One matched pair of 6688/E180F tubes, Gold Pin, by Philips of Holland.

Heavy Duty, with triple-mica construction, at NOS ratings.

Test Ratings:  105 to 110 on my Jackson 648s tester, minimum is 70, new tubes at about 105.

SHIPPING: Shipping to USA and Canada with tracking. But shipping to International countries will be with no tracking, to save you about $35 and more, depending on the particular country.

Combined shipping saves money.

Please pay in 3 days. Combined shipping is welcome. If you have paid for individual items and have surplus shipping fee paid for, I will refund you immediately when I send out the combined parcel.