I purchased two of the adapters to use the 6GH8 or 6U8 tubes in my Mark IIIs or Mark IIs. Attached is a photo of one of the adapters in my spare Mark III. I have an appropriate set I use on the 7199 amps but this is the first adapters I have tried on the 6AN8 amps. Nothing wrong with my 6AN8s but wanted to try these.
All the voltages on the circuit board are similar to those from the 6AN8. They sound great. I put them in my regular Mark III and they are playing in the main system now. It will be interesting to compare with the Mark IV, ST 70 and SCA 35 amps now that they all can use the same driver tube.
All the voltages on the circuit board are similar to those from the 6AN8. They sound great. I put them in my regular Mark III and they are playing in the main system now. It will be interesting to compare with the Mark IV, ST 70 and SCA 35 amps now that they all can use the same driver tube.