I also have these tubes and if NOS they will require a minimum of 30-40 hours, or so, of use for the bass to kick in and for them to open up. In gear that runs them easy you may have to double this - plus. Just to say, give them some time. This was one of my favorites in the input section of a SET amp that I no longer own. Very odd for Amperex 6922 types to take this amount of time/use in order to open up, but this has been my experience with them.
7308 tube code question
I just received 10 NOS Amperex 7308 from my father. Each tube has the following markings:
All lettering in white
USN-CEP
A white triangle like symbol
VR5 *5B etched in the glass
The only nomenclature that I am familiar with is the USN = US Navy. What does the rest mean? What do people think of these tubes in a phono section of a pre-amp designed to take 6DJ8's
All lettering in white
USN-CEP
A white triangle like symbol
VR5 *5B etched in the glass
The only nomenclature that I am familiar with is the USN = US Navy. What does the rest mean? What do people think of these tubes in a phono section of a pre-amp designed to take 6DJ8's
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- 10 posts total
- 10 posts total