QUAD 405 similar AMP

[VeniaSL]

Hi!
Are anyone know similar to QUAD 405 amplifiers with based on the same current-dumping principle as the 405 ?
commercial production 1975 - 1990

 

[bosedtobosed]

the 306 606 909 are similar

 

[VeniaSL]

"based on the same current-dumping principle as the 405"
https://www.dadaelectronics.eu/uplo...nt-Dumping-explained-by-Peter-Walker-1975.pdf
https://www.diyaudio.com/community/threads/peter-walker-and-his-current-dumping-principle.326904/
https://www.google.com/imgres?imgur...2ahUKEwjovJ2QhruBAxUZAxAIHdk0ASQQMygAegQIARBO