Both tubes appear to have the same date code of SJ (although faint on one) which should put them as being from 1975. The print on these tubes is fragile and will easily rub off, much of the white print has already rubbed off, but the etched identifying number is still clearly visible. Although used, these tubes should still have some decent life left in them and are priced accordingly. The tubes’ test results are displayed in the photos (New 6550 Spec 100% =11,000 Gm). See the photos for physical / cosmetic condition. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

Vintage HEATHKIT A-9C Mono Tube Amplifier Untested No Bottom Plate Tubes & Cord. The power cord has been cut and some parts have been removed (not by me). There is NO bottom plate underneath the device so the wiring is exposed. If you have any questions or concerns feel free to reach out.

This particular tube tests very strong, although it’s not the most balanced tube. Often square-getter Mullards are associated with mC1 production codes, and the halo-getter tubes with f91 and later codes. Oddly though, this particular tube has an f91 code AND a square-getter. The f91 code on this tube is Extremely faint, and is almost impossible to see with a naked eye even under good light (and even more difficult to photograph, but I think I managed to barely capture it with a back-light enough to sort-of see it’s faint outline). The print on the tube is very fragile and will easily rub off, some has already rubbed off, special care was taken not to rub off any more while testing. The tube’s test results are displayed in the photos (New 12AX7 Spec 100% = 1,600 Gm). See the photos for physical / cosmetic condition. Part of the design is a little springy shock absorber the keeps the tube safely centered in the box and from rattling around. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

Offered for sale are the 3 tubes as titled and pictured. These particular 3 tubes tests strong and are closely balanced / matched. The tubes’ test results are displayed in the photos (New 5751 Spec 100% = 1,200 Gm). Note: Even though this tube is often considered interchangeable with the 12AX7, the 5751 does have a bit less gain than a 12AX7, so the test results displayed are the actual Amplitrex specs for the 5751. Also, these tubes are labeled Westinghouse and there are no other EIA codes or numbers on them. So far, these boxes are still just a concept and in the prototype stage (3D Printed). Any and constructive feedback on the idea is welcomed and appreciated. Eventually I plan to offer these boxes for sale by. Themselves, but not quite yet. See the photos for physical / cosmetic condition. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

Up for sale here is this huge. Power transformer, dated 1957 and Made in USA. This was removed from a vintage Raytheon Microtherm heat radiation machine. I tested this, and with a 120v input (terminals 1/2) I tested the secondaries at 1460v (#4/5), 2910v (#4/6), 1460v (#5/6), and 360v (#3/4). Transformers usually test a little high when they’re not loaded, but these are still crazy high voltages. This is a massive transformer, so it should be good for plenty of current. This is used with light to moderate overall wear, and looks really good. It is guaranteed to work for you. This has some great specs and would be awesome for building something crazy. Please see my pictures for details and dimensions. If you have any questions, please ask. I have more transformers and other vintage electronics listed–feel free to take a look!

Offered for sale are the 3 tubes as titled and pictured. These particular 3 tubes tests strong and are closely balanced / matched. The tubes’ test results are displayed in the photos (New 5751 Spec 100% = 1,200 Gm). Note: Even though this tube is often considered interchangeable with the 12AX7, the 5751 does have a bit less gain than a 12AX7, so the test results displayed are the actual Amplitrex specs for the 5751. Also, these tubes are labeled Westinghouse, and there are no other EIA codes or numbers on them, but based on their construction style. And by comparison of hundreds (if not thousands) of other tubes over the years, they appear to be of Raytheon make / origin. So far, these boxes are still just a concept and in the prototype stage (3D Printed). Any and constructive feedback on the idea is welcomed and appreciated. Eventually I plan to offer these boxes for sale by. Themselves, but not quite yet. See the photos for physical / cosmetic condition. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

BRAND NEW TJ FULLMUSIC VACUUM TUBE Item No. 300B/n, Mesh plate The price is for 1 Matched pair (2PCS, factory matched&test) Mesh plate, ceramic base, gold plated brass pins Nominal operating conditions and parameters Filament voltage………………….. 2.5V Nominal filament current……………….. 1.5A Plate voltage……………………. 250V Grid voltage…………………….50V Plate current……………………. 34mA Amplification factor………………….. 3.5 Load resistance…………………… 3900 ohms Grid Current……………………..0.05? A Limiting Operation Conditions for Safe Nor simultaneous ratings Maximum plate voltage……………….. 275 volts Maximum plate current……………….. 10 watts. New Matched Pair TJ Fullmusic Vacuum Tube 300B/n Mesh Plate Vintage HIFI AMP DIY. BRAND NEW TJ FULLMUSIC VACUUM TUBE. The price is for 1 Matched pair (2PCS, factory matched&test). Mesh plate, ceramic base, gold plated brass pins. Nominal operating conditions and parameters. Filament voltage………………….. 2.5V. Nominal filament current……………….. 1.5A. Plate voltage……………………. 250V. Grid voltage…………………….50V. Plate current……………………. 34mA. Amplification factor………………….. 3.5. Load resistance…………………… 3900 ohms. Grid Current……………………..0.05? A. Limiting Operation Conditions for Safe Nor simultaneous ratings. Maximum plate voltage……………….. 275 volts. Maximum plate current……………….. 10 watts. Thank you very much! We will put legal effort to minimize any GST or V. T or GST yourself. Provide your full name & correct address in details. Less than 0.5%. We sell vacuum tubes, Amplifiers, various tube sockets, audio connectors, triode transformer cover, leather amplifier handles, capacitors, various knobs, aluminum amplifier chassis, etc. Various Parts for tube audio guitar amplifier projects! We will reply all of your messages ASAP!

See photos for condition.

See photos for condition.

See photos for condition.