• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

ECL8? Is this the proper name of this tube?

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I bought some NOS and got some gems, I think. I don't know how to wire them, and this is one. Three inches or so, 9 pin mini, looking data sheet. I also have a great looking Amprex with the ID wiped off of it, but looks pretty as can be..
Any help?
 
I can't get the pics to upload, but they are stamped on the inside with a 6 at the top. Does that mean they are a ECL8-6? And if so, are they power tubes, and do you maybe have a good schematic for a guitar amp. I will work on getting the pics up.
 
Hi,

Sorry for hi-jacking this thread but does anyone know of a listing stating what the C and the L part of the ECL series actually are?
I know I had this figured out at one point time time but must have lost the data.

And, for that matter, the dissimilar triodes in the US valves?

TIA, 😉
 
Frank,

The C stand for triode and the L stands for pentode, in European nomenclature.

There's little rhyme or reason to the letters in U.S. nomenclature. The 1st number is the filament voltage and the last number is the "element" count. What constitutes an "element" can be unsettling. Take the 6BQ5 (EL84), in which g3 is hard wired internally to the cathode and, therefore, the cathode and g3 constitute 1 "element".
 
I think what Frank is asking is from which C and L systems the various combi valves are made up.
For example: the ECL82 has a triode section with mu 70, just like an ECC81 (isn't the same as the Ri is different) and the power pentode is similar to...
 
ScheduleWon said:
I can't get the pics to upload, but they are stamped on the inside with a 6 at the top.
If there is a metal tag inside with a number stamped on it then this probably means they were made in the Tungsram factory in Hungary. A 6 here does not imply ECL86.

As others have said, find the factory code near the base. To understand it Google 'Philips factory codes'.

The triode and pentode in an ECLxx valve were sometimes based on other valves, sometimes not. For example, ECL86 contains half an ECC83. I am not aware of a list of these.

Try to get some pics up for us to look at. However, note that there are variants with different heater voltage/current and these may look identical to each other.
 
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