[swedishhatfaction]

Quote:

Originally Posted by Logistic /img/forum/go_quote.gif If you want to build this version, you have to make some small changes - R1/R7 - 44k R5/R11 - 4K R2/R8 - 330K R4/R10 - 180K You will have to use an octal socket, and here are the conversions from the seven pin socket in the original circuit diagram: 1,2 -> 6 5,6 -> 2 3,4 -> 7,8 7->3 Ground pins 4 and 5. You will also have to ground pin 1 which is for the metal casing. It is probably a good idea to ground pin 1 with a separate path to ground from the heaters (pins 7,8). That way if the ground connection for the heaters breaks for whatever reason you don't see that voltage on the tubes. Using 2" heatsinks is also recommended since the heaters are running at 12V instead of 19V.

Cheap alternative to the 19J6. I used the 12SR7 (which have the black metal casing).