2pcs Matched tube Shuguang Treasure 300B-Z Vacuum Tube Replace 300B

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2. Price is for one  matched pair.
 
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2pcs Matched tube Shuguang Treasure 300B-Z Vacuum Tube Replace 300B

Item specifics
Type:    Audio Tube
Model:    300B-Z
Brand:    Shuguang
Substition: 300B
Application: tube amplifier
Socket:   4 pins 
Material:Glass

Packaging Details
Unit Type: one matched pair  in paper box
















Factory history and overview

 
1. Built in the year 1958.

2. Start producing 6Z4 tube in 1963.

3. manufactured 3.7 millions tubes in 1965. Including：6Z4、6P1、6A2、6K4、6N1、6N2、6N12P、6P6P、6L6、FU-7、FU-5.

4. 

1971—1979: Designed and produced 6P14P、6P15P、6P17P 6C16、6BK4、6J8P、6P16P、6P18P、6N18P、FU-811、6C41P tubes.

1980—1985: Designed and produced  EL34A、6P16PA、6T51、6T50(7092)、FU-812、GL-211、2A3 6P16P tubes.

1986—1991: Designed and produced KT88、6550、572B、50CA10.

1991—1995: Designed and produced 300B、5AR4、6L6WGB、300BC、KT94.

1996—1999: Designed and produced  EL156、KT77、KT66. and upgraded 300B、KT88、6550、6L6 to: 300B-98、KT88-98、6550-98、5881A。

2000: Designed and produced 12AX7、6P14.

2001: Designed and produced 12AT7、12AU7.

2002: Designed and produced GE6L6、5881A、6BK4C.

2003: Designed and produced 12AX7M、EL34B、300BS-B、300BS-C、EL37.

2004: Designed and produced 2A3B、2A3C、EL84、845B、845C、EL84L.

2005: Designed and produced 7025A、5751、5Y3GT、EL34M、SG-50.

2006: Designed and produced 805A、SG205、6L6WGS、6L6GC.

2007: Designed and produced SG101、UF101.

2008: Designed and produced 6V6GS、EL34HT. and  CV181-Z、6CA7-Z、KT66-Z、2A3C-Z、E、KT88-Z、300B-Z.

2009: Designed and produced GZ34、6V6GTW、6V6GTP.

2010: Designed and produced 12AX7Ⅲ、12BH7、310、EL34BW.

2011: Designed and produced 12AX7Ⅰ、12AX7MB.

2012: Designed and produced 845-T、805A-T、211-T、6CA7-T、CV181-T.

2013: Designed and produced WE300B、WE274，12AX7-T、12AU7-T、KT88-T、6DJ8.

2014: Designed and produced WE845、12AT7-T、6SL7-T.