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Old 19th October 2007, 02:04 PM   #1
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Default What to do with these.....

Ive got 20 of these submini 6111's. around $1 each so how could i pass it up. Im thinking of building a two tube hybrid guitar amp head, something like the Nano Head. I was thinking maybe Volume, Tone, and Drive controls. any ideas?

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Old 19th October 2007, 02:11 PM   #2
Yvesm is offline Yvesm  France
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Old 19th October 2007, 04:32 PM   #3
kevinkr is offline kevinkr  United States
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Send them to me for immediate disposal!

You got quite a good deal on them.

They have a mu of 20 so they won't give you the gain of a 12AX7, but could be used in the tone control circuitry, and other places you have indicated.

They are often used in cd players, and tuner solid state to tube conversions as they have just about the right gain, are very quiet, have excellent linearity, and are long lived.

You got quite the deal, typically they go for as much $5 - $7 each, and I've seen them at >$10 USD each although I don't know how many actually get sold at that price.

Worst case you can put them on eBay and make a nice little killing.

Higher mu types like the 5744 (mu of 70, single triode) might also be of interest and are still pretty cheap.
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Old 23rd October 2007, 02:07 PM   #4
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Thanks for the reply! I got them on ebay and noticed the guy selling another lot of 20 with a starting price of 25$. Thats more then twice of my winning bid before shipping! ha!

I guess I have a few winter projects on hand. If anyone has info on places people have used these before in DIY that would be appreciated. So far ive found a phono pre, and a Multi Hybrid Headphone Amp. but I still like the idea of a mini guitar head.

Seeing as this is only my second tube project (first was a soha) Im still a big n00b.
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Old 23rd October 2007, 07:12 PM   #5
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Those would be fun for a stompbox
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Old 23rd October 2007, 07:13 PM   #6
EC8010 is offline EC8010  United Kingdom
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I haven't looked up a data sheet for them, but going by what kevinkr says, they should be very useful - just don't ruin too many learning about valves!
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Old 23rd October 2007, 10:14 PM   #7
Jeb-D. is offline Jeb-D.  United States
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The mu is too low for a stomp box application. So your probably better off giving them to me

In all honesty if you have any interest in trading some of those for 6021's or 6112's, let me know. They would probably do well for tone contols, as the low Rp and high Gm would give low noise. I've yet to hear a submini that didn't sound excellent(ok, some pentodes when triode strapped). They can't handle large voltage, so in amps, their best paired with low Rp output tubes such as 6C33C's, 6AS7G's, ect. That's if you want to run everything off one supply rail which simplifies things.

I'm currently building an OTL using all submini's, except the output tubes of course.
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Old 26th October 2007, 12:56 PM   #8
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i have some 6BF7's with a mu of 35. i'm working on a stompbox. here's what i've got so far... gain is 20 with a distortion of 0.2% wuth .2 volts input, and more like 10% with 0.5V or more input.
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Old 27th October 2007, 02:52 AM   #9
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That's a cool tube. Ultimate mu of a 12AU7 or 6SN7, but twice both the plate and grid (trans)conductance. Moderate heater draw, some of these late tubes are really very applicable. I'm using 6GK5 and 6T4 in different applications, and their goodness is audible.

Use these wee beasties in good health; you scored.

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Old 27th October 2007, 07:23 AM   #10
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haha wow. I just counted and ..... he sent me 21.. It just keeps getting better. A couple of them have slightly oxidized leads... whats a good way to clean them? I heard Coca Cola... that stuff eats teeth..... any other ideas?
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