QUAD FOUR GE 6550 VACUUM TUBES

Four GE 6550 vacuum tubes as pictured. Tested for performance in my Heath W-6M amplifier and all four may be used interchangably.
Tested fine for emissions also, but the real test is dynamic performance...
Look at the picture closely. one of the keys was snapped in removal.
That does not affect the functionality, but care must be exercised in the insertion of that one so as not to insert incorrectly.
These will work great in your Citation, Heath, Scott or other amp.