Most of these tubes were tested on my Peavey
VB-2 and Valveking heads and have all tested to be noise/hum/microphonic free as can be seen in one of my testing scenarios:
The only tubes I couldn't test were the pentodes and power tube. In the event these untested tubes turn out to be problematic, I'll be happy to refund your purchase upon return of the tubes. This goes for any of the tested tubes as well. I couldn't get my hands on a tube tester so these tubes are offered individually and not in any matched pair/quad combos. I have the following for sale:
Sylvania 12AX7A/ECC83 7025 (8 available) - $17 shipped/each
Telefunken 12AX7/ECC83 smooth plate (7 left) packaged in plain white box labeled, "Selected 12AX7" and have the raised diamond on the bottom of the tube. The real deal-$79 shipped/each
Sylvania 12AT7/ECC81 (8 available) - $15 shipped/each
Svetlana 6550B-2 (1 available) $22 shipped
Paypal preferred. Well packed and shipped via USPS Parcel Post. If you have any questions, concerns, etc, don't hesitate to PM me.
Thanks, Jim.
