bassman 6g6b ohm question
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bassman 6g6b ohm question
my bassman head is 4 ohms, I only have 8 ohm cabinets - can I add a 8 ohm dummy load to the external speaker jack- with the 8 ohm cabinet connected and get a 4 ohm load to the amp?
- martin manning
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Re: bassman 6g6b ohm question
You need an 8-ohm load in parallel with the speaker, so yes. And you'll get about half the power out.
Re: bassman 6g6b ohm question
thanks- would this be better for my amp then running the mismatched impedance? (4ohm amp into 8 ohm cabinet) thanks for the help
- martin manning
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Re: bassman 6g6b ohm question
Many people will say miss-matching by a factor of two is ok, but I wouldn't do it.
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Re: bassman 6g6b ohm question
From hughes and kettner, I've read this and it seems to fit with my general understanding as well:
http://blog.hughes-and-kettner.com/ohm- ... impedance/
~Phil
http://blog.hughes-and-kettner.com/ohm- ... impedance/
~Phil
tUber Nerd!
Re: bassman 6g6b ohm question
thanks for the info - i'll try a dummy 8 ohm load in parallel with the speaker cab tomorrow and see how it sounds. I've used my bassman head for years with the mismatch but never felt comfortable about it.
Re: bassman 6g6b ohm question
A 16 ohms parallel load is plenty good. merely running a 8 ohm load into the 4 ohms secondary, by contrast, may stress the screens (depending on voltages, tubes etcs) and will reduce the power by ca 30% and you will loose some bandwidth.
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Re: bassman 6g6b ohm question
so 16 ohm with my 8 ohm cab gives me 5.3 ohms- right? which means less volume and detail loss- yes? better for my amps output transformer?
I tried the 8 ohm load and noticed less volume and less high end. the output transformer stayed cool to the touch but the load I made ( 8 ohm 100 watt Xicon resistor) got up to 175 degrees after about an hour of use. thanks again for the help
should I use something like this instead? - https://www.mouser.com/ProductDetail/AR ... eqMtbnA%3D
I tried the 8 ohm load and noticed less volume and less high end. the output transformer stayed cool to the touch but the load I made ( 8 ohm 100 watt Xicon resistor) got up to 175 degrees after about an hour of use. thanks again for the help
should I use something like this instead? - https://www.mouser.com/ProductDetail/AR ... eqMtbnA%3D