kijanki
Responses from kijanki
| Is there an average life span for a preamp? AFAIK every preamp is class A. Saving power (class AB) is unimportant in preamps. | |
| Low damping factor but fast& high current SS amps? Negative feedback increases both DF and the bandwidth but it does not mean that high DF = fast amplifier. Amplifier might be slow to start with or have bandwidth intentionally limited at the input.Slew rate might be important but let's see how muc... | |
| Is there an average life span for a preamp? Joe - 12000hrs is nothing. The only perishable things inside (other than mechanical switches) are electrolytic caps. Their life is in order of 50years in room temperature. Every 10deg C temp. increase cuts their life by 2 (they dry-out). Since pre... | |
| Low damping factor but fast& high current SS amps? Liquy - I never said they are related. That wasn't my quote. | |
| Low damping factor but fast& high current SS amps? "How does feedback lower DF"Magfan It increases DF (lowers output impedance).Lets take amplifier that has gain of 30 (31.6dB). When input voltage is 1V output voltage is 30V. Output voltage drops (for whatever reason) 1V under 1A load to 29V. T... | |
| Low damping factor but fast& high current SS amps? Magfan - Deep feedback lowers output impedance (also lowers THD and IMD). Amplifier's configuration affects initial output impedance. Class D amps for instance connect speaker to power supply and GND (zero impedance points) all the time, only pola... | |
| Low damping factor but fast& high current SS amps? "So, I believe that high DF indirectly let's us know that the amp is trending towards high bandwidth (fast) & will be capable of high current delivery (if it's power supply is able & the music signal demands it)."High current demand is at ... | |
| Low damping factor but fast& high current SS amps? Zuio - your speaker, most likely, has inductor in series with the woofer. This inductor commonly has resistance of 0.08ohm (or more) making DF<100 no matter what amplifier you connect to it. Look in the middle of the table of the best solid cor... | |
| Why 24/7 warm-up period on amps? Paperw8 wrote: "i would have thought that the power supplies in these devices were a regulated a bit better than your comments would lead me to believe." - most of power amplifiers have unregulated power supplies. | |
| Why 24/7 warm-up period on amps? Paperw - My statement about -3dB clearly said voltage and also said before "other than power". Please read carefully before you post. Are you still arguing your 10log idea for voltage in spite of what I told you about common agreement in all measu... | |
| Why 24/7 warm-up period on amps? Atmasphere - sorry for using word "waste", since filament makes it all work, and overstating losses. With my tendencies to exaggerate 50% error ain't bad at all. | |
| Why 24/7 warm-up period on amps? Paperw8 - Voltage ratio in electronics is, and always has been 20log(v2/v1). Pretty much anything other than power is always 20dB(k2/k1) including sound pressure, sound level etc. -3dB of voltage means 0.708 of a value. 12dB means ratio of 4, 20dB... | |
| Acoustic Zen Adagio Speakers? I was planning to buy Adagios but ended up with amazing Hyperion HPS-938:http://www.realhi-fi.com/pdf/HFNhyperion938.pdf | |
| Why 24/7 warm-up period on amps? "they may only be on for a few milliseconds per cycle" This current is not only huge but have very high rms to average ratio heating windings, while high frequency content heats up the core of transformer.This huge current spikes' amplitude and ti... | |
| Why 24/7 warm-up period on amps? dB=10log(P2/P1)=10log((U2^2/R)/(U1^2/R)=10log(U2^2/U1^2)=10log((U2/U1)*(U2/U1))=10log(U2/U1)+10log(U2/U1)=20log(U2/U1)Al, Dave, please leave some beer for me. |