i have used rg400s one for each block (makes placing the amps closer to the speakers easier). It had a slight improvement in the sound. I found the rgs much better on the front end.
I noticed what you were using for tubes....this is where you can make these amps sing. I have tried a host of input and output tubes. Put some good used or nos (depends on how much you want to spend) in these amps. I found that tunsols (6550s) are the best outputs. The inputs give you more bang for the buck. Rca (reasonalbe) make a big difference!! Masushitas (probably spelled wrong) Ats are great!(each tube has a slight sonic sig select to your taste) Spend the money on tubes svte 6550s really do not do justice to these amps. If you are using stock input...you will be shocked at the improvement when you change.
as alway imo
Jim
I noticed what you were using for tubes....this is where you can make these amps sing. I have tried a host of input and output tubes. Put some good used or nos (depends on how much you want to spend) in these amps. I found that tunsols (6550s) are the best outputs. The inputs give you more bang for the buck. Rca (reasonalbe) make a big difference!! Masushitas (probably spelled wrong) Ats are great!(each tube has a slight sonic sig select to your taste) Spend the money on tubes svte 6550s really do not do justice to these amps. If you are using stock input...you will be shocked at the improvement when you change.
as alway imo
Jim