4x ICE Mullard ECC88/6DJ8 tubes tested on an amplitrex AT-1000 in fixed bias mode. Three Bugle Boys made in Holland, one made in Great Britain. Shipping included in price, USPS Priority Mail.
4 - 16.4mA - 12.013mA/V - .4mA5 - 15mA - 11.7mA/V - .4mA
7 - 18mA - 15.13mA/V - .0mA
9 - 17.8mA - 12.8mA/V - .4mA