push-pull combination preamp-power amplifier
Component tube	rectifier	MJ issue:
6SL7/EL34/EL34/2A3	5Z3	Oct. 1980
6C4/6C4/6BQ5/6BQ5	GZ37	Jan. 1982
5691/5692/WE-350B/PX25	83	Jun. 1986
801A/801A/801A/DA30pp/RCA50	83	Nov. 1986
5691/841(VT51)pp/801A/RCA50	83	Aug. 1987
5691/5692/WE-VT25A/WE300B	WE274A	Jan. 1988
5691pp/5692pp/WE-300B/WE-300B	WE274A	Jun. 1988
5691/EL34/EL34/EL34	GZ34	Apr. 1991
5691/EL34/E406N/46	83	Jun. 1994
5691/EL34/6G-B8	GZ37+GZ34	Sep. 1998
5691/5692/WE-300B/CX350	WE274A+RCA83	Jan. 2003

SE combination preamp-power amplifier
Component tube	rectifier	MJ issue:
5691/42/42/DA60	83	May 1979
5691/6AU6/37/2A3	5Z3	Oct. 1981
12A/12A/12A/12A/RCA50	WE301A	Jan. 1982
5692/5692/6V6G/KT66	83	Jan. 1985
5691/801App/801A/RCA50	83	Jan. 1985
WE101D/WE205F/WE205F/300B/RCA50	83	May 1985
5691/RCA1623/RCA50	83	Nov. 1986
CV5112/7C5/KT63/845	83	Oct. 1994
5691/5692/VV300B/845	5R4	Mar. 1998
5691/5692/845/845	5R4	Aug. 1999
NEW5691/5692/ML6/45/DA30	5Y3	Apr. 2003

Paralell push-pull combination preamp-power amplifier
Component tube	rectifier	MJ issue:
6Z-DH3A/37/37/42	WE301A	July 1982
5691/37/37/37/42	83	Jun. 1983
5691/ECC33/KT66/KT66	GZ37	Jun. 1986
5691/ECC33/42/46	83	Nov. 1986

Phono preamplifier
Power amplifier
Two channel amplifier

Introduction
Index of Sakuma's works