Here is a very rare Altec Lancing Vacuum tube 230 B Console Mixer.  It uses the Rare peerless 4629 Input Transformers and the 12266 Transformer.  I bought this from a studio about 15 years ago.  I was told it was working when taken out of service.  It looks like the Engineer built a tube power supply for it as you can see in the picture.  This unit is sold as is.$225 for US shipping$395 for International shipping