2 US-Made 17D4 Vacuum Tubes NOS NIB Lot Of Two

2 US-Made 17D4 Vacuum Tubes NOS NIB Lot Of TwoThese two new old stock, new in box US made 17D4 tubes tested to spec on our Paul Hart calibrated TV7 U. 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. 1. MOST FORMS OF SHIPPING EXCEPT MEDIA MAIL ARE AUTOMATICALLY INSURED UP TO $100. ETSY PURCHASE PROTECTION COVERS ITEMS UP

Both tubes measured 30 where minimum (65%) is 22

They measured 48

round mica spacers

Tube one measured 45 in its triode section where minimum (65%) is 29 and 100% is 45

I am playing them in my Mini Mite 2013 and they sound great

This softcover book is in very good condition and comes from a non-smoking household

Fidelity is good

where minimum (65%) is 50/50 and 100% is 77/77

These six gray glass 12BY7 / 12BY7A / 12BV7 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 46:

They measured 31 and 32 where minimum (65%) is 28 and 100% is 43

It measured 38 in its triode section where minimum (65%) is 25 and 100% is 39

new in box GE 12BL6 tubes tested to spec on our TV7/U