Vacuum Tube - 7591, JJ Electronics

Vacuum Tube - 7591, JJ Electronics

JJ Electronics
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Starting at: $17.95
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The JJ Electronic 7591 is a reliable and accurate reproduction of the classic tube. This 19 Watt pentode has been used in a variety of amplifiers including Hi-Fi amps and Ampegs. The JJ 7591 is a great replacement for any 7591 tube position.

Apex Tube Matching
Matched versions of this tube use Apex Matching
RoHS Compliant
SKU:
T-7591-S-JJ
Item ID:
004803
Brand:
JJ Electronics, Apex Matched
Type:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-7591-S-JJ-MP609722122924
Apex Matched QuadT-7591-S-JJ-MQ609722122931
SingleT-7591-S-JJ609722122917
Product Measurements by Type
Body Height93 mm
Cathode Current (Ik)≤ 85 mA
Filament Current (If)0.8 A
Filament Voltage (Uf)6.3 V
Gain (μ)16.8
Grid 2 dissipation (Wg2)3.3 W
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.3 MΩ
Grid Current 2 (Ig2)8 mA
Grid Voltage 1 (Ug1)-10 V typical
Grid Voltage 2 (Ug2)≤ 440 V, 300 V typical
Grid capacitance (cg1)10 pF
Grid to Plate Capacitance (ca/g)0.25 pF
Item Diameter33.3 mm
Item Height79 mm
Plate Capacitance (ca)5 pF
Plate Current (Ia)60 mA
Plate Dissipation (Wa)≤ 19 W
Plate Voltage (Ua)≤ 550 V, 300 V typical
Transconductance (S)10 mA/V
Packaging Information
Packaging DimensionsApex Matched Pair versionT-7591-S-JJ-MP4.8 in. × 3.3 in. × 1.6 in.
Apex Matched Quad versionT-7591-S-JJ-MQ4.8 in. × 3.3 in. × 3.3 in.
Single versionT-7591-S-JJ1.6 in. × 1.6 in. × 4.6 in.
Weight (Packaging)Apex Matched Pair versionT-7591-S-JJ-MP0.228 lbs.
Apex Matched Quad versionT-7591-S-JJ-MQ0.456 lbs.
Single versionT-7591-S-JJ0.114 lbs.
Product Measurements by Item
T-7591-S-JJ-MP - Apex Matched Pair versionBody Height93 mm
Cathode Current (Ik)≤ 85 mA
Filament Current (If)0.8 A
Filament Voltage (Uf)6.3 V
Gain (μ)16.8
Grid 2 dissipation (Wg2)3.3 W
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.3 MΩ
Grid Current 2 (Ig2)8 mA
Grid Voltage 1 (Ug1)-10 V typical
Grid Voltage 2 (Ug2)≤ 440 V, 300 V typical
Grid capacitance (cg1)10 pF
Grid to Plate Capacitance (ca/g)0.25 pF
Item Diameter33.3 mm
Item Height79 mm
Plate Capacitance (ca)5 pF
Plate Current (Ia)60 mA
Plate Dissipation (Wa)≤ 19 W
Plate Voltage (Ua)≤ 550 V, 300 V typical
Transconductance (S)10 mA/V
T-7591-S-JJ-MQ - Apex Matched Quad versionBody Height93 mm
Cathode Current (Ik)≤ 85 mA
Filament Current (If)0.8 A
Filament Voltage (Uf)6.3 V
Gain (μ)16.8
Grid 2 dissipation (Wg2)3.3 W
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.3 MΩ
Grid Current 2 (Ig2)8 mA
Grid Voltage 1 (Ug1)-10 V typical
Grid Voltage 2 (Ug2)≤ 440 V, 300 V typical
Grid capacitance (cg1)10 pF
Grid to Plate Capacitance (ca/g)0.25 pF
Item Diameter33.3 mm
Item Height79 mm
Plate Capacitance (ca)5 pF
Plate Current (Ia)60 mA
Plate Dissipation (Wa)≤ 19 W
Plate Voltage (Ua)≤ 550 V, 300 V typical
Transconductance (S)10 mA/V
T-7591-S-JJ - Single versionBody Height93 mm
Cathode Current (Ik)≤ 85 mA
Filament Current (If)0.8 A
Filament Voltage (Uf)6.3 V
Gain (μ)16.8
Grid 2 dissipation (Wg2)3.3 W
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.3 MΩ
Grid Current 2 (Ig2)8 mA
Grid Voltage 1 (Ug1)-10 V typical
Grid Voltage 2 (Ug2)≤ 440 V, 300 V typical
Grid capacitance (cg1)10 pF
Grid to Plate Capacitance (ca/g)0.25 pF
Item Diameter33.3 mm
Item Height79 mm
Plate Capacitance (ca)5 pF
Plate Current (Ia)60 mA
Plate Dissipation (Wa)≤ 19 W
Plate Voltage (Ua)≤ 550 V, 300 V typical
Transconductance (S)10 mA/V

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet454.11 KB

Questions and Answers

Click each question to see its answers.
Asked by ergonomical69 on March 3rd, 2018.
Matt H.
March 7th, 2018
Staff Member
This tubes is 19 watts.
Anonymous
February 20th, 2019
The output power rating of a given amp hinges largely on the amp's power supply voltage. Designers are careful to choose voltages for the output circuit that won't push the tubes past their (max) power ratings. The 7591 is nominally listed at a max sustained capacity of 19WRMS, and your amp limits the output supply (plate) voltage so that the tube can safely operate below that maximum, at just 15 watts. In brief, your tube lasts a lot longer, and run a little cooler. And don't worry, this in no way reduces an amp's ability to sing its little heart out. As a general rule, this practice has been an industry-wide standard for a long time, for almost every popular amp, including those used by celebrated players.
Asked by Anonymous on June 26th, 2019.
Anonymous
July 15th, 2019
The JJ Specification drawing is wrong but the tube is made correctly and functions properly. I have compared the Westinghouse and Sylvania spec sheets for the 7591 tubes and they agree. Pinnouts as follows: 1 -no pin on tube, 2=Heater, 3=Plate, 4=Grid 2, 5=Cathode & Grid 3, 6=Grid 1, 7=Heater, 8= another Grid 2.

Product Reviews

4.60 out of 5 based on 5 reviews
- December 12th, 2019
3 out of 5

Meh. Westinghouse, Tung Sol, or other USA 7591As will last 5-20x longer than JJs, and the A suffix simply sound better and last longer. I just put Westinghouse 7591As in a pair of Mc30s (Mc Intosh) monoblocks, and they were worth the $250 over the JJs. I consider the JJs to be one of the better 7591s but lately I have had some real problems with JJ not properly annealing their glass. I have never had any RCA, Westinghouse, GE or Tung Sol's bottle crack from the heat. Tung Sol as in Tung Sol made in USA not Mike Mathews' New Sensor reissue stuff from Russia. So far I haven't had too many problems with New Sensor tubes cracking from heat & cooling. That is mostly a JJ problem, and it's getting really old too.

- February 28th, 2016
5 out of 5

I have used the JJ 7591 tubes in numerous customer amps over the past few years with good results. They sound good, and have bias levels similar to the originals, the supply of which continue to diminish.

- September 22nd, 2015
5 out of 5

I love having AES within a 30 minute drive. I can actually order something simple, like tubes, in the morning and pick it up that same day during their 90 minute window of opportunity. Their prices are great, they have what I need for most of my vintage tube stereo needs. Life is good

- July 16th, 2015
5 out of 5

Scott 7591a works very well in my Scott 299c and LK-72 .

- May 10th, 2015
5 out of 5

Tubes worked great in my 50 year old Ampeg amplifier. The people at Antique Electronic Supply, especially the person I spoke with (I think his name was Justin), were more than helpful in understanding what I needed, and getting me the difficult to find replacement tubes. Great product and great service.

Substitute Products

The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.