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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: Output transformer/speaker load and active biamping posted by dumpingground on January 22, 2021 at 06:04:04:
Moving to tube power amps, will the amps directly connected to the tweeter/woofer panels be ok and present the proper speaker load to protect the tubes and output transformer?
in general, the question on whether a tube amp needs a load is one that is confusing. The simple answer is if the amp has a pentode output then yes and if it is a triode output then operating into an open load isn't a big deal.
The slightly more complicated explanation involves drawing a horizontal loadline on a set of triode and pentode curves and looking at the resultant full scale voltage swing. In both cases you get close to the full µ of the tube which is slightly more than the loaded µ in a triode and substantially more in a pentode. This is why guitar amps are set to short the outputs when the load (speaker) is unplugged. this gives essentially a vertical loadline making the output stage incapable of swinging any volts due to the µ of 0 whereas a 6L6 into an open load has a µ of close to 200. Taking a 10V drive into a purely inductively loaded stage with a gain of 200 has the possibility of generating very large voltage spikes which tends to be bad news for magnet wire insulation and output transformers in general.
dave
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- RE: Output transformer/speaker load and active biamping - dave slagle 06:59:55 01/25/21 (0)
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