Hey, I just got new tubes for my Laney, just curious, I have a bias probe on order, is it ok if I throw the new tubes in now and bias it when the probe gets here?
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Chances are you wont have any issues other than a lack of tone if the tubes are colder than the bias is currently set or on the other hand they may be hotter and require a reduction in bias or you may blow them. Most of the time youll be ok. Throw em in, fire it up and if the amp sounds ok and theyre not glowing to brightly youll be fine til your probe arrives.HTTP 404 - Signature Not Found
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Originally posted by Chief_CrazyTalk View PostI replaced the GT pair in my amp when one went out with a similarly rated pair of GTs and it's fine. Sounds just like it did before.
It's been a couple of months and I still haven't biased it, but really need to look into doing that.
I didn't see the OP saying anything about buying GT's.
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I went with JJs. I noticed they were glowing a lot brighter than what was in there, but I'm pretty sure it was the stock tubes, which means they were about 25 years old. This is my only tube amp, so I have no idea how much they should glow.
I played it for about 30 minutes with no problems, but would feel better if my bias probe got here!
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I retubed my JMP-1 and 9100 Power Amp 2 years ago with JJ's and I did bias them with the help of a buddy (Electrical Engineer - I am a mechanical). I could hear a very slight difference in sound after. For the cost, I am not sure it was worth the effort but I bought the gear used so I thought it was the best thing to do.
The 9100 was a PITA since they have a lexan cover over the bottom of the amp. To get it off would have been a REAL PITA, so we drilled to small holes thru it to gain access to the bias pots. I don't remember much of an adjustment. I do remember reading that if you don't bais the tube you may reduce the life.
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