Matched Quad
Telefunken EL84 6BQ5 Matched Quad - ◇ Bottom - Berlin '50s - '60s - Near NOS
$350.55
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:
B6001405 (B = Berlin, 1 = 1961)
B1202803m (B = Berlin, 2 = 1962)
B lc 04 (B = Berlin, lc = August 1957)
Unknown
GM (Mutual Conductance) test result: 91%/91%/93%/94% 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): 10.25 mA/V - 91% (100% = 11.3 mA/V)
Measured plate current(IA): 46.04 mA - 96% (100% = 48 mA)
Tube 2:
Measured transconductance(GM): 10.25 mA/V - 91% (100% = 11.3 mA/V)
Measured plate current(IA): 44.62 mA - 93% (100% = 48 mA)
Tube 3:
Measured transconductance(GM): 10.5 mA/V - 93% (100% = 11.3 mA/V)
Measured plate current(IA): 47.77 mA - 100% (100% = 48 mA)
Tube 4:
Measured transconductance(GM): 10.62 mA/V - 94% (100% = 11.3 mA/V)
Measured plate current(IA): 43.57 mA - 91% (100% = 48 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
Matched Pair
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)
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.
