My bad then. Its really 80 watts into 8 ohms. Didn't pay enough attention to my previous post. So it really is 12.8 watts into 50 ohms. The amp looks like a beast, not your normal class ab amp.

I did a quick spreadsheet to calculate, but maybe I screwed up? Still, 6.4 W into the he6 is plenty. EDIT: I double checked, and pretty sure its 12.8W at 50 ohms. This is assuming that voltage will drive the wattage at 50 ohms and not current. 80 watts at 8 ohms gave a voltage of 25.3, and...

I was curious about the X350.5. Spec sheets says it leaves class a at 80 w, much higher than normal for a class ab amp. 40w into 8 ohms is about 13 watts into 50 ohms, so it should be in class a all the time with a he6.

Output transformers say they are 50 ohm output, which would make sense for headphones. Might not work well for 4 or 8 ohm tweeters. Also, for that money, you would think they would drill the chassis. But after I saw who ANK was, knew why it was so much. Randy

I built a ACA a while ago, and use it for my HE6 SE's. Off the speaker taps. Sounds great to me. I do plan to upgrade, to a bigger, better Pass Class A amp. Every once in a while, used ACA's come up for sale at diyaudio. Randy

Thanks, I'll look into the Babelfish J. Did look at other Zen Mod's designs. He is selling ludef kits, but not many out there so wanted to go with a something safer. Does the Babel J fit in the diyaudio 4U chassis? I may end up building more than one amp, reusing the chassis and hopefully the...

I'd build a J2, but you can't find any 2SK3497's to build it with. The CFA3 is an interesting idea, but I'm pretty set on a Pass class A clone at this point.

I've been thinking about building an amp for my HE6SE's, a diy clone version of a Pass class A amp. Seems like the Aleph J2 is well regarded, but I don't think I can build one. Has some obsolete parts that seems like Pass has a stockpile of, and no where else to be found. Of the other...

You need to remove the transformer covers, and put the shield directly around each transformer. I took some pics at the time, but have deleted them so have nothing to show you. You need to remove the bottom cover to get at the screws that hold the covers in place. I had a mistake in my...

I had a first batch drop unit with a small amount of hum that I sold. Before selling, I wrapped the transformers with magnetic shielding material, basically eliminated the hum. I only heard hum with sensitive cans, normal cans were fine, but fixed it anyway. The shield material was given to me...

Quick look at the datasheets. 12SN7 uses .3A @ 12.6V for heaters 12AU7 uses .15A @ 12.6V for heaters. If circuit is designed for the AU's, it might have a problem with the extra current, but then again it might be fine. It depends on the heater circuit design. If you're going the other way...

You really need to look at what specific tubes you want to swap. Its more than pinouts, there is heater voltage and current to worry about, as well as a bunch of other parameters from the datasheet. Max voltages, gm (transconductance), etc. I'm far from a tube expert, know just enough to be...

I read that post a long time ago. Someone at Fiio (through Aliexpress) did try to help me for a while, but then they just stopped talking to me, so I gave up. I also emailed a request to support when this first came up, but I never heard back from them. But I'll try again. I received them just...

I contacted Fiio about this a while back, they were basically worthless. Same with Aliexpress, I bought them from Fiio's aliexpress store, so I will no longer buy from either one.

10 meters? I got a lemon, mine is only a few feet, if lucky. And really only usable if I'm sitting and working, can't use while walking.