Hypothetical solution for reducing V output from mismatched 7199 tubes using 1kOhm trim pot. Battery represents 7199 tube output. 1kOhm trim pot provides 0-25% reduction of V. 7199 tubes are becoming scarce. "Matched" sets of tubes are almost non-existent. 7199 tubes were used as left and right channel drivers in antique tube stereo amplifiers. This hypothetical solution might be employed in stereo units that cannot accept 6U8A driver tubes.
