I totally agree with you regarding the capacitor support of GND..and the importance of sufficient and good enough capacitance in normal audio circuits.. whether they are class A single ended or Push-pull....But this is rather different than what Hiraga does with his Monster and 20 and 30 W designs...as the reference here is pure local and not as on his amplifier designs global...
The voltage controlling device and the load share the same reference...This is what set's this design apart...
BTW I like the PRE-PRE....for sure one of the best MC-heads ever....just so hard to find parts...
The voltage controlling device and the load share the same reference...This is what set's this design apart...
BTW I like the PRE-PRE....for sure one of the best MC-heads ever....just so hard to find parts...
I have much to say about these things...
In many topologies, the voltage and current amplifying sections can conveniently be separated.
In the single-ended Nemesis choke was used. For designs like that, a poor quality power supply can be disastrous.
Despite being entirely balanced, Le Monstre is sensitive. Separate power supplies for each channel would have been better, but for the input and output stages it is not unambiguous. (He considered doing that).
The PRE-PRE shows an exceptional degree of sense and insight.
In many topologies, the voltage and current amplifying sections can conveniently be separated.
In the single-ended Nemesis choke was used. For designs like that, a poor quality power supply can be disastrous.
Despite being entirely balanced, Le Monstre is sensitive. Separate power supplies for each channel would have been better, but for the input and output stages it is not unambiguous. (He considered doing that).
The PRE-PRE shows an exceptional degree of sense and insight.
Today we listened to the follower-light (with my preamp also) in comparison with the Yamaha B-2x, the last is in very good state, and we connected it directly to CD player, it has possibility of adjusting the volume.
The conclusion: B-2x is very transparent amp, with very good microdetails reproduction, it excellently controls the bass section of PMC EB1i. At the same time, it has not changed a bit specific bass character from EB1i, now I know that it is inherent to speakers. Compared to the follower-light, in general, I would say the B-2x sound is a bit "sandy", as from most of AB class multi-stage transistor amps, including the top quality ones.
The sound of follower-light fits better acoustic music, more natural and pleasant, and the bass although a bit less impressive, but nothing to do with serious drawbacks.
For my system, I could consider the B-2x only for driving the bass section in bi-amping.
The conclusion: B-2x is very transparent amp, with very good microdetails reproduction, it excellently controls the bass section of PMC EB1i. At the same time, it has not changed a bit specific bass character from EB1i, now I know that it is inherent to speakers. Compared to the follower-light, in general, I would say the B-2x sound is a bit "sandy", as from most of AB class multi-stage transistor amps, including the top quality ones.
The sound of follower-light fits better acoustic music, more natural and pleasant, and the bass although a bit less impressive, but nothing to do with serious drawbacks.
For my system, I could consider the B-2x only for driving the bass section in bi-amping.
maybe a separate base amp..is better at driving the base.. but would also time the music in a different manner and will have its own character... different than the follower.. and two rather different ways to play the music...try to merge that into one system is really asking for trouble...It may play louder...but for sure you loose any coherence and the ability to portray the music...I personally wouldn't go there...
If You setup the equal gain of both amplifiers i dont see any problem to use the push-pull for low frequencies and SE for mid-high. Of course it will sound different, but that difference could be result with better sound.
GoranB,
of course, a separate subwoofer has many more pros than cons. Is the filter up an running?
of course, a separate subwoofer has many more pros than cons. Is the filter up an running?
Actually I do not plan to go for bi-amping, as I mentioned, the difference in bass region compared to B-2x was very small and it does not worth to take other risks related to bi-amping. Only theoretically, if the bass section in crossover is limited by 150-200Hz, this is definitely more convenient for bi-amping than this frequency 500-1000 Hz.
And I completely refuse using sub-woofers for top level sound, I have one Velodyne CHT 12 standing without use several years, this is feasible solution only for home theater.
And I completely refuse using sub-woofers for top level sound, I have one Velodyne CHT 12 standing without use several years, this is feasible solution only for home theater.
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Why? When the impedance ratios and capacitor value are well chosen there should be a good 100 Hz square wave.
Squares through capacitor into a low impedance....the top line will slope as it decharges through the LSP load...
I studied this question quite in detail, with 22000uF output cap there is no problem with square wave even at 10 Hz.
Look at several my posts from 50W Zen9 thread
http://www.diyaudio.com/forums/pass-labs/145303-50w-version-zen9-6.html#post1993237
Only for 2 Ohms load we start to observe some slope at 10Hz square wave.
As for some difference in bass region with Yamaha B-2x, I guess it is simply a difference in output impedance, maximum peak current into load and maximum output power, what produces some difference. At the same time, I must repeat, the difference is very small, much much less than with Zen4, for instance.
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100Hz square signal on the output on my tube preamplifier looks awfull, a triangle shape, does anyone knows the reason for that? I measured also the comercial product the push-pull topology Marantz PM44SE on 100 HZ square signal, little better but far from good.
For good square wave reproduction, one must follow no-copromise approach, that, in implementation for mass production, can be found mainly in luxuary segment.
Forget about high energy capabilities among hi-fi equipment, including my Pioneer A-66x (100W at 8 Ohms).
In my previous post I attached the circuit of tube preamp im using, the comercial product im keeping just for comparation. Anyway i should try to encrease the value of output caps, and add some mkt in parallel.
You mean just to use a gain stage? As You know the E182CC stage works like catode follower lowering the impedance, so i think its crucial stage to drive ans SE PF99. Ok if i omitted it i should add an capacitor on the output of the gain stage, so, ill have the worst situation...i think.
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