Pair of CV54 (U.K.) WW2 Half Wave Vacuum Rectifier Tubes, "very good"

Description

Pair of CV54 (U.K.) WW2 Half Wave Vacuum Rectifier Tubes, "very good"
Description CV54:
Half wave vacuum rectifier tube, direct heated (4,0 VAC, 1,2 Amp), max. input = 2,5 kVAC; output = 60 mADC  resp. 120 mA for 2x CV54 in full wave circuit. For more technical information see http://www.r-type.org/pdfs/cv54.pdf.
The CV54 was designed for military applications only (power supply of radar equipment) and obviously hasn't got a civil equivalent. Similar tubes, but with indirect heating and slightly different other quality are VU133 = CV1133 = SU41, a similar civil tube with direct heating, but with only 30 mADC output being half as powerful as CV54, is the OSRAM tube U17 for the voltage supply of cathode ray tubes.
Condition:
Unboxed, used, but in good condition and looking like new, apparently free of mechanical and electrical damage as well as of gas. The emission of both tubes is "very good" *), but because of the lack of an I_plate/U_plate-curve cannot be rated in % of a given index value.
*)  Tested with the follwing parameters: U_plate = 50,0 VDC, U_h = 4,0 VAC
Results:
Tube #1: I_plate = 110 mA;  Tube #2: I_plate =  104,0 mA
===>  very good,
because the test criterium at **) says: The tube is good if I_plate >= 60 mA @ U_plate <= 50 VDC.
The tubes offered show I_plate >= 104 mA @ U_plate = 50 VDC !
**)  http://www.r-type.org/pdfs/cv54.pdf
Achtung! Privatverkauf!
Deshalb verkaufe ich die Röhren außerhalb Deutschlands ohne Funktionsgarantie und Rücknahme als DEFEKT !
Attention! This is a private sale!
That's why I sell the tubes without warranty and return as DEFECTIVE!
Versand / shipping:
Innerhalb Deutschland
im versicherten Paket mit DHL oder Hermes, Zusendung an Abholstation möglich! Andere Versandarten bitte anfragen! Angegebene Versandkosten beinhalten Verpackungskosten!
International bidders are welcome!
Shipping possibilites:
EU countries:
Packaging and shipping, insured (up to 500 €), registered and with tracking service up to a total weight of 2,0 kg with German DHL-Service for 16,00 Euro.
World Wide Shipping outside EU
***)
:
Packaging and shipping, insured (up to 50 €), registered and with tracking service up to a total weight of 2,0 kg with German DHL-Service for 22,00 Euro (reduced price for shipping to U.K. and Switzerland: 19,00 Euro).
***) Attention:
Because of the worldwide health control measures and/or the dramatic decline of international airplane traffic the private shipping of parcels and packages with the German DHL shipping service from Germany to "overseas countries" is actually restricted or more expensive or takes much more time than before! This applies to some Amercian countries including the U.S.A. and Canada as well as to Australia, New Zealand, Thailand and others.
You are welcome to ask me for the conrete shipping possibilities for your destination country before you bid! When you have bought the article please
DO NOT PAY IMMEDIATELY
after reception of EBAY's automatically generated purchase confirmation notice, but give me the time to check the actual shipping situation with DHL.
PLEASE WAIT FOR MY INDIVIDUAL, FINAL INVOICE IN ANY CASE!!!
I generally do not ship without registration, insurance and tracking services!
Combined shipping:
I support combined shipping as far as possible.