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

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

Tube Amp Doctor (TAD)
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Starting at: $42.95
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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
SKU:
T-6L6GCM-RB-TAD
Item ID:
045219
Brand:
Tube Amp Doctor (TAD)
Type:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
SingleT-6L6GCM-RB-TAD4251594918493
Matched PairT-6L6GCM-RB-TAD-MP
Matched QuadT-6L6GCM-RB-TAD-MQ
Product Measurements by Type
Approximate net weightSingle versionT-6L6GCM-RB-TAD55 g (1.94 oz.)
BaseSingle versionT-6L6GCM-RB-TADJEDEC #8ET, octal, 8-pin
Base WidthSingle versionT-6L6GCM-RB-TAD35 mm
CathodeSingle versionT-6L6GCM-RB-TADOxide-coated, unipotential
CoolingSingle versionT-6L6GCM-RB-TADConvection
Envelope HeightSingle versionT-6L6GCM-RB-TAD95 mm
Envelope WidthSingle versionT-6L6GCM-RB-TAD38 mm
Heater CurrentSingle versionT-6L6GCM-RB-TAD0.9 A
Max. Bulb temperature (surface hottest point)Single versionT-6L6GCM-RB-TAD250° C
Max. Cathode-to-heater potentialSingle versionT-6L6GCM-RB-TAD200 V
Max. DC cathode currentSingle versionT-6L6GCM-RB-TAD180 mA
Max. DC plate voltageSingle versionT-6L6GCM-RB-TAD550 V
Max. Grid no.1 (control) voltageSingle versionT-6L6GCM-RB-TAD-100 V
Max. Grid no.1 to cathode and grid no.3, grid no.2, base sleeve and heaterSingle versionT-6L6GCM-RB-TAD<14 pF
Max. Grid no.1 to plateSingle versionT-6L6GCM-RB-TAD<2.1 pF
Max. Grid no.2 DC (screen) dissipationSingle versionT-6L6GCM-RB-TAD5 W
Max. Grid no.2 DC (screen) voltageSingle versionT-6L6GCM-RB-TAD500 V
Max. Heater Voltage (AC or DC)Single versionT-6L6GCM-RB-TAD6.9 V
Max. Plate dissipationSingle versionT-6L6GCM-RB-TAD30 W
Max. Plate to cathode and grid no.3, grid no.2, base sleeve and heaterSingle versionT-6L6GCM-RB-TAD<0.8 pF
Min. Heater Voltage (AC or DC)Single versionT-6L6GCM-RB-TAD5.7 V
Nom. Heater Voltage (AC or DC)Single versionT-6L6GCM-RB-TAD6.3 V
Operating PositionSingle versionT-6L6GCM-RB-TADpreferably vertical
Total HeightSingle versionT-6L6GCM-RB-TAD109 mm
Typ. Grid 1 Control VoltageSingle versionT-6L6GCM-RB-TAD-18 V
Typ. Grid 2 Screen VoltageSingle versionT-6L6GCM-RB-TAD250 V
Typ. Load ResistanceSingle versionT-6L6GCM-RB-TAD4200 Ohms
Typ. Maximum Signal Plate CurrentSingle versionT-6L6GCM-RB-TAD66 mA
Typ. Output Power at 14% distortionSingle versionT-6L6GCM-RB-TAD8.5 W
Typ. Peak AF Grid 1 Control VoltageSingle versionT-6L6GCM-RB-TAD18 V
Typ. Plate VoltageSingle versionT-6L6GCM-RB-TAD350 V
Typ. Transconductance (nominal)Single versionT-6L6GCM-RB-TAD5,300 mS
Typ. Zero Signal Grid 2 Screen Current (avg)Single versionT-6L6GCM-RB-TAD2.0 mA
Typ. Zero Signal Plate CurrentSingle versionT-6L6GCM-RB-TAD54 mA
Packaging Information
Packaging DimensionsMatched Pair versionT-6L6GCM-RB-TAD-MP3.5 in. × 1.75 in. × 4.75 in.
Matched Quad versionT-6L6GCM-RB-TAD-MQ3.5 in. × 3.5 in. × 4.75 in.
Single versionT-6L6GCM-RB-TAD1.75 in. × 1.75 in. × 4.75 in.
Weight (Packaging)Matched Pair versionT-6L6GCM-RB-TAD-MP0.2375 lbs.
Matched Quad versionT-6L6GCM-RB-TAD-MQ0.595 lbs.
Single versionT-6L6GCM-RB-TAD0.1488 lbs.
Product Measurements by Item
T-6L6GCM-RB-TAD - Single versionApproximate net weight55 g (1.94 oz.)
BaseJEDEC #8ET, octal, 8-pin
Base Width35 mm
CathodeOxide-coated, unipotential
CoolingConvection
Envelope Height95 mm
Envelope Width38 mm
Heater Current0.9 A
Max. Bulb temperature (surface hottest point)250° C
Max. Cathode-to-heater potential200 V
Max. DC cathode current180 mA
Max. DC plate voltage550 V
Max. Grid no.1 (control) voltage-100 V
Max. Grid no.1 to cathode and grid no.3, grid no.2, base sleeve and heater<14 pF
Max. Grid no.1 to plate<2.1 pF
Max. Grid no.2 DC (screen) dissipation5 W
Max. Grid no.2 DC (screen) voltage500 V
Max. Heater Voltage (AC or DC)6.9 V
Max. Plate dissipation30 W
Max. Plate to cathode and grid no.3, grid no.2, base sleeve and heater<0.8 pF
Min. Heater Voltage (AC or DC)5.7 V
Nom. Heater Voltage (AC or DC)6.3 V
Operating Positionpreferably vertical
Total Height109 mm
Typ. Grid 1 Control Voltage-18 V
Typ. Grid 2 Screen Voltage250 V
Typ. Load Resistance4200 Ohms
Typ. Maximum Signal Plate Current66 mA
Typ. Output Power at 14% distortion8.5 W
Typ. Peak AF Grid 1 Control Voltage18 V
Typ. Plate Voltage350 V
Typ. Transconductance (nominal)5,300 mS
Typ. Zero Signal Grid 2 Screen Current (avg)2.0 mA
Typ. Zero Signal Plate Current54 mA
PDF: Datasheet for SingleT-6L6GCM-RB-TAD

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Specifications, Files, and Documents

PDF: Datasheet for Single (T-6L6GCM-RB-TAD)Datasheet for Single2.17 MB

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Product Reviews

4.20 out of 5 based on 5 reviews
wrongprong - March 9th, 2022
5 out of 5

Just installed 8 of these in my Mesa simul 395 along with 4 of the TAD 70025’s and am loving it. Nice balanced tone. Lots of attack even with a ton of gain.

wrongprong - March 9th, 2022
5 out of 5

Just installed 8 of these in my Mesa simul 395 along with 4 of the TAD 70025’s and am loving it. Nice balanced tone. Lots of attack even with a ton of gain.

TERRY L PERRY - February 2nd, 2022
1 out of 5

Sent 2 quads of these back to the Tube Depot, and the last quad back to AES.

I don't blame the resellers unless they are testing these again themselves once they receive them. I especially don't blame AES since they are depending on TAD to sell them supposedly well tested tubes. Whatever specific criteria TAD is using is not cutting it, in my very humble opinion.

I received so many exceptional tubes from TAD tubes in past years. Don't know where these Red Base 6L6's come from as the old Shuguang factory in China is no more.

Back to Russian tubes again, or at least Mesa branded tubes. The Mesa's are not the best sounding, but I've owned a boat load of them over the years without the problems I'm experiencing with these recent batches of TAD's.

For supposedly matched tubes, the quads I received differed as much as 40mA w/475VDC plates between tubes. I don't trust the ones I received to last with any dependability.

But what made them all unusable for me was too much noise. They crackled and hissed when put to task. Every single time on power up. Some would stabilize and settle down after 5 to 10 minutes, some would not.

I give up for a while after trying 3 different quads of them.

sparrow - January 5th, 2022
5 out of 5

Great clean and clear headroom.

elilabs - July 5th, 2021
5 out of 5

I loved the Winged-C 6L6's for the 1945 31H Leslie we have at our church. They ar no longert available. For several years I have been lookling for something that was that good. I think I have found it in the Tube Amp Doctor 6L6GCM-STR Redbase. I installed a matched quad of thses in the Leslie power amp, and they sound great! I will have to wait and see how they hold up, as I just put them in less than a week ago. I normally replace the power tubes in this Leslie once a year. I'm hoping they sound as good as they do now: powerful deep bass (32' pedal stops), and nice bright highs (1' drawbars), so they get worked all the way down to 16 Hz on the 32' low C on the pedals, and still have that screaming punch I like on the high notes.