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You should not delete a message (or an entire thread) just because you say it is off-topic, while at the same time saying that it is on-topic and appropriate. If it was really worth posting here in

For those interested in the somewhat esoteric world of High End Audio....I offer some links to speaker simulators Note: Speakers are not nice stable loads, even a single speaker rated at 8 ohms might

One comment about the Hafler test; I would load the amplifier with a reactive load, not just a resistive one. A resistive load is too easy for any amp. Hang some capacitance directly on the amp’s

One steady state and slow swept tones they check out identically (well within expected variance, one amp might have 0.001%THD/IMD and the other 0.099%. He lacks the ability to do really short, 1ms,

Yeah, it came as a bit of a surprise to me that having transistors that had a wider frequency range could end up oscillating way too easily... -- Member of the toughest, meanest, deadliest, most

A couple of comments: Do the amps compare OK on static measurements? If OK presumably he is fighting a transient problem. How do they compare with narrow transients? Do the catch-all Hafler test that

Any diode will do that, and a transistor junction is basically a diode... I remember reading how rectifiers could be used as varactors to tune circuits. -- Member of the toughest, meanest, deadliest,

How do you define high end? But "identical" parts usually aren't. The amount of variation is really somehting to see, sometimes. I have a stero receiver and equalizer in the other room that have been

He came up with the preamp, tone, volume, balance, power amp designs 35 years ago. He's been forced to make minor component value changes as semiconductors came and went. The design is somewhat

Think harmonic distortion. With an FFT analyser you might see it (or not??? I think I got a glimpse of it…) It might happen at 250kHz, but will extend far into the MHz, and AUDIO spectrum! Those

There is a never ending, intense, perhaps psychotic, argument over "Can humans detect phase differences [or phase distortion.] and it shows up in the amplifier wars... This paper takes hard core look

My plan is to compare old good devices with new wonky devices and see if there are any determinable differences.

The matching (testing) amp needn't be perfect - just good enough to compare devices. That's the point. Donald.

Sockets tend to be a bad idea for transistors in high performance audio systems. Even with gold plated transistor leads and sockets, they are a severe failure point. If we can figure out what

I think as I remember at the time, all the rage was about phase. An amplifier could brag about having little to no phase shift over the passband of 20 to 20,000 Hz. That higher bandwidth helped keep

What moron decided an AF amp needed that frequency response!? That's not asking for trouble, that's begging for it.

No idea if this is practical. How many devices in the amplification chain need to be matched or are critical spec-wise? If there are a small number, he could build a "matching amp" with sockets

Years ago, I purchased new an Adcom GFA-545 which also sounded terrible. One channel was oscillating at around a megahertz, which bleed into the other channel too. The manufacturer “stopped at

Jimmy designs complete home theater systems, video switching, audio switching, audio tone/volume/balance, he provides a loop for special effects like 3D decoders, and power amplifiers, "regular"

I second your view! Lots of snake oil and smoke around. Those who do know, keep their mouths shut, and their bank accounts are getting bigger Nuno t. Sent: 07 December 2024 18:37 To: