kramer5150
Headphoneus Supremus
- Joined
- Sep 20, 2004
- Posts
- 14,427
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- 209
Quote:
WOW.... thats some intense amp building!!! thanks for sharing.
WOW.... thats some intense amp building!!! thanks for sharing.
Who's the gentleman in suit? My guess the La Figaro boss himself?
Wow! 339 Reference, really nice!!
I wish to have the Audio Precision (AP) analyzer even for one day, unfortunately the kind of measurement apparatus is beyond my reach.
The (Ap) graphs already shows how good the 339 Reference is, really impressive!
The frequency response at low range band is very interesting it's slight boost the upper bass when the load is applied I had similar with my DK339. The mid and high range band is PERFECT -0.4dB on 20kHz! It's probably merit of the new adaptation of input stage (new input tube) may I ask what tubes are they?
The spectrum graph show that mains hum is very low -91bB at 50 Hz almost not audible, THD with the highest 2nd harmonic [dB] -102 and the 3,4,5,6,7,8,9 harmonic below [dB] -110! amazing.
I really appreciate it. You put a lot of thought and effort into that mod. Great work!
Hello people.
How you these capacitors Jantzen Cross Cap as output separation? I want to use them for DarkVoice 336SE. Will there be enough 100uF for channel?
I don't remember now, what is the value of output coupling cap in DV336se?
What headphones will be plugged into it?
In stock Darkvoice 336SE - 20uF per channel, La Figaro 336C - 40uF per channel. But I will only use the circuit from 336SE, I will do all of the new in large chassis.
Sennheiser HD 650.
F = 1/(2 * pi * C * R)
F= 1 / (2 * 3.14 * 0.0001 * 300) = 5.3 (Hz) This means that up to 5 Hz, frequency response is linear, with no recession on the low frequency?
Don't forget too the impedance (or resistance... I forget which) of the power tubes. It gets added to the load impedance of the headphone in the high-pass cutoff frequency equation.
So in a TS-5998, dual triode, paralleled output configuration its ~70ohm + ~70ohm. together in parallel result in 35ohms... that gets added in series to the headphone load impedance. 32ohm grado thus is really 32 + 35 total in the f-Hz calcs.