2 x 9 Pin Adapters - 6U8A to 7199 plus 2 x NOS Jan Phillips 6U8A/6EA8 Dyna ST-70
2 X high quality socket adapters allows using a 6U8A/6EA8 or 6GH8A to replace the 7199 in the Dynaco ST-70. Compare to the price of 2 X 7199 tubes, if good ones can be found.