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#1
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
help setting bias for a sound valve amp please tell me how
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#2
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
"hydebee" wrote in message ... help setting bias for a sound valve amp please tell me how apply a sine wave input then watch the output on a scope,,, adjust until there is no "clipping" and least distortion |
#3
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
philo wrote: "hydebee" wrote in message ... help setting bias for a sound valve amp please tell me how apply a sine wave input then watch the output on a scope,,, adjust until there is no "clipping" and least distortion I have to disagree with this over simplistic advice. The bias setting wanted is most likely the setting for output tube idle current. The biasing is the adjustment of the grid dc voltage without any signal present and this controls the anode current within the tube such as EL84, 6L6, 6V6, EL34, JT66, KT88, 6550 or whatever output tubes are in the amp. Bias setting is different for all the tube types, and some amps have one bias setting adjust pot for 2 or 4 output tubes, some have individual bias adjust pots. If the bias is not set correctly the tubes couls melt down and cause damage, maybe even burn the house down. The biasing method should be described in the owner manual for that amp. But we need to know what amp you have before we offer any firm advice. Patrick Turner. |
#4
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
"Patrick Turner" wrote in message ... philo wrote: "hydebee" wrote in message ... help setting bias for a sound valve amp please tell me how apply a sine wave input then watch the output on a scope,,, adjust until there is no "clipping" and least distortion I have to disagree with this over simplistic advice. The bias setting wanted is most likely the setting for output tube idle current. snip Yep...you are probably right but I think you've read a bit too much into the very sketchy question |
#5
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
philo wrote: "Patrick Turner" wrote in message ... philo wrote: "hydebee" wrote in message ... help setting bias for a sound valve amp please tell me how apply a sine wave input then watch the output on a scope,,, adjust until there is no "clipping" and least distortion I have to disagree with this over simplistic advice. The bias setting wanted is most likely the setting for output tube idle current. snip Yep...you are probably right but I think you've read a bit too much into the very sketchy question Indeed the OP question was sketchy. I a smoke avoiding person though. Patrick Turner. |
#6
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
snip Yep...you are probably right but I think you've read a bit too much into the very sketchy question Indeed the OP question was sketchy. I a smoke avoiding person though. Always best to err on the side of caution... I've sure gotten a few plates red-hot from time to time... but never had a melt-down yet! |
#7
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
philo wrote: snip Yep...you are probably right but I think you've read a bit too much into the very sketchy question Indeed the OP question was sketchy. I a smoke avoiding person though. Always best to err on the side of caution... I've sure gotten a few plates red-hot from time to time... but never had a melt-down yet! If ever a BJT gets that hot, its waaaaayyyy tooooo late, we have silence. Then the tube recovers after cool down, and that's the upside of some hot things,,, Patrick Turner. |
#8
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
Always best to err on the side of caution... I've sure gotten a few plates red-hot from time to time... but never had a melt-down yet! If ever a BJT gets that hot, its waaaaayyyy tooooo late, we have silence. Then the tube recovers after cool down, and that's the upside of some hot things,,, I think the red-hot plates were back in the old days when I used an 807 fed by a 6AG7 on my ham transmitter... I don't think there was any way you could kill an 807 ! |
#9
Posted to rec.audio.tubes
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help setting bias for a sound valve amp
"hydebee" wrote in message ... help setting bias for a sound valve amp please tell me how Doesn't your Sound Valve have 2 pairs of LEDs with an adjustment in between on the front panel? west |
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