Telefunken EL84 6BQ5 ◇ Bottom Berlin

Telefunken EL84 6BQ5 ◇ Bottom Matched Pair - Berlin 1959 - Test Strong

$ 197.8

 

Telefunken EL84 6BQ5 Matched Quad - ◇ Bottom - Berlin 1960s - Test NOS

$ 428.25

Product Summary

Model: 1950s - 60s Telefunken EL84 6BQ5 (Made in Germany)

Soundlumia Tube Sound Rating: 9.5/10 - Outstanding 

1950s - 60s Berlin, Germany production - Unparalleled sound characteristics and superb build quality - True holographic sound stage with layered details and ultra clarity

Date codes: 

B 6109606 ( B = Berlin, 9 = 1969 )

B 7004408 ( B = Berlin, 4 = 1964 )

B 5216008 ( B = Berlin, 6 = 1966 )

B 201733X ( B = Berlin, 7 = 1967 )

Silkscreen: 90% - 95%

Packaging: NEW white tube boxes.

 

Professional Tube Testing

This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: 

Tube 1: 

Measured transconductance(GM): 10.75 mA/V - 95% (100% = 11.3 mA/V)

Measured plate current(IA): 43.72 mA - 91% (100% = 48 mA)

Tube 2: 

Measured transconductance(GM): 11.5 mA/V - 102% (100% = 11.3 mA/V)

Measured plate current(IA): 47.47 mA - 99% (100% = 48 mA)

Tube 3: 

Measured transconductance(GM): 11.5 mA/V - 102% (100% = 11.3 mA/V)

Measured plate current(IA): 55.42 mA - 115% (100% = 48 mA)

Tube 4: 

Measured transconductance(GM): 11.37 mA/V - 101% (100% = 11.3 mA/V)

Measured plate current(IA): 51.29 mA - 107% (100% = 48 mA)

 

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.

Matched Pair  ****SOLD****

Telefunken EL84 6BQ5 Matched Pair - ◇ Bottom - Berlin 1963/64 - Near NOS

$ 191.00

Product Summary 

Model: 1963-64 Telefunken EL84 6BQ5 (Made in Germany)

Soundlumia Tube Sound Rating: 9.5/10 - Outstanding 

Early 1960s Berlin, Germany production - Unparalleled sound characteristics and superb build quality - True holographic sound stage with layered details and ultra clarity

Date codes: 

B028332x (B = Berlin, 3 = 1963)

B3014208 (B = Berlin, 4 = 1964)

GM (Mutual Conductance) test result: 94%/97% of NOS/NEW

Silkscreen: 90% - 95%

Packaging: NEW white tube boxes.

Professional Tube Testing

This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: 

Tube 1: 

Measured transconductance(GM): 10.63 mA/V - 94% (100% = 11.3 mA/V)

Measured plate current(IA): 45.37 mA - 95% (100% = 48 mA)

Tube 2: 

Measured transconductance(GM): 11 mA/V - 97% (100% = 11.3 mA/V)

Measured plate current(IA): 50.54 mA - 105% (100% = 48 mA)

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.

'69 Matching codes (Strong) ****SOLD****

Telefunken EL84 6BQ5 Matched Pair - ◇ Bottom - Berlin '69 - Same code – Strong

$153.30

Product Summary

Model: 1969 Telefunken EL84 6BQ5 (Made in Germany)

Soundlumia Tube Sound Rating: 9.5/10 - Outstanding 

1960s Berlin, Germany production - Unparalleled sound characteristics and superb build quality - True holographic sound stage with layered details and ultra clarity

Date codes: 

B5009506 (B = Berlin, 9 = 1969) 

B5009506 (B = Berlin, 9 = 1969) 

GM (Mutual Conductance) test result: 74%/72% of NOS/NEW

Silkscreen: 90% - 95%

Packaging: NEW white tube boxes.

Professional Tube Testing

This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: 

Tube 1: 

Measured transconductance(GM): 8.38 mA/V - 74% (100% = 11.3 mA/V)

Measured plate current(IA): 35.54 mA - 74% (100% = 48 mA)

Tube 2: 

Measured transconductance(GM): 8.12 mA/V - 72% (100% = 11.3 mA/V)

Measured plate current(IA): 35.92 mA - 75% (100% = 48 mA)

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.