KT77, JJ Electronics Vacuum Tube, Apex Matched Pair, Power

Slide
$60.3
Brand
Apex Matched
MPN
T-KT77-JJ-MP
Compatible Brand
Any
Compatible Model
Any
Features
None
Amplifier Type
Unknown
Item Diameter
33.3 mm
Item Height
112 mm
Body Height
98 mm
Filament Voltage (U<sub>f</sub>)
6.3 V
Filament Current (I<sub>f</sub>)
1.4 A
Plate Voltage (U<sub>a</sub>)
≤ 800 V, 250 V typical
Plate Current (I<sub>a</sub>)
100 mA
Grid 1 voltage (U<sub>g1</sub>)
-13.5 V typical
Grid 2 voltage (U<sub>g2</sub>)
≤ 600 V, 250 V typical
Grid 2 current (I<sub>g2</sub>)
≤ 10 mA
Transconductance (S)
10.5 mA/V
Internal Resistance (R<sub>i</sub>)
23 kΩ
Gain (μ)
11.5
Plate Dissipation (W<sub>a</sub>)
≤ 25 W
Grid 2 dissipation (W<sub>g2</sub>)
6 W
Cathode Current (I<sub>k</sub>)
≤ 180 mA
Grid capacitance (c<sub>g1</sub>)
16.5 pF
Plate Capacitance (c<sub>a</sub>)
9 pF
Grid to Plate Capacitance (c<sub>a/g</sub>)
1 pF
Type
Vacuum Tube
UPC
609722123167
condition
New
Product Details
KT77, JJ Electronics Vacuum Tube, Apex Matched Pair, Power, Package of 2.0000
  • T-KT77-JJ-MP
  • Package of 2.0000

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

These tubes are matched using Apex Matching.

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Measurements
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 Dimensions4.8 in. x 3.3 in. x 1.6 in.
Weight (Packaging)0.269 lbs.
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