telefunken: REN904, REN1104, REN1004 question

I see the schematics call for two REN904.  The Aluminum plate on my 40W calls for a REN1104 and a REN1004.  What is the difference please.  The other fun difference on min is the instructions are in Chech.

Regards and thank you,

Donald

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After 1930/31 the three triodes REN 804, REN 1004 and 1104 were substituted by the standard triode REN 904. So in the later literature only REN 904 can be found. The original valves are REN 1104 and REN 1004. If they are not availbale you can use REN 904 without problems which differ slightly in its data, however can be changed without problems.

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Many many thanks for the information.  

Best regards,

Donald

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