About the amplifier designs of Dipl. Ing J. Leven, Germany.
1. Contact Mr. Leven
The circuit diagrams provided here, are a private project of Mr. Leven. If you have any questions about this, you can contact Mr. Leven directly. Please take the email address from this circuit diagram (go to 520B-Ultimate if you want to see all of it) .
2. Sales of tubes and transformers
This website offers nothing for sale. Sales is via another website: www.jacmusic.com
3. Contact other users:
You will find more users at the Emssionlabs private group at Facebook. This is a private group, where many users present their projects.