Jon Anderson just let me know about an amp he’s built using 6112 and 5902 subminiature tubes. The 6112 is a dual triode (mu around 70, I think, like a 12AT7, and the 5902 is a power pentode. He’s posted a schematic and sound clips – it’s sounds great! Go check it out.
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This pedal update has an interesting twist – the site Runoff Groove has taken several classic tube circuits and adapted them as pedals using MOSFETs. MOSFETs actually behave in a very triode-like manner.
They’ve taken the Matchless DC/30 design and adapted it as the Matchbox, the Dumble Overdrive circuit as the Umble, and the Boogie Mark I as the Uno. In fact, there are even more – check out their articles page.
These look pretty interesting, and I’ll probably build one, or even all three, of them at some point.
Ted Woods also tipped me off to another tube pedal, the Stephenson Amps Stage Hog, which uses a 12AX7 and a 12AU7 and can be operated as a tube distortion pedal or a practice amp.
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Sorry for the couple of days that navigation was broken. An automated cleanup process deleted the .htaccess files, so all the redirects weren’t functioning for a bit. It’s been fixed.
We now return you to your regularly scheduled soldering.
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If you use Visio for drawing schematics and layouts, I just uploaded a huge collection of diagram components for both. It’s a ZIP file full of Visio files which you can copy & paste out of. Don’t miss the fact that many have multiple pages.
This used to be up on my old site years ago – thanks to Carl for reminding me of it!
- Visio Parts (it’s in the Tools section)
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I’ve got a huge backlog of unsorted links (it’s been over 14 years since browser bookmarks were invented – why do bookmark managers still suck?), which I’m going to start posting here as categorized entries.
Today, we’ve got a few low-volume links.
- Stephen Keller’s milliAmp is an amp made from a single 12DW7, which if I remember right is essentially 1/2 a 12AX7 and 1/2 a 12AU7 in a single 9-pin tube. Stephen also has some interesting articles and schematics on his home page. Cool stuff.
- FireZog, a schematic for adding a line out to the FireFly
- A low voltage design at www.sopht.ca, using car tubes which run on 30V B+. There’s also an ax84 bbs thread about it.
DennisF built a HotBox-inspired pedal, which includes a schematic and a clean layout diagram. Looks cool!