Agreed. NOS 1541a/triodes throughout/ & open baffle here as well. It pairs well with WTMC. Tube inventory secured to see me through this life at leastI agree as well..i'm in the camp of NOS DAC / DHT tube amps / open baffle speakers, and have no plans to switch in this life or the next
I am in good company here!
I also use a NOS dac, fully DHT, interstage coupled, no feedback amplifiers and field coil open baffle loudspeakers.
This combination is the most detailed and lifelike sounding audio system I have ever heard.
Interstage transformers in a tube amp have an advantage over resistor-capacitor coupled stages because they allow the full amplification factor of the tube to be used instead of wasting power on plate resistors. So you need less and lower mu tubes (low mu is better sounding than high mu). It also delivers a stable impedance to the tube so it will stay in the most linear part of the curve (low distortion)
I also use a NOS dac, fully DHT, interstage coupled, no feedback amplifiers and field coil open baffle loudspeakers.
This combination is the most detailed and lifelike sounding audio system I have ever heard.
Interstage transformers in a tube amp have an advantage over resistor-capacitor coupled stages because they allow the full amplification factor of the tube to be used instead of wasting power on plate resistors. So you need less and lower mu tubes (low mu is better sounding than high mu). It also delivers a stable impedance to the tube so it will stay in the most linear part of the curve (low distortion)
Hi Per,
the BOMs start from post #3008
The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
Andrea
the BOMs start from post #3008
The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
Andrea
Andrea, sorry if I have missed somewhere your explanation on the next question, just point me to it please in this case.
As you use TDA1541A, then what is your approach for clocking the DEM-cells? Do you use the separate clock for 16 or 17 pin? What frequency, square/sine?
Thank you!
Ivan.
As you use TDA1541A, then what is your approach for clocking the DEM-cells? Do you use the separate clock for 16 or 17 pin? What frequency, square/sine?
Thank you!
Ivan.
Yes of course, thanks. I know your time is precious but as an enthusiast you should consider for your collection the fun ad1862 dac chip. There is no real utility to make a design cause the chips are rare but witrh the tda1541 S1/S2 & late Taiwans, this dac chips is usefull for benchmark purpose, imho... (pcm 1704 far to be at its quality level imo despite being 24 false bits)
would you care to share which DHT are you playing with ?. I am in search of a nice design for a 2A3 with an interstage transformer. Any hints would be gladly welcomed
Maybe the AD1862 is the best design ever, I own a pair.
My co-developer is planning to build a DAC board with the AD1862 to be used with our top version of the FIFO (as an alternative to the discrete DAC).
Now no DHT ampli at home, I have built an 845 DHT for a friend but it's gone a couple of years ago.
It's a heavily tweaked chinese ampli (the Music Angel 845), practically I saved the power supply, the output transformers and the chassis.
The driver circuit was fully redesigned and the output tubes were replaced with a pair of PSVANE WE845.
It sounds very very good.
When I find the time I will build a pair of GM70 DHT monoblock ampli, I already own all the parts.
It uses a choke as the load for the driver but a 1:1 interstage transformer could be used in its place.
The only issue is the current that would flow in the primary, around 35 mA.
I will share the design as soon as it's ready.
Yes, Jocko liked it a bit.
There is a reason: the AD1862 latches on the LRCK signal, so at such low clock frequencies the close in phase noise is the best achievable.
Pity that the PCM1704 uses the bit clock to switch.
Hi Andrea
Thank you for the answer!
I just think that in your wish to build better DAC, it will be helpful to compare with better implementation of TDA1541A (IMO). I have just tried the async clock (~1MHz) from Abbas and can say that it is a certain step forward compared to capacitor across 16-17 pins. Microdynamics especially on HF becomes natural, soundstage and the action on scene becomes just more closer to real sound. Another reason I am writing here - you can make the separate clock and try it because... You want to make a better DAC, than TDA1541A, you make clocks. So who if not you will try the separate clock for DEM based on your stuff?
As far as I know it's not very simple to synchronize the DEM clock, but I don't know much about that approach.
I investigate as soon as the FIFO Lite will be ready, then maybe I could design a specific board to implement the TDA1541A with sync DEM clock to be fed by the FIFO Lite and the best performer oscillators.
Anyway I believe that a frequency fine setting will be needed.
I investigate as soon as the FIFO Lite will be ready, then maybe I could design a specific board to implement the TDA1541A with sync DEM clock to be fed by the FIFO Lite and the best performer oscillators.
Anyway I believe that a frequency fine setting will be needed.
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