Gm70 amplifier software
Add to favorites. Compare this product. Go to the OMA website for more information. Characteristics Other characteristics audio, for home automation systems. Weighing pounds and built on three chassis, The Hollander provides the most powerful, detailed and natural presentation of music possible when used with OMA or other high efficiency loudspeakers. Each chassis is built by hand from solid Pennsylvania black walnut with handmade dovetail joinery, finished in tung oil, and topped with slate.
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SET Amp and Speaker- Cost of Admission and Why?
At TestHiFi we discuss and develop ways to measure aspects of music reproduction. Sometimes, working on my own loudspeaker projects, such aspects draw attention. About such an event I want to write this time. It is good enough to show the most important voicing aspects clearly. It also has low output impedance.
More about this later. Pure solid state sources. For my ears, these provide even more natural sound. Necessary to check if my speakers reveal this. First — what is impedance? A loudspeaker presents a load, which is driven by the amplifier output voltage.
Hence, lower impedance draws more current at a given voltage. That way, they provide current unimpeded by internal resistance.
Nevertheless, most are not perfect at this. Usually, some amplifier output resistance remains. Sometimes people ask me if they may use a nominal xx ohms loudspeaker manufacturer spec on an yy ohms amplifier output. Well, besides many manufacturers overstating the impedance, it is also far from being constant. At those frequencies with high speaker impedance, less current is drawn from the amplifier. Vice versa, low speaker impedance induces higher amp out voltage loss, lowering speaker drive voltage and SPL output.
All in all, the frequency dependent loudspeaker impedance results into a similar looking SPL variation. Amplifier output resistance together with terminal and cable resistance determines how strong the SPL deviations are. Most solid state amplifiers — such as my chipamp — have low output resistance about 0. But single ended SE tube amplifiers without feedback from the output stage have higher output resistance. Let us assume a not unreasonable 3 ohms for a simulation of the effect on loudspeaker SPL.
The following picture shows the simulated difference between the chipamp driving an assumed perfectly linear loudspeaker, compared to our 3 ohms SE tube amp:. SPL varies between Speaker impedance shown again to indicate correlation. Now for a real world example, with even higher output resistance, measured at the listening position. I divided the measured SPL response with the SE tube amp by the same using a chipamp, to show the difference.
Left and right channel results shown:. The speaker used is the same as simulated above. I dedicated a lot of time to improvements of my Betahorns during the last 2 years. With very good results. Due to their higher directivity which suppresses the influence of some room reflexions horn systems are very revealing.
Honing the SPL response towards neutrality during many voicing listen and measure sessions rewards me with exceptional uncolored music reproduction. Simply because they produced markedly different tonality. Sometimes I tried to emulate the effect by varying the speaker response, mostly without success. That was more than a decade ago. The tube amp in use is based on a GM70, powerful, with relatively low output impedance not yet measured.
The Betahorn has much lower impedance variations, therefore the influence of amplifier output resistance is much lower than in my previous example. Please see my last blog Simple Distortion Measurements for some measurements. Via this crossover modification I tried to balance the midrange reproduced by the chipamp similar to that using the SE tube amp.
Not only this, but also phantom images appeared larger. All in all, the mod did not turn the chipamp into the more open, real and dynamic sounding GM70 SE. Otherwise, it would not sound even more superior with more complex sounds than the chipamp. Nevertheless, a good step in exactly that direction! As perceived by me, of course you may judge differently. I decided to integrate this effect as user selectable into the Betahorn crossover. But when comparing tube and solid state amplifiers, we should not forget the influence of their output impedance on the sound of the loudspeakers they drive.
Only speakers with purely resistive frequency independent impedance will purely show the difference in amplifier sound. Measurements with REW, just as wonderful and free! The Sound of Tubes? But, before that change, I care for mostly linear speaker impedance. Why care for linear loudspeaker impedance?
Categories Allgemein. HiFi Adventures. How much quality of a microphone do you need for simple measurements. Search for headphones which help me learning to identify specifics of time and phase coherent sound. Back to tubes Hi-Res, yes but …. To change your privacy setting, e.
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Click on English at the top-right.. The search function here made no result.. Interesting design. Find More Posts by Vortex. Dont know why he use Primary RA 9K it not efficient, hobbist here are using 7K for more power and less cost, but it could be used 6K primary too. Nice to have more one GM70 amp its a great tube.
darTZeel NHB-468 mono blocks in my system
To get more information contact me at: webmaster audiodesignguide. This is an expert-only project because the high power supply voltage, about 1KV. Be careful, it can kill you! Keep always one hand better if it is the left hand behind your back. After 2 years of tests I have develop with Fiat srl and Walter Gentilucci an output transformer with the following specifications:. In this amplifier I will try to use the stacked power supply configuration to skip the inter stage capacitor so a dc coupled. In any case the inter stage capacitor change the sound of the amplifier so to get a good result it is necessary use hi-end capacitors like the Jensen Copper film paper in oil but these are expensive like an inter stage transformer. The stacked power supply configuration in a two stage only amplifier is a good and simple solution.
300B SE Amp: 47 Driver
Just wondering about your choice of a 10K OPT. With the very low plate resistance of the tube ohms , wouldn't something like a 5K OPT be more appropriate? The 6BQ5 is a pentode with a lot higher plate resistance, while the 6S19p is a triode with very low plate resistance. I haven't worked out the distortion figures from the plate curves with this tube and load line, but from working with other tubes and load lines, I believe the calculations lead to some general findings.
"แหล่งซื้อขายสินค้า B2B ออนไลน์สำหรับธุรกิจ SME ในไทย"
Paul White, who's owned almost every Roland guitar synth built, puts the new GK1 synth driver and GM70 "brain" under test. Is this the first pitch-to-MIDI system that really works? Roland were the first company to take synth control by guitar seriously, and their latest offering shows they've lost none of their enthusiasm - or their ingenuity. Only access to the outside world was via a monophonic CV and gate interface, and the package cost rather more than a complete system based round the new GM Due to limitations of the design, the instrument never enjoyed much popularity - though I must confess that I bought one. Its successor, the GR, is probably still the most playable guitar synth ever built, but is non-programmable and produces a very limited range of sounds.
What is the Single Ended Triode thing?
AES project A. Audio Amateur Corp. Audio Bizzaro - D. Forum, tubes etc. Audiomobile, Inc. Donker Duyvis's Home Built Loudsp.
The Sound of Tubes ?
Discussion in ' audio ' started by Coda II , Oct 18, Log in or Sign up. Advertisement pink fish media. I get them, not the intended recipient.
Post by simon » Sat Mar 02, pm. Post by IslandPink » Sat Mar 02, pm. Post by Nick » Sat Mar 02, pm. Post by IslandPink » Sun Mar 03, pm. Post by Nick » Sun Mar 03, pm.
Forum Rules. Thank you Jack. I just found a great preamp I think I may settle with for awhile so I understand your journey. I wish it was that simple. I like to tinker once in a while. Reminds me my youth. And the Raspberry Pi ecosystem is a nice and cheap way to learn about software design.
Print this Page. All your ideas relating to the best possible application of vacuum tubes , schematics , specific topologies, diagrams , modules , your ideas of specific audiophile related vacuum tube problems, and how to solve them — all this is kindly Welcome! A must read for the beginners and medium advanced tube lovers. Very good presentation of various tube topologies and what they are used for.
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