I'd say most important thing to note is the tubes sold are low testing based on these results in the adds. For me they would be garbage bin material. Here's the Tung Sol datasheet for these tubes: https://frank.pocnet.net/sheets/127/6/6AS7G.pdf Note that tested at 135V with a 250 ohm cathode...

I only remember the release add here on head-fi. In particular this part. Still in the first post here (for now): For me this was such a weird way of advertising. Saying we have tubes that are generally not good enough to be sold. Or not “good enough” to be sold by Apos Ray. When I first...

I think you have seen those Apos Ray "special" tubes in your very own tube collection ;-). As can be seen by the Apos tubes build (6SN7 and 12AU7) they seem to have the exact same internals as the other Psvane tubes from Psvane factory. They are just sold at a premium price with a premium label...

As you can see. They just etched over 6SL7 markings. They probably needed 7F7. Had 6SL7 in stock. Came up with this adaptation to make it work. Edit. Funny they never etched over the GT part. Where there’s no 7F7 GT AFAIK. This is a unicorn.

The famous Genalex Gold Lion vacuum tubes were the exact same thing. All Mullard production, with Mullard/Philips production codes for normal ECC81-82-83 etched on the tubes themselves. Collectors pay extremely high prices for these NOS Gold Lion tubes with B749 or other GEC code; thinking they...

Based on the view of your PCB it's hard to spot that single possibly bad joint. But what is clearly visible is that it would help to allow more time for the solder to flow through the board on each joint. Some joints look cold/bulging on top of the PCB more than having flowed through it. Be...

Could you give some insight into your implementation of the H63 driver stage in that amplifier? Am curious as it has some serious Miller capacitance I can imagine? Some requirements for a previous stage. What's your measured/estimated max possible peak to peak voltage on the output's grid? And...

There's no build difference between an Osram and GEC L63 as they are the exact same tube from the exact same Brook Green works ; Hammersmith factory. As @leftside correctly noted; the only difference is the sticker that was stuck on it. Branding a tube as it fit the marked was very common and at...

Soo many tubes to try! So little time. Those are EL35's. penthodes The octal brother to the Philips EL5 tube. A great tube on its own and I had to try EL35 because it's one of the few compatible octals with mesh plate anodes. Are they worth hunting, probably not. They got a smooth and open...

A pair of single ended output tubes can be unmatched by 30-50% and the most experienced listener probably won't hear it. It's important to know that the amplification factor of a tube won't change that much if one tests significantly worse compared to the other. As amplification factor mu = gm...

A word on wires and the cores they go around. I personally tend to use Neotech hook-up upocc on a lot of my builds. I also did use it in Aegis. It's a great cable for DIY builds, readily available. Core material. Had an adventure in comparing some on my own Aegis. A very important choice early...

Alternatives are 600V 0,22uf versions. They also fit in the existing holes. Another option could be 0,15uf 400V or 600V. If all else is equal and it fits I personally tend to use the thicker insulation alternative of a cap. So the 600V version in this instance. The 35mm cap length is the...

It's great to see everyone getting along nicely. I'd like to contribute to this sharing philosophy. :) So. For everyone on the fence. I'll do some posts on here for the next coming days/weeks. On how I build this amp and what my experiences where. Where hickups happened and what...

For those in mainland Europe I can wholeheartedly recommend reaching out to http://www.acoustic-dimension.com/ for the Lundahl transformers, Jupiter capacitors and premium quality small parts.

Here's a link to the Lundahl datasheets: Power transformer: https://www.lundahltransformers.com/wp-content/uploads/datasheets/2758.pdf Power supply choke: https://www.lundahltransformers.com/wp-content/uploads/datasheets/2742.pdf Anode chokes...