Get 6J1 Tube Preamp Schematic Pictures. I bought one as an example piece for some hackaday articles about audio, and since it's. Set el84 tube amp diy project.

6J1 Tube PreAmplifier Case Pre-amp Headphone amp preamp ... from s3-ap-southeast-1.amazonaws.com

For preamplifer use tubes can work well. So i decided to buy a cheap chinese tube amp, take it apart, draw a schematic, design a new pcb and make it again, hopefully slightly better. Of course, i had to try and get a schematic for it too.

I'd like the first op amp set up so that the input gain can be adjusted via a trim pot.

This is an inexpensive tube amplifier that can be purchased from auction. I hope to be able to extend this little collection with time, so check back for updates. Kittyhawk → quatro tube preamp. Schematic (all resistors ½w unless otherwise marked, all capacitors are 200v and the operation the schematic is shown in fig.