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Old 23rd October 2009, 05:44 AM   #11
Will is offline Will  Malaysia
diyAudio Member
Join Date: Sep 2001
Location: Kuala Lumpur
Originally Posted by ianl View Post

I am a new member from the Netherlands. I have been lurking and reading the forum for a while now. I started working with tubes a few months ago. I made a few 'sculptures' with nixie tubes, and even designed my own SMPS.

After I became familiar with high voltage it occurred to me that it might be fun to play with other types of tubes. Several members of the NEONIXIE list (great group!) on yahoo highly recommended this forum.

This weekend I went to the tube shop and found some tubes to 'play with'. I got some ECC81 (12AT7), and EL90 (6AQ5A). I also found some small JAN6418 marked as low voltage tubes.

When I got home I googled the 6418 and found
this kit that uses the tube. It looked like a simple place to start and I had all the parts on hand.

I bread-boarded the circuit (just the pre-amp part), but realized that some of the connections were really blurry. Attached is a picture of the circuit. I enhanced some of the connections that were blurry, but obvious (to me). Can someone suggest what might connect to the points circled in red? It's probably really obvious to anyone with experience, but it has me stumped.

The red circle at the top is a 'supply line to nowhere'. The circle at the bottom is a junction with no attachment.

Thank you,


Well did you hook up your breadboard amp to hear what it sounds like?
I'm surprised you used 36V wherelse the original kit specified at 9V anode.
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