Description
Description Here for sale is a matched date code pair of Telefunken ECC88 tubes. Date codes are both U2107904a which indicate manufacture in Ulm 9/12 of either 1956, 1966, or 1976. These tubes both test strong on an Amplitrex AT1000. They both have great Gm balance and test quiet for microphonics / noise. Perfect tubes for 6922 based tube preamps. Detailed results are shown below. Boxes have some old pencil markings on the inside and show shelf wear. Test Data: Test Parameters - 6922 Setting, Fixed Bias, Automatic Result Format - Plate Current % of NOS Target / Gm % of NOS Target, Microphonic performance rated on a subjective 1-5 scale, (1) being unacceptable, (5) being near perfect. Tube 1 Triode 1 - 113/101 - Microphonic Test 4/5 Tube 1 Triode 2 - 133/105 Microphonic Test 4/5 Tube 2 Triode 1 - 129/107 Microphonic Test 4/5 Tube 2 Triode 1 - 120/108 Microphonic Test 4/5 Payment Accepted, along with all eBay approved payment methods. - Payment required within (3) days of purchase or auction close. Returns No return offered for this listing. Shipping Item usually ships within (3) business days of cleared payment. Note: This item may be eligible for international shipping either directly or through the eBay Global Shipping Program. If you are a buyer from outside of the US please contact me for additional details. Sales Tax eBay now automatically collects sales tax for all shipped transactions. If you are picking up your purchase from us in NYC, 8.875% local sales tax will be charged