sub micro tubes for a portable headphone amp

dBel84 · 20th March 2010, 04:14 AM

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

poynton · 20th March 2010, 04:35 AM

Hi.

Try this ...

6418 tube preamplifier - Oatley Electronics

Andy

.

dBel84 · 20th March 2010, 04:46 AM

yes, I am aware of this kit. I am looking for tubes..dB

dBel84 · 21st March 2010, 04:01 AM

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.

..dB

20th March 2010, 04:14 AM	#1
dBel84 diyAudio Member Join Date: Jul 2006	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

20th March 2010, 04:35 AM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 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 . __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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20th March 2010, 04:46 AM	#3
dBel84 diyAudio Member Join Date: Jul 2006	yes, I am aware of this kit. I am looking for tubes..dB

21st March 2010, 04:01 AM	#4
dBel84 diyAudio Member Join Date: Jul 2006	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. ..dB