All tubes are completely tested for gas, shorts, leakage, and transconductance on our unforgiving, COMPUTERIZED and calibrated Hickok 118B cardmatic tester and our Amplitrex AT-1000. Balanced triode tubes are available in limited quantities as most lots will contain only 10% where both triodes are balanced. Balanced tubes for phase inverters and other applications are an extra $10.00 per tube. Power output tubes are also tested and matched on our Amplitrex AT-1000 as well as our Maxi-Matcher to provide tightly matched pairs within 1-3 milliamps of current draw. Pre-amp tubes are screened for noise and microphonics on our Vacuum Tube Valley Tube Characterizer. All pre-amp tubes are noise tested in an actual circuit at our facility for microphonics and noise and in our VTV Tube characterizer, and then dual section tubes are further graded for the closest section matching possible. We also use an independent laboratory for critical noise screening for Super Low Noise tubes for phono sections, microphones, and other critical applications. Please call us or email and let us know the grade you are looking for!
Tubes Unlimited Ships Worldwide except to Cuba, Iran, Iraq, Libya, North Korea, Sudan, Liberia, Rwanda, Somalia, Venezuela and UNITA (Angola)!
All tubes are professionally packed ultra-safe and usually ship the same day you place your order. International shipping is via EMS Global express mail for shipping worldwide. Overnite processing of your order is available at $50 extra.
You can pay for your items by Visa, Mastercard, Amex, as well as personal check, business check, cashiers check, US postal money order, or bank wire transfer. Just send us an email with the items you want to purchase. If you are planning on using bank wire transfer then please plan on adding $35 to the total for bank wire receiving fees. Email us your order and we will send you an invoice along with payment instructions.