kieranmay1
New member
I've recently ordered a Hiwatt Lead 50 head since I saw it for a great deal on Ebay, I was just wondering if this head is self biasing or not, thanks.
Hiwatt Lead 50 Head
- Thread starter kieranmay1
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vinta9e
New member
Re: Hiwatt Lead 50 Head
Outside of Randall Smith's mind, fixed bias does not equal non-adjustable.
Outside of Randall Smith's mind, fixed bias does not equal non-adjustable.
Pilatvs
New member
Re: Hiwatt Lead 50 Head
As has been said: fixed bias doesn't mean "non-adjustable". Most fixed bias have a variavle resistor (pot) to adjuste the bias current. Mesa are an exception as they "fixed" their fixed bias, to make sure you use tubes that complement your amp properly (i.e. sell you their tubes).
As has been said: fixed bias doesn't mean "non-adjustable". Most fixed bias have a variavle resistor (pot) to adjuste the bias current. Mesa are an exception as they "fixed" their fixed bias, to make sure you use tubes that complement your amp properly (i.e. sell you their tubes).
trevorus
Modsterbator
Re: Hiwatt Lead 50 Head
There's a few different methods of actually doing the adjustment, but the basic procedure is using a potentiometer in the amp that sets the bias voltage to the power tubes. Using a multi-meter, possibly a bias probe type device. Some amps do not have a potentiometer to allow that adjustment, and often can be modified to have them.
Fixed bias just means it's set and doesn't change, generally; whereas cathode bias is set by the tube through a different sort of arrangement that is not necessarily fixed.
There's a few different methods of actually doing the adjustment, but the basic procedure is using a potentiometer in the amp that sets the bias voltage to the power tubes. Using a multi-meter, possibly a bias probe type device. Some amps do not have a potentiometer to allow that adjustment, and often can be modified to have them.
Fixed bias just means it's set and doesn't change, generally; whereas cathode bias is set by the tube through a different sort of arrangement that is not necessarily fixed.
Demanic
PenultimateTone Member
Re: Hiwatt Lead 50 Head
Ah, now I get it. I was wondering because I have an old Carvin x amp and when I changed the tubes out a few years back and went to set the bias, I discovered that it didn't have any sort of pot, just a resistor. Now that it's getting time for another re-tube, I figured I would ask how one should go about setting the bias in such a case.
Sent from my MotoE2(4G-LTE) using Tapatalk
Ah, now I get it. I was wondering because I have an old Carvin x amp and when I changed the tubes out a few years back and went to set the bias, I discovered that it didn't have any sort of pot, just a resistor. Now that it's getting time for another re-tube, I figured I would ask how one should go about setting the bias in such a case.
Sent from my MotoE2(4G-LTE) using Tapatalk
