System changes (never-ending) have resulted in the inability to use several tubes that are all in fantastic condition with less than 50 hrs of use:

1. The latest Northern Electric 6SN7 vacuum tube has a wide and accurate sound-stage. This 6SN7 preamp tube has low noise floor which helps provide fantastic clarity and detail. Low end is tight and detailed. The midrange is sweet and magical. The highs are airy and warm. The Northern Electric 6SN7 vacuum tube is made with the highest quality materials. From the tapered glass bottle to the gold plated pins, everything is designed to give you unsurpassed audio quality. The Northern Electric 6SN7 preamp tube has black “T” shaped plates. Northern Electric has a rich history of producing high quality audio products and vacuum tubes in Canada.

New price was$60; I am asking $40 and will cover USPS shipping.

2. A Brand new Premium-matched pair of Tube Amp Doctor (TAD) 6L6WGC-STR tubes. The TAD 6L6WGC-STR is a remake of the small bottle GE 6L6GC and has the same warm lower midrange and silky top end as the classic GE versions of the 1950s and 60s. Like the historic RCA 5881, this tube features a small bottle enclosure, clear top and side getter. The TAD 6L6GCM-STR and the TAD 6L6WGC-STR have our exclusive beefed up cathode coating, gold grid wire, double getter construction, no-noise filaments and 1.2mm thick heavy duty glass. This tube is only 84mm high (without pins) and can replace 5881 or 6L6WGB tubes in most applications.
New price was $100; I am asking just $45 for the pair and will cover USPS shipping.

3. A mint condition NOS 1950s General Electric 5U4-G Rectifier with under 20 hrs of use. New price was $70; I am asking $50 and will cover USPS shipping.


Check my universally positive feedback on eBay (astro-chris), and on Audiogon (Cporada).

Thanks for looking!

I just found a brand new matched pair of Shuguang 6CA7-T Natural Sound tubes as well.

The Natural Sound 6CA7-T power tube has gold grid wires and pins, and internally coated black glass bottle. This unique HPCC coating is known as High Polymer Carbon Compound glass coating and is unique for its ability to reduce stray electron emission that can otherwise reflect off the glass.

Shuguang also uses their new "Super Alloy" technology. Originally applied to aviation, aerospace, and military applications, this technology has been successfully used by Shuguang to accomplish directional solidification and single crystallization. This greatly improves the ability of electron emission and electron current stability.

The Shuguang Natural Sound tubes require additional parts selection (Including thoriated tungsten filament imported from Japan), high-density carbon anode metal from Germany, high-purity high-density graphite, and gold plated pins). Manufacturing quality control processes, improved vacuum techniques and additional burn-in time and testing.

The 6CA7 tube is compatible with any EL34 tube amplifier.

New, these were $150 for the matched pair. I will sell them for $95 and will cover USPS shipping. They are still in their original boxes!

Hey AC, PM sent.

Randy