• 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.

ID this mystery twin triode?

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cogsncogs

cogsncogs

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Joined 2003
FlaCharlie said:
I've heard that the 6EU7 has a spiral heater which is supposedly similar to a 7025. Not sure why they would use both it and a 12AX7 in the same unit either. They did use 6EU7s a lot. Could it be that the bean counters figured there would be less labor cost if only two heater pins were involved??
Click to expand...
Spiral heater and basing arrangement for lower hum in low-level stages.


Description from GE data sheet:
 

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6A3sUMMER

Member
Joined 2016
All versions of the JJ 12AX7/ECC83 have Spiral Filaments (short plates, long plates, gold pins, and regular pins).

All those tubes are re-tested, including for noise, before they are shipped from Eurotubes.com.
Get them there.
They are in the US, but ship to some overseas locations too.
 
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