Tung-Sol Factory Platinum Matched PAIR two 7591A 7591

Description

New Platinum matched PAIR (set of two) Tung-Sol 7591A tube.  These are found in Ampeg, McIntosh and Fisher amplifiers.  Why settle for NOS tubes of unknown quality when you can have these tubes that are burned in for 24 hours and then bias matched for plate current.
The factory matches at real world voltages and then the test results are labelled on each tube box.
They are all recent date codes.
The factory matches these tubes at 400V Plate, 250V Screen and -20.52 V bias.
Insist on factory platinum matched tubes for best performance.
Application note
:
There have been cases where new production 7591A tubes have had trouble in circuits using a very high value grid resistor, such as Scott and Fisher (others too). If you find this to be the case, the best solution is changing all the grid resistors to 200K-220K from the original value, since often the factory spec resistors exceeded the maximum recommendations.  Fisher often used 330K carbon resistors that would often drift up to 360K over time.
All tubes carry the 90 day factory warranty against defects from date of purchase.
I have been selling tubes of all types for more than ten years.  Buy with confidence.
On Nov-06-19 at 06:21:36 PST, seller added the following information:
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