If you have Technical questions, amp questions or are interested in building an amp I have some very good free sources of information for you.
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 I have a library page with tons of free tube amp building info, projects, sound clips, photo's. Please go here to read up, there is lots of great information here. Check out my Library page.
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 Besides my library page above, the other great source of free information is my tube amp forum. There are lots of experienced helpful people ready to answer your questions 24/7. Click this link to visit my amp forum.  Hoffman Amps Forum
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  Sorry, but it is not possible for me to answer amp questions by email. I have to handle all the parts orders first and that takes up most of the day right there by itself. The main focus here is getting customer orders out the door as fast as possible. 
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 Please examine my web site thoroughly, I spend a lot of time putting information on my web site so that people all over the world can have access to it 24 hours a day. Check out the information sources listed above, most of the time your question can be answered. It also adds to your education on tube amps which is a good thing.
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Thanks,
Doug Hoffman
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Click here to enter the Hoffman Amplifiers tube amp parts catalog
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The Tube amp Library of information
Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips.
There are hundreds of pages of Tube amp information on my library page.
Here is where you can go to ask tube amplifier questions.
You will find a large community of amp builders at the link below.

Please visit my Tube Amplifier Forum