Frihed89
1000+ Head-Fier
I think you are right about the Orion. I wasn't considering buying one, just passing on my experience to a recent poster. I have some DIY KT88 triode monos that operate in pure Class A @ about 12W RMS, but no relationship to headphones. That said, I don't know much about rolling this tube, because I have never owned an EL-84 amp. I am a 12AX7 aficionado. I think the Siemens triple mica tubes are nice, also the Telefunken smooth plates, and any of the the 1950s US-made black plates. The brief offering by Micro-tech solutions was also brilliant, but their stock appears to be tied up in court, following bankruptcy. I find the best current production tube to be the Sovtek 12AX7 LPS tube, or their 5751 where it works as a good sub. Try them, even if you are looking for NOS. You will be surprised. The old American made triple mica 5814s (GE/RCA) are a pretty nice 12AU7.
I'm a little wary of Cayin, for all the usual reasons. Chinese iron is generally not that hot; some time the circuits they copy are not correctly done, and so on. But I really like the EL-84 output tube it employs. I haven't heard an EL-84 amp I didn't like. You are right about the need for good OPTs, although I can't comment on the Cayin's, beyond my aversion to Chinese iron The specs for the OPTs used in high-end headphone amps don't get much attention and some of the mfrs I have contacted won't reveal too much. Donald North is an exception and his OPT is a key to the performance of his Sonnet. I am very keen on Audio Note (UK) double C cores and, at a lower price pont, the Lindahl OPTs with amorphous cores. Trafo-matic has some double C-cores that look interesting and are priced about the same as the Lindahls, but I have never heard them, as they are new. I will.
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I'm a little wary of Cayin, for all the usual reasons. Chinese iron is generally not that hot; some time the circuits they copy are not correctly done, and so on. But I really like the EL-84 output tube it employs. I haven't heard an EL-84 amp I didn't like. You are right about the need for good OPTs, although I can't comment on the Cayin's, beyond my aversion to Chinese iron The specs for the OPTs used in high-end headphone amps don't get much attention and some of the mfrs I have contacted won't reveal too much. Donald North is an exception and his OPT is a key to the performance of his Sonnet. I am very keen on Audio Note (UK) double C cores and, at a lower price pont, the Lindahl OPTs with amorphous cores. Trafo-matic has some double C-cores that look interesting and are priced about the same as the Lindahls, but I have never heard them, as they are new. I will.
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I'm betting you could probably find the actual Chinese amp that this is based on for under 1k. My speaker amp is of similar KT88 design but without the headout (rebadged Vincent TAC) - definitely class AB with that rated power - exactly like my one 2X55 pentode.
The Cayin HA1A tube amp I'm using for the LCD2 has performed admirably - exquisite treble extension with superb subbass extension (not lacking in both extremes when compared to solid state - more subbass than BCL) - Ultralinear mode (forward/neutral) and Triode mode (laid back/warm - treble still exquisitley extended - so not dark). Pure class A single ended design with speaker outputs for 2.2wats UL and 1.2w triode. More detailed and refined than both my other hybrid amps (Xcan and Vincent). This amp must have very good output transformers (4 position impedance selector) - its definitely a class above the MingDa in all areas. Later tonight I'm gonna finally order some tubes (the Cayin came with Electroharmonix - I can see the label through the window) - should be fun to tube roll. TTVJ sells this amp at the 800 buck mark.