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Questions about tubes and gear that glows. FAQ

RE: if you need tubes check Guitar Center, Sweetwater, Musicians Friend etc

Yes. Originally, they came in a 1-10 scale which was based on current draw. The 10's were the cleanest, and required the most negative grid voltage. The 1's drew more current with a given amount of grid bias. They had less clean headroom before breaking up.

Later, they changed to three ranges, low mid and high.

The higher numbered ones worked better for hi-fi equipment.

I didn't use many of their power tubes. I bought large quantities of Sovtek and matched them myself.

I did like their GT preamp tubes, though. Supposedly they listened to each tube and rejected a good percentage of them because of noise or microphonics. They were guaranteed low noise.


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  • RE: if you need tubes check Guitar Center, Sweetwater, Musicians Friend etc - Alpha Al 17:05:33 05/13/23 (0)

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