6L6GCM-STR, Redbase, Tube Amp Doctor, Matched Vacuum Tube, Matched Pair

The TAD 6L6GCM-STR REDBASE is Tube Amp Doctor's latest 6L6GC; designed and built to be the best 6L6 type tube ever manufactured. A high claim, but Tube Amp Doctor is sure that they have achieved exactly that.

In terms of sound, the TAD 6L6GCM-STR REDBASE produces the powerful but always defined bass response known from the legendary american built NOS RCA 6L6GC, with clear, unobtrusive and yet transparent highs. In every setting, the TAD 6L6GCM-STR REDBASE responds directly and with noticeable dynamics, from buttery soft and warm to powerful and brutal without losing any details or depth.

This makes the TAD 6L6GCM-STR an effective upgrade for every amplifier using 6L6GC or 5881 tubes; also replaces any EL37, CV586, VT115A, 6L6GA, 6L6GB, 6L6WGB, 6L6WGC, STR-440, STR-454, 6p3p, 6p3s, 6p3s-e etc.

The TAD 6L6GCM-STR REDBASE combines the structural advantages of the robust American Philips / Sylvania 6L6GC, also known as MESA 6L6GC-STR415, and the sound quality of the legendary RCA 6L6GC tubes. Silky highs, defined, deep bass and lots of headroom recommend the TAD 6L6GCM-STR REDBASE for lively clean sounds as well as a powerful broadband power amplifier for multi-channel amps.

The new TAD Redbase series combines the latest manufacturing technologies with traditional design and flawless quality. The TAD Redbase series is exclusively built on a TAD production line that has been optimized especially for the TAD Redbase series. At TAD in Germany, the tubes of the STR series receive a special, additional burn-in treatment and formatting process in preparation for the TAD Premium.Matching, which optimizes the quality of the cathode emission and opens up an exceptionally detailed sound structure.

The Classic 6L6 Sound - Excellent Tone and Maximum Lifetime!

Q: When does a power tube become a Premium Selected power tube?
A: All power tubes labeled Premium Selected have passed the following tests:

• Plate Current (PC) and Amplification (TC)
• Low Noise Test
• Microphonic Test
• Sonic Tests
• Shock Tests
• Listening Tests
• Shorts & Leakage Tests

Product Measurements

Total Height: 109 mm
Base Width: 35 mm
Envelope Width: 38 mm
Envelope Height: 95 mm
Min. Heater Voltage (AC or DC): 5.7 V
Nom. Heater Voltage (AC or DC): 6.3 V
Max. Heater Voltage (AC or DC): 6.9 V
Heater Current: 0.9 A
Cathode: Oxide-coated, unipotential
Max. Cathode-to-heater potential: 200 V
Max. Grid no.1 to cathode and grid no.3, grid no.2, base sleeve and heater: <14 pF
Max. Plate to cathode and grid no.3, grid no.2, base sleeve and heater: <0.8 pF
Max. Grid no.1 to plate: <2.1 pF
Operating Position: preferably vertical
Base: JEDEC #8ET, octal, 8-pin
Cooling: Convection
Approximate net weight: 55 g (1.94 oz.)
Max. DC plate voltage: 550 V
Max. Grid no.2 DC (screen) voltage: 500 V
Max. Grid no.1 (control) voltage: -100 V
Max. DC cathode current: 180 mA
Max. Plate dissipation: 30 W
Max. Grid no.2 DC (screen) dissipation: 5 W
Max. Bulb temperature (surface hottest point): 250° C
Typ. Plate Voltage: 350 V
Typ. Grid 2 Screen Voltage: 250 V
Typ. Grid 1 Control Voltage: -18 V
Typ. Peak AF Grid 1 Control Voltage: 18 V
Typ. Zero Signal Plate Current: 54 mA
Typ. Maximum Signal Plate Current: 66 mA
Typ. Zero Signal Grid 2 Screen Current (avg): 2.0 mA
Typ. Transconductance (nominal): 5,300 mS
Typ. Load Resistance: 4200 Ohms
Typ. Output Power at 14% distortion: 8.5 W