This is a giant tube. With around 500 grams of weight, definitely this is a heavy weight class. It’s a Pentode with shadow grid to reduce the screen current –...... Read More

I dig some of my collection and find some AZ1 tubes. Basically, I have several tubes, but short word, they are separated into 3 brands, Philips Miniwatt AZ1, Valvo AZ1,...... Read More

I would rather call this as “beauty in the dark”… No longer perfect in terms of construction, slightly off-center for the mesh and triangle, since probably over 70 years old...... Read More

In the middle of the night, after finishing my tube rectifier dual socket modification, I prepare some tube rectifier to test the new socket. I think it’s gonna be nice...... Read More