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.

Product Measurements

Item Diameter: 33.3 mm
Item Height: 79 mm
Body Height: 93 mm
Filament Voltage (Uf): 6.3 V
Filament Current (If): 0.8 A
Plate Voltage (Ua): ≤ 550 V, 300 V typical
Plate Current (Ia): 60 mA
Grid Voltage 1 (Ug1): -10 V typical
Grid Voltage 2 (Ug2): ≤ 440 V, 300 V typical
Grid Current 2 (Ig2): 8 mA
Transconductance (S): 10 mA/V
Gain (μ): 16.8
Plate Dissipation (Wa): ≤ 19 W
Grid 2 dissipation (Wg2): 3.3 W
Cathode Current (Ik): ≤ 85 mA
Grid Circuit Resistance (Rg), Fixed Bias: 0.3 MΩ
Grid capacitance (cg1): 10 pF
Plate Capacitance (ca): 5 pF
Grid to Plate Capacitance (ca/g): 0.25 pF
Grid Circuit Resistance (Rg), Cathode Bias: 1 MΩ

Product Specs

Brand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
Brand JJ Electronic
Model T-7591-S-JJ-MP
Categories Tubes
Year 2020

Evan B. - April 06, 2020

Kris C. - April 06, 2020

Love them. Nice upgrade.

Gary W. - April 06, 2020

Pickguard is great. Only thing is I wish it had holes for the pickup. But that is on me for not seeing it. I will drill it to fit the pup. Fast shipping, packed better than anything I have seen. Good product, great value.

Amazing J. - April 06, 2020

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Shipping Policy

Ships from Tempe, AZ, United States to:

Continental U.S.

We offer standard shipping via USPS Mail or UPS. UPS shipments may ship via UPS Surepost. Most items $0-$88.99 are charged a nominal flat rate for shipping of $5.95 per item. Items that are over $89 ship at no cost per item. We do not offer any other shipping methods through our Reverb store at this time.

Tax Policies

Taxes are charged in the following regions either by the seller, per their tax policy, or by Reverb as a Marketplace Facilitator:

District of Columbia*
New Jersey*
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North Dakota*
Rhode Island*
South Carolina*
South Dakota*
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*Marketplace Facilitator State. Reverb collects tax on the sellers behalf. Learn More

Return Policy

Return Window

This product can be returned within 7 days of receipt.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.


Buyer receives a full refund in their original payment method less any shipping costs.

Special Conditions

Our Guarantee: All items have a 90 day warranty against manufacturing defects. In addition, all items are guaranteed to meet your satisfaction or they may be returned within 10 days for exchange or credit, providing the item is in sellable condition. Exclusions to the 10 day guarantee are items that have leads cut, evidence of soldering or other signs of installation and/or use. Please check and/or test your purchases upon receipt, even if the items are a back up set for future use, and notify us of any problems within the warranty period. Vacuum tubes are guaranteed to meet manufacturers specifications. Vacuum tubes cannot be returned if broken or due to damage resulting from operation outside the manufacturers' specified ratings. Should it be necessary to return merchandise for exchange or credit, please contact is to obtain a Return Merchandise Authorization (RMA#). No returns should be made without obtaining an authorization. If you received free shipping on the original order and the total of the order minus the amount from the returned goods no longer qualifies the order for free shipping, the original shipping charge will be deducted from the credit. All returns should be sent promptly; we must receive all returns within 30 days or the RMA number will become invalid. The RMA number must be placed on the outside of the package being returned in order to assure that your return is handled in a timely manner. We reserve the right to charge a restocking fee when no evidence of product failure exists if merchandise is returned after the 10-day period.

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Tempe, AZ, United States
Joined: Jul 2013

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Vacuum Tube - 7591, JJ Electronics, Apex Matched Pair
+ $5.95 Shipping