Does anyone care to ask an amplifier designer a technical question? My door is open.
@rsf07
I wish I could tell you more on the specs of the speaker but there's little info. Roger Sanders does use a dbx Venue360 DSP unit he modifies (there are no crossovers or transformers in the speakers that I'm aware of). When you say "direct drive" amps since I'm non-technical what are you referring too? Can you send links to your own direct drive amps?Much appreciated. I will soon publish something about my amp, but as you can see without your information my specs will do you no good. I can build up to about 5,000 volts. Beyond that its like building a radio transmitter. My speakers work at that peak and 2,500 V polarizing. I contend running the polarizing high for sensitivity causes air gap saturation. Ive heard it! Once again try to get some info on your speakers. Look at the DIY and ESL forums. Call the manufacturer. Here is the essence of direct drive. A direct drive amplifier is a bridge where each electrode goes to one side of the bridge. One side goes up while the other goes down. The problem with step-up transformers has been covered widely. What is not ever discussed is how much capacitance they have compared to what they are driving. There are very few people designing or making step ups these days and my objection to the Plitron has been covered here in depth. The problem is that designing such transformers is close to a lost art. Without some numbers I cannot say if the King transformers are good or not. I found this link. The minimum is 1.8 ohms at 25 Khz, sensitivity 83 db http://kingsaudio.com.hk/D001.jpg. Not horrible, but choose your amp wisely. Its strange that none of their amplifiers will drive this speaker at all. I havent looked at the rest which are rather Martin Logan style. |
Hi ramtubes, thank you for that and here’s a followup. If triodes are low impedance and OTLs like high impedance, what was Jon doing then when he switched the OTLs to triode? i can tell you that the amps sound better after the conversion, and they are more stable too. The bias and the balance don’t drift anymore. Jon Specter made the conversion with some guidance from George Kaye of Moscode. Both formerly worked at NY Audiolabs. |
Hi. I was turned off tubes when a Mac 2275 couldn’t properly drive my ML Summit X’s (yep, ‘soft’ bass’). After some searching I found an Accuphase E-600 matched beautifully. My question is: how can Accuphase make a class A amp that runs cooler than many A/B amps, and substantially cooler than other class A amps that can give you serious burns when touched? |
