Philips ECG 6189 6189W JAN6189W 12AU7 ECC82 Vacuum Tube Milspec / Industrial NOS NIB For Your Univalve Or Bottlehead Black Plate NOS NIB The disks are well-made and

The disks are well-made and quiet with just a few pops and ticks here and there

They measured 45

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new in box GE 6BW11 tubes tested to spec on our Paul Hart-calibrated TV7/U

Minimum (65%) is 32/32 and 100% 66/66

Philips ECG 6189 6189W JAN6189W 12AU7 ECC82 Vacuum Tube Milspec / Industrial NOS NIB For Your Univalve Or Bottlehead Black Plate NOS NIB The disks are well-made andThis new old stock, new in box milspec industrial Philips ECG 6189 JAN 6189W dual triodes with was tested on our Maxi Preamp II for shorts, gas, noise, transconductance and gain and on our TV7 U for a more commonly used reference. TV7 U readings are in (parenthesis). There were no shorts, noise or gas and it tested as follows: Noise: 86. 5 dB 86. 4 dB ( 92 dB is the Maxi Matcher's noise floor) Transconductance: 1541 1532 (Transconductance: where the