These are the extremely rare and impossible to find Dark Brown base variation. Both tested NOS on an Amplitrex AT1000 tube tester with the following results (as photographed): Tube 1- 91/91% ip 100/100% gm Tube 5- 121/126% ip 112/112% gm
These are the extremely rare and impossible to find Dark Brown base variation. Both tested NOS on an Amplitrex AT1000 tube tester with the following results (as photographed): Tube 1- 91/91% ip 100/100% gm Tube 5- 121/126% ip 112/112% gm