Spark Gap 2: New Low-Voltage Tube Overdrive

[amptramp]

The device in the picture is longer than a 6AL5, so a real one would make less protrusion out the side.  Unless this is studio equipment, you should have a protective cover over the tubes because roadies are part gorilla.

[merlinb]

The device in the picture is longer than a 6AL5, so a real one would make less protrusion out the side.

I've see a lot less of the stubby-bottle 6AL5s on the market these days (from my perspective in the UK), which is a shame as they sure are cute! Maybe the stubby ones were more common in America, I don't know.

[stallik]

I ordered a couple of nos EB91's from flea bay and they arrived this morning.
Siemens branded, short, stubby, dead cute. Rethinking how I'd lay this one out and which enclosure to use.

[PRR]

Rethinking how I'd lay this one out

If you hadn't already got tubes, I'd point to 6JU8 (or 8JU8), quad vacuum diodes (2 series pairs) in a single bottle on the 9-pin base/socket more common in g-amp parts boxes. 5 bucks many places ($37 in the rip-off stores). I bet like 6AL6 these are all re-bottled 6H6 guts.