does it sound? Schweet! Doesn't play as loud as Mk I because it lacks C7 and C8. A picture to prove it happened.
No pics of the wiring inside. Wanna know what it looks like? Imagine a bowl of spaghetti...
some specs:
aluminium top panel also doubles as a bit of a heatsink
each triode now has it's own grid stopper resistor
no cathode resistor bypass caps as I want to try higher gain tubes
Elna RJH (C1,C6) and Silmic (C3,C5) caps, Silmic's are 50 volt type
MKP1837's as bypass and interstage caps
2.5" tall heatsinks (that still get pretty hot compared to 2" tall ones)
Still to do:
mount blue tube LEDs and wire up two resistors for bright-off-dimmed settings to be operated with a on-off-on switch (right one)
Nasty surprise: a cheap RCA jack spilled it's guts, a stark reminder to buy better quality parts. My Mk I is now missing one RCA jack...
How does it sound? Schweet! Doesn't play as loud as Mk I because it lacks C7 and C8. A picture to prove it happened.
No pics of the wiring inside. Wanna know what it looks like? Imagine a bowl of spaghetti...