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In Reply to: RE: Cayin has new tube integrateds posted by mbnx01 on April 23, 2016 at 17:56:45
It's extremely unlikely we'll ever see any objective data regarding the performance of the OPTs. That's a crucial area of any tube amp, but in this case - like most Chinese products - a total unknown. I would never buy an amp that has no reputation for the quality of its iron.
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Buy Chinese. Bury freedom.
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Read what Stereophile measurments has to say about Cayin output transformers
http://www.stereophile.com/content/cayin-300b-integrated-amplifier-measurements#gUmK07qxeaGMVHbz.97
"The response into higher impedances is basically flat up to 15kHz..."
Remind me why this is good performance?
"the A-300B does meet its specified power of 8W (9dBW) at 2% THD as long as the load impedance is at least twice the magnitude of the transformer tap used."
No kidding, even the squarewave displays were derived by driving an eight ohm load from the four ohm taps. This is highly indicative of transformer deficiencies.
"...its excellent squarewave response and wide bandwidth are tributes to excellent output-transformer design."
LOL. That statement could only be made by omitting as much of the relevant data as possible. Notable in its absence is high power, low frequency distortion performance that is needed in order to know something about core quality. Everything here points to poor quality transformers.
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Buy Chinese. Bury freedom.
Yes I have read it and compared with most single ended tube amplfiers this is an excellent performence, far better than many much more costly products. If you are familiar with tube amps you would recognize that.
It is not a high powered tubed push-pull amp that may provide lower distortion at high power, but partnered with the right speakers, and tubes it will give 0,2% distortion at normal listening levels, and very few people notice anything above 15kHz.
"The response into higher impedances is basically flat up to 15kHz..."
Remind me why this is good performance?
BECAUSE with then a -3dB point into 8 ohms of 38kHz MORE THAN GOOD ENOUGH
"the A-300B does meet its specified power of 8W (9dBW) at 2% THD as long as the load impedance is at least twice the magnitude of the transformer tap used."
BECAUSE PARTNERED WITH A SUITABLE SPEAKER A POWER LEVEL OF <1 WATT IS ALL YOU NEED AND THE GIVES <0,2-0,3%THD THAT IS NOT NOTICABLE AND LESS THAN THE SPEAKER DISTORTION. RUNNING 4 OHMS TAP OM 8OHM LOAD ALSO GIVES LOW OUTPUT IMPEDANCE wich is good
No kidding, even the squarewave displays were derived by driving an eight ohm load from the four ohm taps. This is highly indicative of transformer deficiencies.
YOU ASSUMPTION IS SIMPLY INCORRECT.
"...its excellent squarewave response and wide bandwidth are tributes to excellent output-transformer design."
LOL. That statement could only be made by omitting as much of the relevant data as possible. Notable in its absence is high power, low frequency distortion performance that is needed in order to know something about core quality. Everything here points to poor quality transformers.
INCORRECT:The Cayin's handling of squarewaves was excellent, with no ringing apparent with any combination of output tap and load impedance
THE LOW FREQUNENCY DISTORION IS FAR BETtER THAN MOST PUBLIHED DATA FOR TUBE AMPLIFIERS. TAKE A LOOK IN THE STEROPHILE ARCHIVES.
Happy listening, SS og Tubes
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Edits: 04/25/16
"All transformers are imported from Japan which are processed by silicon steel. "
I still remember a communications trade show I attended in Beijing in the late '90s. One of the vendors was selling microwave products, and there was a large pile of cardboard boxes in one corner of his booth. All the cartons contained various items of Chinese junk, and all were proudly printed with "MANUFACTURE IN USA."
Seriously, no claim from any Chinese seller is believable.
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Buy Chinese. Bury freedom.
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