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Slovenská pošta
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Dear customer / Vážený zákazník,

we would like to inform you, that due to the current situation concerning the COVID-19 pandemic, we will be able to deliver our items only to the following countries: Slovakia, Czech republic, Belarus, Estonia, Finland, Canada, Latvia, Lithuania, Germany, Austria, Slovenia, United States and Ukraine. Effective Thursday, March 26, 2020, until further notice. We are very sorry for this unfortunate situation and wish you all the best in the upcoming days.

z dôvodu pandémie COVID-19 vieme zabezpečiť doručovanie zásielok len do nasledujúcich krajín: Slovensko, Česká republika, Bielorusko, Estónsko, Fínsko, Kanada, Litva, Lotyšsko, Nemecko, Rakúsko, Slovinsko, Spojené štáty americké (U.S.A) a Ukrajina. S platnosťou od 26.3.2020 až do odvolania. Vzniknutá situácia nás veľmi mrzí a držíme Vám všetkým palce a prajeme veľa síl do nadchádzajúcich dní.

Best regards / S pozdravom RETROSTORE.EU
double diode - pentode UBL21 - (NIB)

UBL21 is a double diode - output pentode. The sensibility of the pentode system is very high. It is suitable for usage in different types of amplifiers. Indirectly heated cathode is common for both of the systems. UBL 21 was also a part of many smaller radio receivers from Tesla factory ( 305U, 306U, 307U a 308U Talisman, T254, Rytmus, 504U-II Pionier, 401U Accord, 402U, 405U Standard a others). New old stock tubes, new in box. Tubes are packed in vintage Tesla boxes. Tested on BM215A. 
(we reserve the right to change the description and specifications without prior notice)