Variants Description Stock Price Quantity
RT821 single (1 selected tube) on_Stock € 31,50
RT822 Pair (2 matched tubes) on_Stock € 63,00
RT824 Quartet (4 matched tubes) on_Stock € 126,00

(incl. Tax excl. shipping)


The Legendary Old-School Tone!!

The TAD KT66 is our remake of the great British KT66 by MOV (MO Valve), GEC, Genalex and Gold Lion. This tube is THE REAL THING. It has a large curved glass envelope and a rounded brown base. It made the Marshall JTM45 Plexi amps famous in the 60's and the Quad Hi-Fi amps a legend.

Speaking of legends: SRV used the KT66 in his Fender Amps for his outrageous, gigantic guitar sound.

Tube height (without pins): approx. 115mm.

For a full bodied thick tone with larger headroom, smooth but detailed top end, single channel amps, dynamic playing, vintage British Rock and Roll as well as for the new modern vintage amps 2266 and 2466.
It can also replace the 6L6GC and 5881 tubes.
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

Premium RT-Matching of Power Tubes
Our Premium Matching is an exact matching of power tubes with identical Plate Current (PC) and Transconductance (TC).

TAD Premium Selected tubes are guaranteed for a period of 6 months (according to terms of warranties) for the quality criteria mentioned above.

RohS Compliant
Show 1 to 5 (in total 5products)

Robert Burns (5/5)

Sound wonderful in my Quad 11 mono blocks. Large sound...detailed high end. Making my ESL 57's sounding VERY special.
Great service from Tube Amp Doctor.

Peter Haig (5/5)

The pair of TAD KT66 valves that I have are one of the best matched pair of power valves in my collection. In my Marshall JTM45 there is less than one milliamp between them. The sound is brassy and imposing with a good tight bass and yet sweet, detailed and easy to listen to. I have both the old stock GEC and the new Gold Lion KT66. The TAD KT66 that I have are more than a match for those and any other KT66 on the market.

João Carlos Esteves (5/5)

They sound great in my Quad II amps.

Luis Santos (5/5)

KT66 sound - that`s it for the money, look no further
Amazing sound on my JTM45

roe fremstedal (5/5)

one of the very best current production kt66s. after testing two pairs of these in two jtm45 and a komet 60 (as well as various plexis), I ended up preferring these tubes over the gold lions by a small margin. I also comparred the sound to two pairs of shuguangs that appear to be made at the same factory but ended up clearly preferring the TADs, since they sound more like the original GECs. by comparison, the tung-sol sounds like a 6l6gc
Show 1 to 5 (in total 5products)

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