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* 
One matched pair, circa 1930's, U.S.A made by Cunningham,
'Balloon' type C-327 vacuum tubes 
as pictured.

Please note: one tube has very tiny loose glasses floating around inside the glass envelope.

Condition:
No original boxes, selling as low hours used tubes

Silk-screening:
Please refer to photo(s)

Engraved designations on black bases:
C-327
C-327

Painted designations:
n/a
n/a

Date codes:
n/a
n/a

Tubes feature meshed plates and side-mounted very small 'round-cap' getters construction.

Tubes appear identical in construction.

*

Hickok TV-7B/U* tested

@ 38      38

min. : 25

*Hickok TV-7B/U is a mutual conductance(Gm) type tube tester. It does check for mutual conductance which is a more accurate measure of tube's age.

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*FantasticTubes !!!