Russian mini tubes for stompboxes?

[zjokka]

I recently acquired a Hammond organ T-series after seeing this page with incredible simple mods for these organs on www.keyboardpartner.de . You can read all about that there, interesting and simple stuf.

The final mod takes the organ from solid state to valve state by replacing the pcb. This pcb has three small russian tubes on it that have an incredible story to them:


Want that sweet tube sound for your transistorized organ? Build a real tube amplifier for your T-series spinet!

But wait... don't those tubes require a letal high anode voltage and a big transformer for heating? True for most, but not for mine. I found some miniature tubes that work perfectly with the organ's 24V power supply, they need only a few milliamps for heating. How that?

Let the Russians do the work!

Remember russian pilot Victor Belenko who defected to Japan in his MIG-25 Foxbat fighter back in 1976? U.S. military officials were stunned when they examined what they thought was the most advanced fighter jet in the world. The Russians, it turned out, were still using old-fashioned vacuum tubes instead of state-of-the-art transistors and computer chips. For all their vaunted military reputation, the Soviets seemed incredibly backward. Eventually though, it dawned on the Americans that the Soviets had figured out the old tubes would be less vulnerable to the electro-magnetic pulse of a nuclear blast than some newer components. The MIG-25 fighter was equipped with thousands of miniature vacuum tubes, and most of them are still available, since the russians literally made millions of them for military stock. Data of these tubes is pretty hard to find on the web, because the cyrillic transcription of their numbering is not consistent. Kindly people here in Europe have collected them, and some can be found at Elektronikinfo or at Franz Hambergers Röhrentabellen. Any preconceptions against russian quality? Look: These tube were designed to work in a combat fighter even at a nuclear bomp drop. Or ask an audiophool for the reputation of the russian 6C33 power triode, the one which was used in the MIG's power supply

http://www.keyboardpartner.de/hammond/t-mod-skill4.htm

I really was wondering, would they be useful for tube based stompboxes? Maybe they work also at even lower voltages, the Hammond just has 24V so they started from that, it seem...

ZJ

[bradd lustfünd]

http://www.diystompboxes.com/smfforum/index.php?topic=22488.0

These look like the ones:


I guess all that's needed is for folks to use 'em!

[cakeworks]

oh my! Does this make a stompbox-sized tube overdrive quite possible?

[bradd lustfünd]

Well...if they're good enough for a fighter jet... 

The 6088 is another submini that's worth a look.  It was designed for low voltage, wearable (!) applications:
http://frank.pocnet.net/sheets/138/6/6088.pdf

So too was the 533AX:
http://www.mif.pg.gda.pl/homepages/frank/sheets/138/c/CK533AX.pdf

This is a cool battery powered prototype tube amp that uses the above tube:
http://www.dogstar.dantimax.dk/tubestuf/gallery4.htm#bear

[bancika]

6021 are the ones used in Seymour Duncan SFX-3 twin tube. You can find those on eBay easily, but they are not so great, about as 12AU7

[zjokka]

thanks for the links bradd!

especially the thread, though it is indecesive as to the real sonic possibilities of these tubes. The discussion in the thread decided to need different stages, and so does carsten's design for the organ tube preamp. it's really meant to overdrive, but probably the input on the organ preamp is a little hotter than a guitar into a stompbox.

will be looking into this matter again when I get to modding the preamp. was so excited bout my find that I didn't use the search function, should have known better. this forum really leaves no stone unturned...

zj

[A.S.P.]

6C33C...