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The JJ KT77 is an alternative to the common EL34 tube.
From our review: "Overall a nice balance of tone in bass, midrange and treble. The breakup is earlier than a 6L6 with more compression but not as compressed as the EL34. If you have a Marshall amp and find EL34’s too compressed and 6550’s too crunchy the JJ KT77 may be just the ticket."
The now rare KT77 tube was introduced by MO-Valve in the late 1950's and has recently been brought back by JJ. They use the same base and biasing as any EL34 tube so they are a great option for substitution in any EL34 amp.
View JJ KT77 tube data sheet.
Other JJ Electronics tubes EL34 Tube Types
Additional Information and Downloads
EL34 Tube Review
Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System
JJ KT77 Datasheet (PDF)
Download Adobe Acrobat PDF reader
Warranty Information and Return Policy Warranty Period: 3 months
All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)
If you receive a tube that does not perform to the manufacturer's specifications, please do the following:
- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.
Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.
We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.
These guidelines may be updated without notice.
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By John Straub
from Middletown NJ
Very Good Sounding JJ KT77
By Bill R
from Stouffville, Ontario, Canada
By Bob J.
from Seattle, WA
By Rob O'Donnell
from Auckland, NZ
Great tube for modern hard rock and metal.
By TubeHead Johnny
from The Emerald City, Seattle, Washington
Very Good Sounding EL34 Variant