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Old 20th March 2010, 04:14 AM   #1
dBel84 is offline dBel84  United States
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Default sub micro tubes for a portable headphone amp

I am looking for recommendations for submicro tubes that could be used for portable application. Something along the lines of the 6418 pentode which has a max plate voltage of 30V and a filament supply of 1.2V. If this is the best option, so be it but I wanted to see if there were any others that might fit the bill too.

..dB
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Old 20th March 2010, 04:35 AM   #2
poynton is offline poynton  United Kingdom
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Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Hi.

Try this ...


6418 tube preamplifier - Oatley Electronics



Andy


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Old 20th March 2010, 04:46 AM   #3
dBel84 is offline dBel84  United States
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yes, I am aware of this kit. I am looking for tubes..dB
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Old 21st March 2010, 04:01 AM   #4
dBel84 is offline dBel84  United States
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I found a great site with useful information on these submini tubes. Now I need to play with some plate curves to see what is practical.

I was initially going to go the simple chip hybrid route but I saw these tiny audio transformers and that got me thinking about other possibilities. I will have to see if this actually leads anywhere but it might be fun.

Finally , all this submini thinking forced me to dig out an old "back burner" project ( and the fact that I stumbled upon it while clearing out my parts bin ) , so I quickly cased it up today - it is unfortunately not low voltage but runs on a B+ of 160V, dual rails for the discrete buffer are + - 18V and heaters run in series for 12.6V. Not quite ready to fire up and listen but I did test the individual units to make sure they were working electrically.

A few images.

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..dB
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