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Questions about tubes and gear that glows. FAQ

RE: 5R4 GY coke bottle and 5R4 GYA and other 5R4

The GZ34/5ar4 is indirectly heated. The 5r4 is directly heated.
Directly heated tubes are ready to conduct almost immediately once you throw the switch.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


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