Vacuum Tube - 6L6GC, Tube Amp Doctor

Tube Amp Doctor (TAD)
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Vacuum Tube - 6L6GC, Tube Amp Doctor

Starting at: $25.65
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Octal power tube (Max Plate Watts = 30W) TAD 6L6GC-STR RCA-Style black-plate

TAD has the remakes of the all time favorite 6L6 classics by RCA and GE. The TAD 6L6GC-STR is your perfect choice if you are up for the sound of the rock legends. It provides the low end with the right amount of pressure, as known from the famous RCA tubes. It has clear, transparent but unobstrusive highs and exactly the right bite to provide you with all those classic 6L6 sounds from big warm cleans to modern hard rock sounds.

This TAD 6L6GC-STR combines the famous reliability of the american made Philips/Sylvania STR series (also known as MESA 6L6GC-STR415) with the black-plate system of the highly regarded vintage RCA 6L6GC tubes. Silky top end, combined with deep bass response and lots of headroom make this tube a living classic.

Exclusive black-plate designs, gold gird wire, double getter construction, no-noise filaments and the 1.2mm thick heavy duty glass envelope.

RoHS Compliant
Item ID:
Tube Amp Doctor (TAD)
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-6L6GC-TAD-MP609722123334
Matched QuadT-6L6GC-TAD-MQ609722123341
Product Measurements
Matched PairT-6L6GC-TAD-MPPackaging Dimensions2 in. x 4 in. x 4.8 in.
Matched PairT-6L6GC-TAD-MPWeight0.4 lbs.
Matched QuadT-6L6GC-TAD-MQPackaging Dimensions2 in. x 8 in. x 4.6 in.
Matched QuadT-6L6GC-TAD-MQWeight0.8 lbs.
SingleT-6L6GC-TADPackaging Dimensions2 in. x 2 in. x 4.6 in.
SingleT-6L6GC-TADWeight0.2 lbs.

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Questions and Answers

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Asked by Anonymous on April 14th, 2016. 1 person subscribed to this question
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April 15th, 2016
Staff Member
Top Contributor
To be honest TAD's matching numbers wouldn't correspond to the Groove Tubes style 1-10 system. I would suggest requesting higher numbers on the TAD tubes to get in the general ballpark.
Asked by Anonymous on October 16th, 2018. 1 person subscribed to this question
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October 16th, 2018
Staff Member
The short answer to your question is yes, you can use the the Tube Amp Doctor 6L6GC in place of the GTs. To get a detailed description of all of the 6L6 (and variants) tubes we offer, please check out or 6L6 Comparison of Current Made Tubes chart:
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Product Reviews

5.00 out of 5 based on 3 reviews
DDawgAZ - January 2nd, 2019

Definitely a step up in tone and clarity from the 5881 Tung-Sol re-issue pair that were in my Carr Rambler previously.

Brian Ness - October 27th, 2018

Tubes do everything in my Carr Rambler that they claim to do which I guess isn't a surprise as Steve Carr puts them in his new production amps nowadays.

Nice even low end and bright but not fizzy top. Selecting the correct phase inverter/driver tube is critical. I got the best results with a NOS Jan/Philips 12AXTWA.

anthonymturco - December 11th, 2011

I have a fender blues deluxe reissue that I have swapped many tubes out of, 6l6's and 6v6's. I must say that these tubes are the best sounding tubes I have heard yet. I have tried JJ 6l6 and 6v6 and Groove Tube 6l6 and these just blow them all away. Very big sounding, warm and the bass is round and fat. Doesn't get to boomy. I say give these a try and you will like what your ears are hearing.

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