Pair of W5H ZENITH (IT) WW2 5-Watts AF/RF- medium power triodes tested very good

Description

Pair of W5H ZENITH (IT) WW2 5-Watts AF/RF- medium power triodes tested very good
Description W5H: 5 Watts power triode, indirect heated (4,0 Volts, 1,1 Amps), usable as single-ended and push-pull PA in RF- or AF- amplifiers and as oscillator. The W5H was developed and produced by ZENITH in Monza, Italy, during WW2 times for applications of "public authorities". The tubes offered have labels of the Italian Ministry of Finance, dated on Sept. 1942.  Unfortunately I could not find any comprehensive datasheet and information on the original purpose of this tube. They remind me a little bit of the Telefunken RS248, a variant of the RL12T15, but that tubes are more powerful. The most informative website on W5H seems to be  *).  An application in an audio class-A SE power amp. I found on the Japanese website
http://triodeamp.web5.jp
, there you can download a pdf of the "W5H project" from **)
Condition: Unboxed, used, but in good condition without visible mechanical or electrical defects and without gas. The emission tests showed very good results:
Measurement of emission according to the data of the point of operation given at *) :
at U_plate= 250 Volts, U_g1= -20,0 V, U_h = 4,0 VDC;  I_plate_100% = 20,0 mA :
Results:
Tube  #132118:  I_plate = 36,0 mA (= 180%)
Tube  #132538:  I_plate = 35,0 mA (= 175%)
*)    https://www.radiomuseum.org/tubes/tube_w5h.html
**)  http://triodeamp.web5.jp/amp_1/w5h.pdf
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Achtung! Privatverkauf meiner Röhrensammlung!
Nur deshalb verkaufe ich die Röhren ohne Funktionsgarantie und Rücknahme als DEFEKT !
Attention! This is a private sale of my tube collection!
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, registered and with tracking service up to a total weight of 2,0 kg with German DHL-Service for 14,00 Euro.
World Wide Shipping outside EU  ***):
Packaging and shipping, registered and with tracking service up to a total weight of 2,0 kg with German DHL Standard Package for 22,00 Euro.
***) Attention:
The private shipping of parcels and packages with the German DHL shipping service from Germany to "overseas countries" is possible again in most cases! But because of health control measures and/or the decline of international airfreight capacities the shipping can be restricted or more expensive or can take more time than usual! This applies to some Amercian and Asian countries and can change at short notice.
You are welcome to ask me for the conrete shipping conditions for your destination country before you bid! And 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 and
WAIT FOR MY INDIVIDUAL INVOICE !!!
I
basically
do not ship without registration, insurance and tracking services!
Combined shipping:
I support combined shipping as far as possible.