Vacuum Tube Amplifier Practice

Here’s a couple of pages scanned from the tome (RDH4) on an interesting cross-coupled phase splitter/semi-parametric tone control. Page 1 and Page 2. It works rather well, and could be found (albeit slightly adulterated) in my preamp… although not any more.

Here is a simple, 10W triode-wired PP EL34 interstage coupled hifi amp. I use this amp for my computer sound system, and it sounds fabulous.

I made up a high current 12VDC power supply, used to emulate an automobile electrical system. The schematic is here.

Here is a small collection of datasheets I found useful.

Using an LM350 as a current regulator, and info on more current regulated DC filament supplies.

A very ambitious project… scanning in the entirety of Karl Spangenberg’s epic Vacuum Tubes. Click HERE for a single, self-extracting archive file of the jpgs (~70Mb). A nice large PDF file can be found here.

Color codes for typical power transformers.

Here’s a handy Wire Table.

Datasheets for Thordarson Input trannies.

Typical output transformer wire color code.

Amperex 1963 Electron Tube Catalog.

Here’s a guide to typing extended ASCII characters from your Windows Keyboard.

Here’s a quick and dirty low Z bias supply.

Building Your Own Tube Amp — Over the years this has proven to be an immensely popular article. Not that I can take any credit for it, though.. Ralph Power is the man you want to thank!

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