This is a an amplifier that we did not even think of building! I've been keep a pair of EL152 power pentode from Telefunken for quite some time. It was more for collection rather than building use. I was waiting for a free time that has yet to come to put the Telefunken EL152 into good use.
Just so happened that I have a good friend that wanted to build a tube amplifier by himself. I've designed the amplifier for him with 6B4G tube in mind for a 3.5W Single Ended DHT integrated. It did not get materialized as he moved to Singapore halfway during the process and now migrated to Australia.
The whole set of transformers, chassis and components were stored at my place for at least 3-4 years if my memory serves me right. I have been bugging him to bring it back to complete it but it just never moved since Australia is quite far away from my place. Things got dragged on until several months ago where we decided to put it into action by building it ourselves using all the materials that were meant for 6B4G.
The Telefunken power tube can output more power but due to the VA and voltages made for the 6B4G, it was generating only ~3W output. Anyhow, we were still quite impressed at the sound it produces. One day, perhaps, we will make the right power transformer to be used with Telefunken EL152 to fully optimize the circuit and output power.
Time for some pictures!
For amplifier pervs, here are the internal pictures:
J&K Audio Design