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Thanks for the review. Looks like a good low cost amp with lots of flexibility.

Noticed an Opal2 in my latest PE catalog.

Large Advent speakers and Advent 300 receiver. And Hafler DH200 that brought power to the masses (for a little work).

Thanks for everyone's responses. I ordered all parts from Soundimports. Cost was lower even with shipping than Madisound or Solen and I got all parts from one place. Now to reread 40 pages of posts and get started on cabinets and birdseye maple veneer.

Does anyone have a source for the project woofer and tweeter? Solen and Madisound are OOS. Thanks

For two channels the minimum number of tubes. These are called single ended amps.

A fully tubed stereo amp would have at least 3 tubes. One driver tube like 12AX7 and 2 output tubes like EL34/KT88/6BQ5. An amp like this will have 5 to 25 watts per channel. The term hybrid usually means tube driver and solid state output. Also you are not likely to find any 100 watt amps for...

Tube amps usually refer to amps with Tube output stages. These amps have a tube driver (preamp section) and solid state amplification. If you want tube sound the amp section needs to be tubes.

Probably but it would be used. Tube amps will require maintenance in many cases. Also you would need to determine how much power you need. Power is much more costly per watt than in solid state amps. The Yaqin discussed here has about 5 watts of output. You will also need efficient speakers...

Two different amps are shown in these pictures. Look closely at the differences in the wiring. One amp is missing the B+ voltage power supply caps. Also the power supply does not follow good design practice for the B+ voltage. For example the are no resistors in power supply to form RC filter...