Vacuum Tube - KT77, JJ Electronics

JJ Electronics
Vacuum Tube - KT77, JJ Electronics image 1
Customer image:<br/>"My quad of JJ KT77s in my Marshall JVM 410H. Also running two Tung Sols and three JJ 12ax7s. "
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Vacuum Tube - KT77, JJ Electronics image 1
Customer Images:
Customer image: "My quad of JJ KT77s in my Marshall JVM 410H. Also running two Tung Sols and three JJ 12ax7s. "

Vacuum Tube - KT77, JJ Electronics

Starting at: $19.95
In stock

The JJ Electronic KT77 is a reproduction of the original tubes that captures the sound that made the KT77 famous. In their typical fashion, JJ has built this tube in a solid construction that is robust and highly reliable. This tube has more headroom than a typical EL34. The low end is fat and defines with detailed and responsive mids and smooth highs. This is an excellent tube for adding more power to the sound of an EL34 amp.

Apex Tube Matching
Matched versions of this tube use Apex Matching
RoHS Compliant
Item ID:
JJ Electronics, Apex Matched
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-KT77-JJ-MP609722123167
Apex Matched QuadT-KT77-JJ-MQ609722123174
Product Measurements
Body Height98 mm
Cathode Current (Ik)≤ 180 mA
Filament Current (If)1.4 A
Filament Voltage (Uf)6.3 V
Gain (μ)11.5
Grid 1 voltage (Ug1)-13.5 V typical
Grid 2 current (Ig2)≤ 10 mA
Grid 2 dissipation (Wg2)6 W
Grid 2 voltage (Ug2)≤ 600 V, 250 V typical
Grid capacitance (cg1)16.5 pF
Grid to Plate Capacitance (ca/g)1 pF
Internal Resistance (Ri)23 kΩ
Item Diameter33.3 mm
Item Height112 mm
Plate Capacitance (ca)9 pF
Plate Current (Ia)100 mA
Plate Dissipation (Wa)≤ 25 W
Plate Voltage (Ua)≤ 800 V, 250 V typical
Transconductance (S)10.5 mA/V
Packaging Information
Packaging DimensionsApex Matched Pair version4.8 in. × 3.3 in. × 1.6 in.
Apex Matched Quad version4.8 in. × 3.3 in. × 3.3 in.
Single version1.6 in. × 1.6 in. × 4.6 in.
Weight (Packaging)Apex Matched Pair version0.268 lbs.
Apex Matched Quad version0.536 lbs.
Single version0.134 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet470.74 KB

Questions and Answers

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Product Reviews

5.00 out of 5 based on 3 reviews
- August 7th, 2018
5 out of 5

A+ service and product again. Thanks guys! Lifetime customer. I cant fimd a better tube than the kt77s from amplified parts. Ive been through ever different tube under the sun, and always end up with jjkt77s in all my amps. Tone heaven after burned in and bias correctly.

- April 2nd, 2016
5 out of 5

Put a quad of these KT77s in my Marshall JVM 410H. Also got two Tung Sol and three JJ 12ax7s. Sounds very them and hope these last for awhile.

- November 27th, 2010
5 out of 5

High quality tubes, very quick shipping, well packed and great honest prices. Many thanks.

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