tube preamp using submini tube

[aletheian]

Are those IERC submini sheilds? I never knew that they made them!

[unclejed613]

i wish i had the aluminum block, but i saw it in a local surplus store.
i like those sockets...... i was thinking of using TO-5 round op amp sockets. i do have a few of the mounting clips, they aren't as efficient as the aluminum block, but they do dissipate some heat.

vertical mounting might be somewhat problematic in a guitar. i could mount it at a 45deg angle. guitars spend some time on stands while not being played, so if mounted vertically for playing, the tube would spend some time horizontally with the filament lit. i'm going with a cascaded preamp, since it has more gain and fewer parts. the diff amp required either a second dual triode (more heater current, and heat) or a MOSFET as an output stage, and had terrible frequency response. tube input op amps don't have a lot of bandwidth. the other option is to use a single triode as the input stage to get the characteristic harmonic content of a tube stage, then follow up with an op amp for the gain (but that would be cheating...)


i'll see if the surplus store has some of those sockets in your pix

the other alternative for a socket is to take "universal" ic socket strips and cut them into 4 2pin sections, arrange them in a stop-sign shape and glue them together to form a round socket