Has anyone created a list or site for transistors or circuits to replace tubes?

Just wondering, why would you want to do that when most tubes are easy to come by?

:Has anyone created a list or site for transistors or circuits to replace tubes?

Rectifier tubes can be replaced with diodes or plug-in units available from AES www.tubesandmore.com Would need to deal with higher B+ and possibly coming up too fast, though?

But I think most amplifier and detector tubes would take dozens of transistors and passive components to make up a one-to-one replacement that could be plugged into a tube socket. To start with, a tube's plate and grid voltages are way off from what typical solid-state circuits need to see, biasing is different, and performance is quite different.

If I were going to try, my first choice would be to use an A-D converter on the tube's grid input, send the digitized signal to a microprocessor programmed to simulate the tube's performance, and then a D-A for the output. Also, need a regulated power supply that perhaps could be derived from the filament ckt? Not sure how to interface the output to the plate ckt.

I'm not aware of a "list or site" on this subject.

:Just wondering, why would you want to do that when most tubes are easy to come by?
:
::Has anyone created a list or site for transistors or circuits to replace tubes?

The real old tubes are getting super hard to find and even though some claim to be NOS I have had some bad ones. Even some that have tested good on my testers are no good when in the set.

Randy, please tell us the specific tube types you are looking for.

:The real old tubes are getting super hard to find and even though some claim to be NOS I have had some bad ones. Even some that have tested good on my testers are no good when in the set.

Usually it's the other way around. A tube will test "?" on a tube tester, but work fine in a radio.

:The real old tubes are getting super hard to find and even though some claim to be NOS I have had some bad ones. Even some that have tested good on my testers are no good when in the set.