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Old 10th September 2008, 02:35 AM   #21
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Do you have any you would want to sell?
I also have a small bag (10 - 20) of loose nuvistors and 2 or 3 new ones. Again they are in the warehouse. I will look for them this weekend. I gave up on nuvistors since they are not cheap and sockets are hard to find. Check out old Tektronix plug ins. My experiments revealed some serious microphonics, but this was several years ago (like 20).

I have a bunch of sub mini tubes like the ones used in these tiny amps. You can stuff them into the old 8 pin IC sockets made for the op amps in the round metal can. I fried one before it would put out a watt. No glow, it just died. I am experimenting with them for hybrid amp use. They are also just the ticket for a top secret guitar preamp that is mounted IN the guitar. OOPS, I didn't say that.
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Old 10th September 2008, 05:15 AM   #22
poynton is offline poynton  United Kingdom
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Originally posted by tubelab.com


........They are also just the ticket for a top secret guitar preamp that is mounted IN the guitar. OOPS, I didn't say that.

Not that 'top secret guitar preamp project'?

I read about it last week on the net !!

Andy
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Old 10th September 2008, 11:17 AM   #23
gerd is offline gerd  Germany
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Quote:
Originally posted by poynton
Cheating ? Yes !

Must include the psu as well.



Andy


hi, you are living in a free country, you can simply build a smaller Amp at any time...


Gerd
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Old 10th September 2008, 11:41 AM   #24
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Default Smallest valve amp

they made tube hearing-aids from the early 1950's ( if that counts )

http://cgi.ebay.com/Vintage-1950-75-...2em118Q2el1247

These're also *very* expensive....

From the description:

"in the case it measures 3-1/8''x6-1/2''x9-1/2'' and it weighs 5 pounds"

I'd say you'd need 2 x of these for Stereo


El Gippo
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Old 10th September 2008, 12:33 PM   #25
gerd is offline gerd  Germany
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Quote:
Originally posted by kuroguy
Saw this one a while back. It too has a separate power supply.

http://www.jogis-roehrenbude.de/Lese...rmann-Mini.htm

this was my inspiration to build the Kolibri.
Herrmans amp was some smaller than a CD sleeve, and I made it some smaller than a MC sleeve

The OPT´s are the smallest possible types for the desired quality. If I would use smaller cores I can´t get the -3dB at 25Hz.

Now we can wait for the next version from nhuwar, smaller than a minidisk ???

Gerd
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Old 10th September 2008, 12:53 PM   #26
aurche is offline aurche  Bulgaria
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WOW, Is it posible to make and OTL, Low voltage 1W Mini Amp with findable tubes?
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Old 10th September 2008, 04:01 PM   #27
awedio is offline awedio  United States
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Among the smallest, undoubtedly the coolest!!!

http://www.impamp.com/

Can't believe no-one else posted this yet... Click on the pic for more images and videos.
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Old 11th September 2008, 01:39 PM   #28
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Originally posted by poynton
Cheating ? Yes !

Must include the psu as well.



Andy
I agree.
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Old 11th September 2008, 01:58 PM   #29
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The Kolibri is WAY prettier & sexier than the impamp.

I'm inspired! I must go see what's in the box of bits.......
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Old 11th September 2008, 02:02 PM   #30
poynton is offline poynton  United Kingdom
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The impamp also has an external psu.

It is also lacking a useable volume control.

andy
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