4 Philco Number / Type 41 #41 Vacuum Tubes Valves Clear Bottle Lot Of Four Gray Glass This hardcover book is in

This hardcover book is in fair condition

Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40

This lot of six Zenith number / type 58 stamped- / engraved-base tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box US-made 9003 / JAN-CKR-9003 / VT-203 / JRC9003 tubes tested to spec on our on our Paul Hart-calibrated TV7/U

It is dead quiet when the preamp is muted and have excellent frequency response and dynamics

4 Philco Number / Type 41 #41 Vacuum Tubes Valves Clear Bottle Lot Of Four Gray Glass This hardcover book is inThese four Philco clear bottle type number 41 tubes tested as follows on our Paul Hart calibrated TV7 U: 42, 56, 58 and 60 where minimum (65%) is 40 and 100% is 62. BECAUSE OF THE BIZARRE, INTRUSIVE, CRUEL AND DRACONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH THEM WE NO LONGER SHIP TO GERMAN ADDRESSES. WE WILL HAPPILY SEND YOUR PACKAGE TO A NEIGHBORING COUNTRY OR MAKE SUITABLE ARRANGEMENTS. IN 2021 WE