JAN-Sylvania 5751 Preamp Vacuum Tube

1 Review
Out of Stock
SKU: SY-5751
USD $‎79.95
This JAN-Sylvania 5751 preamp tube has grey plates and double mica. These tubes were made in the late 1970's to 1980's for the US military and are packaged in original boxes.

Special Note: The 5751 is not a true 12AX7, but is often used in place of a 12AX7. They generally have 70% of the gain of a 12AX7. If you have gain to spare using a 5751 vacuum tube will greatly improve your overall tone without making your preamp excessively clean. You can learn more about this on our tone tweak info page.

Other JAN Military tubes    12AX7 Types

Additional Information and Downloads

12AX7 Tube Review

Tube Matching Information:
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Warranty Information and Return Policy

Warranty Period: 3 months

All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)

If you receive a tube that does not perform to the manufacturer's specifications, please do the following:

- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.

Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.

We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

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Great example of a real 5751WA military valve.


This is the longer plate version of the W JAN type 5751s. These are the real deal, ruggedized suited for vibration, high G shock loads, and varying filament voltages found in mobile equipment. These will dial back the gain in unruly amps, and are not merely weak versions of a 12AX7, like current production tubes. They cost more, but they usually last long enough to pay for themselves. Until you try a NOS 5751, don't judge. These are a nice standard to judge from, and make a nice baseline for comparison, as well as a great tube for any amp.