This very good testing matched pair Ken-Rad Type 78 US Navy CKR-78 tubes bottom foil D dimple getters was tested in our Jackson 648 and they measured:

Tube One:  75 (US NAVY CKR-78 stenciled on base with code Z2; 78 stenciled on side and atop of glass)
Tube Two:  81 (US NAVY CKR-78 stenciled on base with code Z2; 78 stenciled on side and atop of glass)

Good range is from 70 - 130 on the Jackson.  These test 75% & 81%.  Pair have matching codes of Z2.

Tubes ships via United States Postal Service (USPS) Ground Advantage with tracking for domestic U.S. sale; Priority Mail is an option if you wish your 
package delivered quicker.  International orders ship via International Shipping service.

Package weighs ten ounces (10 oz).

Check out other tubes in my store for your equipment needs.

Combined shipping always welcomed.

TUBES ARE GUARANTEED GOOD AND IN WORKING ORDER AT SHIPMENT. TRANSIT VIA POST CAN DAMAGE TUBES.  THIS IS NO FAULT OF OURS BUT THE THIRD 

PARTY ENTITY THAT IS DELIVERING ITEM(S) TO YOU, I.E, USPS, UPS, FEDEX, YOUR NATIONAL CARRIER IF INTERNATIONAL, ETC. PLEASE INSURE THEM! WE 

CANNOT GUARANTEE FAILURES ON YOUR EQUIPMENT AFTER POWER UP AS THERE IS NO WAY TO ASCERTAIN HOW TUBES WILL INTERACT WITH YOUR 

ELECTRONICS; NOR IS THERE A WAY TO DETERMINE WHETHER THEY MAY HAVE FATAL FLAWS IN TUBES THEMSELVES!  THESE ARE USED VACUUM TUBES AND 

TIME MAY HAVE TAKEN A TOLL ON THEM OVER THE MANY YEARS SINCE THEY WERE MANUFACTURED. WE CAN ONLY TEST FOR THE PARAMETERS MENTIONED 

ABOVE IN ONE OR MORE OF THE FOLLOWING EQUIPMENT WE USE FOR MEASURING:  HICKOK 600A, HICKOK 800, MAXI MATCHER & MAXI MATCHER 2.