TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Tubes test at 11650 and 9690 where 6630 micromhos is pass/fail grade. 133% / 101.6% mA plate current. 114.2% / 95% gm mutual conductance.
Item Category: Vintage Electronics
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7591A GE brand International Coin Base Halo Getter Tested Pair Tubes Made in USA
Tested with AMPLITREX AT-1000 Tube tester MADE IN USA. Other test made Reboxed in our custom white box. Closing adhesive tape in brown paper – ECO-KRAFT. Brown paper sealing tape – ECO-KRAFT. TEST RESULT: VERY STRONG.
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TWO McIntosh 7591A Tubes / Amplitrex Tested /Strong Plate Current/Close Gm Match
TWO McIntosh 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). 85.6% / 86.8% gm mutual conductance. Tubes test at 8740 and 8860 where 6630 micromhos is pass/fail grade. Tube 1: 8740 micromhos @ 60.6mA plate current emissions.
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2x MatchedNOS 7868 GE USA PowerTubes/Fisher Bogen Ampeg /Like 7591A w/Adapter
+ ampeg conn scott sherwood pilot sansui kenwood pioneer eico harmon gibson and even seeburg jukeboxes incorporated these. these oe boxed ge usa classics are collectible for their sound, long tenured history, and top build quality (see their 5star series!).
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Amplifier 7591 7591A Vacuum Tube Tester V8 Bias Current Checker Octal mA Version
Octal 8pin probes cable lengh: 55cm. 4pcs Octal 8pin Bias Current Probes. A separate resin board is used at the top. Prevent short circuits making readings incorrect. 03: Then plug V8 tester probes in amplifier socket.
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Sylvania 7591 7591A Excellent Testing Values Matched Quad
The tube was carefully tested on my TV-7D/U at 68-70-70-72/36 min good (55-56=100%). They all sound wonderful on my hifi system. Super rare and hard to find now.
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GE General Electric 7591A Vacuum Tube : Coin Base
GE General Electric 7591A Vacuum Tube. Up for sale is a GE General Electric 7591A Vacuum Tube. Model : 7591A ( Coin Base/O-Getter ). I tested tubes on my TV7B/U tube tester. Test Results : Tube 1 – 47.
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CMI 7591A Vacuum Tube Tests Good
CMI 7591A Vacuum Tube. Tests good on my Jackson 648S at 97 with line 70 and tops 130. No shorts or leaks detected. USA sales only. No international sales.
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1 GE 7591 7591A Vacuum Tube Tested NOS Calibrated TV – 7
This tester also is used in conjunction with a variac to maintain test results accuracy and consistency. This tube tested at- 68. Average new tube value – 56. I will always list original photos of actual item you are receiving.
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Vintage RCA 7591A Vacuum Tube | NOS | Black Plate | Made in USA | Rare Hi-Fi…
This is a premium vintage RCA 7591A power pentode, highly sought after for the legendary Fisher 500C, 800C, and McIntosh amplifiers. Condition: Beautiful New Old Stock (NOS) appearance. Crystal clear glass with a strong mirror-like getter. Design: Features the superior Black Plate construction. Testing: Visual inspection only; sold untested/as-is. This is a high-value piece of audio history. It will be professionally packed, double-boxed, and insured for shipping.