ramtubes
Responses from ramtubes
| Does impedance of a speaker change when one bi-amps? @pkvintage I have bi amped several systems and never heard a difference that would justify the additional amp. Bi wire, same thing. I did hear a difference with an active 3 way system with an external crossover though. It was a Linn isobarik Brik... | |
| Whats the FATTEST sounding Tube amp to warm up Lean speakers? @elizabeth I have experimented with my system and can say there are amny things that contribute to lean sound. So the problem may partly be the speakers inherent nature, however there are plenty of things that an accentuate the problem. I a... | |
| Over and Under Biasing as means for tone control @dumbeat I read somewhere that under biasing tbe Joule 100 takes a bit of sparkle off, which might be desiarable with some speakers or source players. I have measured many amps of that design. I will say that the output impedance does rise as i... | |
| Whats the FATTEST sounding Tube amp to warm up Lean speakers? I will say that Bobbie used the Music Reference RM-9 in many of his industry shows. There are many Merlin/RM-9 owners out there. Lets hear from you :) | |
| Over and Under Biasing as means for tone control Using bias as a tone control is a fool's errand. What people are calling bias is actually idle current measured across a 1 ohm (typically) resistor. Bias is an negative voltage on the grid and varies by tube type and circuit. It runs between neg... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @roberjerman I read a report by JA measuring a Prima Luna tube amp (some years ago). He found an output impedance of 8 ohms! This means a DF of 1 ohm or less! Combined with the typical varying impedance of most speakers this is way too high! How c... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @roberjam Ohm’s Law rules the amp/speaker interaction! And I agree with you that DF need not be excessively high to have adequate results! Indeed ohm law rules everywhere. My objection is that damping factor is not damping the woofer and as long ... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @georgehifi And the same, even more so, goes for preamps, if it's loud enough that's all you need, there is no advantage to have it "able to be louder" if it's loud enough already Yes, lots of people assume that they will continue to get more ... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @gnaudio I spent close to $20k on a pair of brand name monoblocks, plugged them into my dedicated 20 amp outlets and they had a loud line level hum, hired electricians, changed out grounding rods etc to the tune of $3k in costs. Took all my ot... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @mapman I do not have spl measurements but will give that a shot with my cell phone over the weekend maybe and report back. My concern about cell phone SPL meters is how do they know the sensitivity of your microphone. Is there one spe... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @stfoth... where do these forum name come from? Hello, RM! You mentioned the recent measurements of the Cary SLI100. Reminds me a bit of one a few years back on the 300SEI.https://www.stereophile.com/content/cary-audio-design-cad-300sei-integr... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @btp24 Roger, why is damping such an outdated term? ;-) I have heard you speak of how even a low output impedance amp doesn't, contrary to common believe, "damp" a woofer. You have quoted Paul Klipsch on the subject, as I recall. As Paul said, ... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @mapman I use the receivers only as a simple demonstration of the benefits of more clean power in a line that otherwise is mostly similar in design. Just my gut feel but I suspect there are many who have underpowered systems that clip perhaps in o... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @georgehifi Just look at the frequecy response into a quite easy simulated speaker load!! that’s unacceptable, over 5db variation. no power at 200hz and at 4.5khz, nothing below 50hz and above 10khz, and two peaks at 60hz and 1.5khzhttps://www.... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. @vdotman Just wanted to say hello from someone who knew you back in the day when you were at Audio Art in Richmond. I really like the fact that you are sharing your craft and are encouraging dialogue with those who share your passion.dale grigg ... |