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Ignition Coil Toobe Amplifier
Ignition Coil Toobe Amplifier
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Old 30th January 2007, 02:01 PM   #1
Mark A. Gulbrandsen is offline Mark A. Gulbrandsen
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Default Ignition Coil Toobe Amplifier

Ok guys.... its a bit hard to start on a cold morning but .this toobe amp that uses an ignition coil certainly is an odditie in itself.... I wonder how it sounds? BTW: The guy that wrote up this little gem seems to dislike buying NOS toobes from now defunct American manufacturers.... Go figure....

Mark
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Old 30th January 2007, 02:17 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Ignition Coil Toobe Amplifier
nice article for noobs
besides that-driving anything (besides grid of next toob ) with 12AX7 is same as driving 50 mosfet gates with one 2SJ109.
go figure
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Old 30th January 2007, 02:22 PM   #3
lt_texan is offline lt_texan  United States
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the mains fuse is labeled "optional"
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Old 30th January 2007, 03:20 PM   #4
Mark A. Gulbrandsen is offline Mark A. Gulbrandsen
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Quote:
the mains fuse is labeled "optional"
Yea... go figure....
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Old 30th January 2007, 04:49 PM   #5
qq is offline qq  United States
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Quote:
BTW: The guy that wrote up this little gem seems to dislike buying NOS toobes from now defunct American manufacturers.... Go figure....
Maybe he didn't want the vast throngs of people trying his project to use up the remaining stock of NOS 12ax7s?
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Old 30th January 2007, 05:36 PM   #6
jrevillug is offline jrevillug  United Kingdom
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Originally posted by qq


Maybe he didn't want the vast throngs of people trying his project to use up the remaining stock of NOS 12ax7s?

This appears to be a part of an electronics course- there would be no point in spending on a NOS 12ax7 when a current production one will work for the demonstration.

Parafeeding the 'OPT' would appear to be a good, if expensive, idea- no high voltage DC on the speaker terminals.

James
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Old 30th January 2007, 06:31 PM   #7
Mark A. Gulbrandsen is offline Mark A. Gulbrandsen
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So which coil would work the best...One from a Model-T, one from a Jaguar, or one from a Mercedes?
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Old 30th January 2007, 06:36 PM   #8
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by Mark A. Gulbrandsen
So which coil would work the best...One from a Model-T, one from a Jaguar, or one from a Mercedes?
No, with a Sovtec tube, only a Lada will provide the correct load.


Andy
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Old 30th January 2007, 07:41 PM   #9
Glenn_G is offline Glenn_G  Australia
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I have seen discusion of the use of two low voltage transformers back to back to produce the HV on this forum. How do you calculate the amperage on the final 115v?
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Old 30th January 2007, 09:07 PM   #10
Dave Cigna is offline Dave Cigna  United States
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I've seen this idea somewhere before, but never tried it. I'm sure I have an ignition coil around here somewhere. If I were more motivated I'd measure the inductance and stepdown ratio...

Anyway, it seems to me that the coil is not really hooked up right. As drawn, the speaker voice coil (along with any interconnecting wire) is riding up and down with the plate of the tube. That's a huge common mode signal that serves no purpose and loads the tube with all of the capacitance to earth.

It makes a lot more sense (to me) to put the small section of the winding (the part that the speaker is connected across) at B+ rather than at the plate of the tube. To make the change just swap the plate and B+ connections in the drawing: connect B+ to the '+' terminal on the ignition coil and connect the plate to the center plug.

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