Recent content by L0rdGwyn

Sorry, couldn't tell you, I've never owned an EL39.

Generally speaking, as it isn't always the case, these higher power tubes have higher transconductance, which in a cathode follower design means lower distortion, higher bandwidth, lower output impedance. It's the same reason pass regulators tubes are often used in OTL circuits, they are high...

Well the gain is very low relative to a 6SL7, and given the topology of the output stage, the amp requires a high gain input tube for any significant amount of power output. If using with insensitive headphones, they will be okay from a gain standpoint. The other concern is the core airgap of...

All I can say is probably, but not definitely. These very old pentodes don't tend to have triode curves in their datasheets, which are needed for me to know where the tube will bias. If someone can find triode curves for the 4689 or an equivalent tube, I could say. If a DIYer got a pair, they...

Well hey, making it into Stereophile wasn't necessarily on the bucket list but I'm going to add it right now and check it off!

All I can say is it's a work in progress! Wow, you're kidding right? Totally out of the loop on this (I'm not subscribed). Edit: found it, very cool, thanks for the heads up @bcowen !

I use both. I've written about it on the forum before, probably extensively at this point. Tube rectifiers do have some technical advantages in some cases, but those advantages can be replicated with solid state circuitry. For instance, indirectly heated rectifiers have built in soft start...

It's probably fine, but yes, one channel was out as the tube was in the incorrect orientation. There is a notch in the tube socket and the tube base so that they can only go in in one orientation. However, in some tubes the notch gets worn out and it can then go in the socket in the incorrect...

Well if the tube isn't the socket in the correct orientation, it won't operate as intended. This can be a big problem depending on how the pins are reconfigured, often times it causes a short. But if the tube was cool then you might have avoided a problem.

These are all just KT88 analogs with higher maximum plate dissipation ratings, so theoretically they should bias just like a KT88 in Aegis.

Yes, it is a 5U4 equivalent, so you could use it with an adapter.

Sorry, but no plans for a kit.

No guarantees there yet, still a lot of work to be done, but I have not been idle!

Some of those high impedance LCD drivers seem to do very well with high output impedance amplifiers. I don't know the exact output impedance of the GOTL with 6336 (could estimate with LTSpice), but I'd imagine it is relatively high. Side note, Head-Fi recently made changes where you cannot...

Hey, not hard to believe at all, my 6336 OTL is the best I've heard. I have to warn you in advance though that I'm not sharing schematics of it. The 6336 is essentially two 6AS7G combined into a single tube, higher transconductance, higher current capability. Likewise, the very high...