FourT6and2
Well-known member
All tubes tested on Maxi-Matcher 2 at 400Vp, -36mA bias.
Nominal current of a new tube: 21mA – 50mA
Minimum transconductance of new tube: 4.0Gm
More photos upon request.
Non-original boxes unless otherwise stated.
All tubes sold "as is". Your test results may vary.
Free uninsured shipping via USPS Flat Rate. Insurance is extra.
PAIR 1
1960s
Short base
Factory Tested "1" (best quality)
Tube 1: 52.8mA, 6.64Gm
Tube 2: 44.4mA, 5.87Gm
Price: $375
PAIR 2
Mesa branded STR 450
"10 AC BLU"
Tube 1: 42.0mA, 5.48Gm
Tube 2: 40.3mA, 5.43Gm
Price: $225
PAIR 3
Ruby branded
Tube 1: 34.0mA, 5.00Gm
Tube 2: 34.3mA, 4.90Gm
Price: $225
PAIR 4
RFT branded
Large base
Original RFT boxes
Tube 1: 30.8mA, 4.69Gm
Tube 2: 28.8mA, 4.59Gm
Price: $250
PAIR 5
RFT branded
Large base
Original RFT boxes
Tube 1: 38.6mA, 5.24Gm
Tube 2: 39.5mA, 5.14Gm
Price: $250
QUAD 1 (CAN BE SPLIT INTO PAIRS)
RFT branded
Large base
Original RFT boxes
Tube 1: 38.0mA, 5.11Gm
Tube 2: 38.2mA, 5.00Gm
Tube 3: 42.0mA, 5.28Gm
Tube 4: 41.7mA, 5.27Gm
Price: $500
QUAD 2
RFT branded
Large base
Original RFT boxes
Data/photo TBD
Price: $500
Nominal current of a new tube: 21mA – 50mA
Minimum transconductance of new tube: 4.0Gm
More photos upon request.
Non-original boxes unless otherwise stated.
All tubes sold "as is". Your test results may vary.
Free uninsured shipping via USPS Flat Rate. Insurance is extra.
PAIR 1
1960s
Short base
Factory Tested "1" (best quality)
Tube 1: 52.8mA, 6.64Gm
Tube 2: 44.4mA, 5.87Gm
Price: $375
PAIR 2
Mesa branded STR 450
"10 AC BLU"
Tube 1: 42.0mA, 5.48Gm
Tube 2: 40.3mA, 5.43Gm
Price: $225
PAIR 3
Ruby branded
Tube 1: 34.0mA, 5.00Gm
Tube 2: 34.3mA, 4.90Gm
Price: $225
PAIR 4
RFT branded
Large base
Original RFT boxes
Tube 1: 30.8mA, 4.69Gm
Tube 2: 28.8mA, 4.59Gm
Price: $250
PAIR 5
RFT branded
Large base
Original RFT boxes
Tube 1: 38.6mA, 5.24Gm
Tube 2: 39.5mA, 5.14Gm
Price: $250
QUAD 1 (CAN BE SPLIT INTO PAIRS)
RFT branded
Large base
Original RFT boxes
Tube 1: 38.0mA, 5.11Gm
Tube 2: 38.2mA, 5.00Gm
Tube 3: 42.0mA, 5.28Gm
Tube 4: 41.7mA, 5.27Gm
Price: $500
QUAD 2
RFT branded
Large base
Original RFT boxes
Data/photo TBD
Price: $500