RCA 5Z4 Vacuum Tube Rectifier NOS NIB Short Base These tubes have steel support

These tubes have steel support rods

This trio of US-made 6CM7 tubes was tested on our Paul Hart-calibrated TV7 for shorts

This soft cover book is in good condition

Transconductance measured 40/40 for Tube One and 42/46 for Tube Two where minimum (65%) is 32/32

They measured 31

RCA 5Z4 Vacuum Tube Rectifier NOS NIB Short Base These tubes have steel supportThis new old stock, new in box RCA 5Z4 and another just like it tested to spec on on our Paul Hart calibrated TV7 U. The default setting is one; you must indicate the quantity you want. Etsy will indicate how many are available. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS.