Description
Well matched pair of EL504 SIEMENS 16 Watts high-voltage Power Pentodes, NOS, (~ 6GB5 ) Description EL504 ( ~ 6GB5 = EL500) :The EL504 is an indirectly heated (6,3 Volts, 1,35 Amp.) 16 Watts Power Pentode, designed for operating at high plate voltages. The peak plate-Voltage is 7,0 Kilovolts. The EL504 was particularly designed as line output tube in TV sets, but can be used as audio power output tube in single-ended and push-pull output stages as well (see - for example - the blogspot at **). Disregarding the higher max. plate dissipation of 16 Watts compared to 12 Watts, the EL504 obviously is essentially equal to the EL500 = 6GB5. Disregarding the different heater data (6,3 V / 1,35 A compared to 27 Volt / 0,3 A) the EL504 is equal to the PL504. For more technical information please download the Philips datasheet of the PL504 from *) Both EL504 tubes have been produced by Siemens, not in the former Yugoslavia, but in Munich/Germany. This is indicated by the symbol ? , a special character within in the six-figure factory code that is imprinted in very small, grey letters on the outer side of the glass bulbs of both tubes. Condition: The tubes are boxed in original Siemens boxes. The boxes havent been sealed by factory. Thats why I could take off the tubes from the boxes and make photos and short function tests and emission measurements according to the test parameters on testcard #1216 for EL504 of the FUNKE-W19 tubetester: Both tubes are in very good condition with very good emission values, see below. Measurements: All measurements have been performed after a burn-in for 10 minutes and a very short, final measurement run with the chosen test parameters below, while overloading the tubes momentarily. Emission measurement in zero bias mode (U_g1=0 Volts) as follows: - U_plate = 200 Volts, Ug_2= 60 Volts, Ug1 = 0 Volts - The 100%-value of I_plate is 113 mA (emission = very good). Emission is good for I_plate ? 68 mA. Results: Tube #2.1: I_plate = 145 mA = 128% of 113 mA ==> very good Tube #2.2: I_plate = 145 mA = 128% of 113 mA ==> very good References: *) https://frank.pocnet.net/sheets/010/p/PL504.pdf **) https://hobbyhifi.blogspot.com/2019/09/el504-und-co.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Achtung! Privatverkauf meiner Röhrensammlung! Deshalb verkaufe ich die hier angebotenen Röhren an Empfänger in Deutschland nur wie oben beschrieben und mit einer Funktionsgarantie nicht über 30 Tage hinaus!Attention! This is a private sale of my tube collection! Thats why I sell the tubes to customers outside Germany only as described above and with a warranty for not more than 14 days. Versand / Shipping:Innerhalb Deutschland im versicherten Paket mit DHL (7,50 Euro) oder Hermes (6,30 Euro) , Zusendung an DHL-Abholstation oder -Paketshop möglich! Andere Versandarten bitte anfragen! Angegebene Versandkosten beinhalten Verpackungskosten!International bidders are welcome! Shipping possibilities: 1. EU countries: Packaging and shipping, registered and with tracking service up to a total weight of 2,0 kg with German DHL-Service for 15,00 Euro. 2. World Wide Shipping outside European Union : 2a) Packaging and shipping, registered and with tracking service up to a total weight of 2,0 kg with the German DHL small package service for 19,00 Euro to Switzerland and U.K. 2b) Packaging and shipping, registered and with tracking service up to a total weight of 2,0 kg with the German DHL “small package service” to other countries outside the European Union for a shipping fee of 24,00 Euro in case of most destination countries worldwide. Before you make your purchase please ask me, if your country of destination is among this group of countries! If not, then the case 2c) will apply. 2c) Packaging and shipping, registered and with tracking service up to a total weight of 5,0 kg with the German DHL “standard package service” for a fee up to 48,00 Euro.The final fee depends on the country of destination. Please ask me before you make your purchase!Attention! Of course it is possible to ship small parcels with DHL or other companies for lower shipping fees from Germany to most countries in the world, but then without any services additional to the bare shipping service! Please take notice of my shipping principles here, caused by bad experiences in the past: I generally do not ship without registration and tracking services! Combined shipping: I support combined shipping as far as it makes sense and is possible.
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