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Post subject: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 5:48 pm
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Hi fellow bass people. I have a 1976 Fender Bassman 100 which I am currently running through a Traynor 810 cab. Needless to say, it is massive. I'd like to run a second Traynor 810 cab as well. I know it sounds greedy but so what. I play in a very bass heavy band. The Traynor cabs look to be 4ohms. Can the Bassman handle two? Thanks.


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 6:28 pm
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Pretty sure that 4 Ohm is the minimum load for that head. That means you can use two 8 Ohm cabs but you can't use two 4 Ohm cabs. Sorry.


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 6:55 pm
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BD is correct -- the total minimum impedance load for the Bassman 100 is 4 ohms, according to the schematic......

http://elektrotanya.com/PREVIEWS/634632 ... .pdf_1.png

Rewiring your Traynor cabs might be possible, or running them in series at 8 ohms total (the amp will not develop its full rated power in this configuration).

Arjay

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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 6:57 pm
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This saddens me greatly. Oh well. It's not like one 810 cab isn't already pretty massive sounding. Thanks.


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 6:59 pm
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I'll look into the running two cabs in a series idea. Thanks.


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 7:03 pm
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If you can trade up to a Bassman 135, that amp permits nearly any speaker load down to 2 ohms.

I believe the original Super Bassman had that capability as well.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 8:18 pm
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That is one advantage to the new tube heads. Both the new 100 and Super heads will do 2 Ohms I think. There is a switch that enables a 2 Ohm load on the new ones. I believe that feature was carried over from the Sunn/Fender Bassman 300 Pro. The Super appears very similar to the 300 Pro.


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 8:55 pm
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I was just reading in some other forums that the old Fenders that show a min. 4 ohm load actually run better with a 2ohm load. Obviously this is the answer that I want to hear, but I'm not so sure that I want to test the theory. What would happen?


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Post subject: Re: 76 Bassman 100 and Traynor cabs?
Posted: Sun Oct 27, 2013 11:12 pm
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Speaker impedance decreases proportionally with a decrease in the fundamental frequency of the input signal (speaker manufacturers commonly determine the nominal design resistance of a voice coil using a single 400Hz tone). Thus, with a bass instrument it's possible that the amp's output tranny might be operating at or near a "dead-short" condition with a low E note pushed at high power into a 100% mismatched load such as that. Damage could be the result and often is.

Arjay

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