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Vacuum Tube - KT77, JJ Electronics

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SKU:	T-KT77-JJ
Item ID:	004874

Starting at: $19^.95

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Vacuum Tubes Apex Matched

Type

Power

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.

Matched versions of this tube use Apex Matching

Part Numbers
Single or Matched	Our Part Number	UPC/EAN
Apex Matched Pair	T-KT77-JJ-MP	609722123167
Apex Matched Quad	T-KT77-JJ-MQ	609722123174
Single	T-KT77-JJ	609722123150

RoHS Compliant

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Specifications, Files, and Documents

Specification Sheet

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Product Measurements by Type (click to expand)

Product Measurements by Type
Body Height		98 mm
Cathode Current (I_k)		≤ 180 mA
Filament Current (I_f)		1.4 A
Filament Voltage (U_f)		6.3 V
Gain (μ)		11.5
Grid 1 voltage (U_g1)		-13.5 V typical
Grid 2 current (I_g2)		≤ 10 mA
Grid 2 dissipation (W_g2)		6 W
Grid 2 voltage (U_g2)		≤ 600 V, 250 V typical
Grid capacitance (c_g1)		16.5 pF
Grid to Plate Capacitance (c_a/g)		1 pF
Internal Resistance (R_i)		23 kΩ
Item Diameter		33.3 mm
Item Height		112 mm
Plate Capacitance (c_a)		9 pF
Plate Current (I_a)		100 mA
Plate Dissipation (W_a)		≤ 25 W
Plate Voltage (U_a)		≤ 800 V, 250 V typical
Transconductance (S)		10.5 mA/V

Packaging Information
Packaging Dimensions	Apex Matched Pair version	4.8 in. × 3.3 in. × 1.6 in.
	Apex Matched Quad version	4.8 in. × 3.3 in. × 3.3 in.
	Single version	1.6 in. × 1.6 in. × 4.6 in.
Weight (Packaging)	Apex Matched Pair version	0.268 lbs.
	Apex Matched Quad version	0.536 lbs.
	Single version	0.134 lbs.

Product Measurements by Item (click to expand)

Product Measurements by Item
T-KT77-JJ-MP - Apex Matched Pair version	Body Height	98 mm
	Cathode Current (I_k)	≤ 180 mA
	Filament Current (I_f)	1.4 A
	Filament Voltage (U_f)	6.3 V
	Gain (μ)	11.5
	Grid 1 voltage (U_g1)	-13.5 V typical
	Grid 2 current (I_g2)	≤ 10 mA
	Grid 2 dissipation (W_g2)	6 W
	Grid 2 voltage (U_g2)	≤ 600 V, 250 V typical
	Grid capacitance (c_g1)	16.5 pF
	Grid to Plate Capacitance (c_a/g)	1 pF
	Internal Resistance (R_i)	23 kΩ
	Item Diameter	33.3 mm
	Item Height	112 mm
	Plate Capacitance (c_a)	9 pF
	Plate Current (I_a)	100 mA
	Plate Dissipation (W_a)	≤ 25 W
	Plate Voltage (U_a)	≤ 800 V, 250 V typical
	Transconductance (S)	10.5 mA/V
T-KT77-JJ-MQ - Apex Matched Quad version	Body Height	98 mm
	Cathode Current (I_k)	≤ 180 mA
	Filament Current (I_f)	1.4 A
	Filament Voltage (U_f)	6.3 V
	Gain (μ)	11.5
	Grid 1 voltage (U_g1)	-13.5 V typical
	Grid 2 current (I_g2)	≤ 10 mA
	Grid 2 dissipation (W_g2)	6 W
	Grid 2 voltage (U_g2)	≤ 600 V, 250 V typical
	Grid capacitance (c_g1)	16.5 pF
	Grid to Plate Capacitance (c_a/g)	1 pF
	Internal Resistance (R_i)	23 kΩ
	Item Diameter	33.3 mm
	Item Height	112 mm
	Plate Capacitance (c_a)	9 pF
	Plate Current (I_a)	100 mA
	Plate Dissipation (W_a)	≤ 25 W
	Plate Voltage (U_a)	≤ 800 V, 250 V typical
	Transconductance (S)	10.5 mA/V
T-KT77-JJ - Single version	Body Height	98 mm
	Cathode Current (I_k)	≤ 180 mA
	Filament Current (I_f)	1.4 A
	Filament Voltage (U_f)	6.3 V
	Gain (μ)	11.5
	Grid 1 voltage (U_g1)	-13.5 V typical
	Grid 2 current (I_g2)	≤ 10 mA
	Grid 2 dissipation (W_g2)	6 W
	Grid 2 voltage (U_g2)	≤ 600 V, 250 V typical
	Grid capacitance (c_g1)	16.5 pF
	Grid to Plate Capacitance (c_a/g)	1 pF
	Internal Resistance (R_i)	23 kΩ
	Item Diameter	33.3 mm
	Item Height	112 mm
	Plate Capacitance (c_a)	9 pF
	Plate Current (I_a)	100 mA
	Plate Dissipation (W_a)	≤ 25 W
	Plate Voltage (U_a)	≤ 800 V, 250 V typical
	Transconductance (S)	10.5 mA/V

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Product Reviews

5.00 out of 5 based on 3 reviews

5 out of 5

Excellent sounding tubes. Great bottom end response.

Rick Snyder - June 8th, 2020

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5 out of 5

I was a little skeptical about the difference from switching from el34s to kt77 and the tones I would get. After installation I was blown away! It was way beyond my expectations. Very saturated tone with a better low end. I couldn't be happier!

Rodolfo James - January 8th, 2016

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5 out of 5

I put these in an Egnater renegade amp instead of the EL34"s and re-biased. Very clean with some upper end "jingle" that I did not have with the other tubes. Slightly more gain than the 6L6's and a little brighter. The tube matching with the new Apex system was dead on. Thanks again!!wb

Wishbone - October 14th, 2015