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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: RE: Why do my NOS power tubes take so much to bias compared w/ new production? posted by Ed Sawyer on April 30, 2007 at 18:00:20:
thing is these tubes just do not "test" NOS they "look" NOS also. I've seen used El-34 power tubes where the getter flashing is nearly gone even though they still test fine. These arrived here over the years w/ perfect getter flashing and test results. Usually I look around the bottom of where the flashing ends and if it gradually fades away sort of hazy like versus a nice solid line where the flashing ends I know they have had no play time. Still yet, the Cary amp would bias them just fine, although Idid have to crank the bias way past where the Tung-Sol 6550 went or even the Visseaux 6L6 or Mullard El-37. The only tube that has to be cranked more is the 8417 power tube which will nearly wear your wrist out trying turn that darn screw!I understand your point though about changing teh resistor may make it hard to bias current production tubes. However, I've never used any current production power tubes since I went to tube amps anyway so for me it's not an issue as I don't plan on using them ever in the future either but it could be an isssue should I sell the amps later down the road. Think I would just have enough of a change to add a "tad" more to the bias, not a lot? Think I'll let the manufacturer give me the data on that one?
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Follow Ups
- They certainly LOOK NOS? - blazter 02:48:21 05/01/07 (0)
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