I'm back to fiddling with my 'ToneLego' pipedream project, and am looking at some architectural ideas. The overall mission is to build myself a fleet of the 'canonical' amps (AB763 Deluxe Reverb, 5F6A Bassman, JTM45, MarkI/II/III, AC30TB, and so forth) in a single rack and provide them with a switching platform so I can run several at a time. Each would be a low-power variant on its theme - 10 to 20 watts from EL84 or 6V6 sets.
Each would also need a good fake load to operate into - something like the transimpedance amp in the Fender PRA, but configured in 'silent' mode. The speaker sim takes the power amp's output, applies a freq/phase response and drives it back to the lower side of an 8-ohm resistor.
I've simulated their simulator and get a somewhat believable curve (SuperSpice - anasoft.co.uk), but Fender claims their model replicates the Jensen 10" in the PRA (which makes sense) - I'd like to add some other options.
Anybody got a frequency response for a 1960A 4x12 full of greenbacks? An oval-back Dumble 2x12? An EV-loaded TL806 or TL606? Not the response in air, you understand, but at the voice coil terminals.
Speaker Simulators
Moderators: pompeiisneaks, Colossal
Speaker Simulators
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Re: Speaker Simulators
I want to visit the ToneLego music palace when you're finished!
What part of the country you in at where, Don? Where the moose live?
What part of the country you in at where, Don? Where the moose live?
I build and repair tube amps. http://amps.monkeymatic.com
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Leo_Gnardo
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Re: Speaker Simulators
FWIW I was involved in the construction of "Bradshaw Rack" some time ago. The 'artiste' and I heard obvious differences when using resistors vs speakers as loads on the amps that were used as preamps in this rig. Marshalls - big difference, we used speakers. Mesa MkII amps , no difference, we used resistors, much more convenient. There's no pat answer. Gotta use your ears. Sometimes you can get away with using a simple resistor, hooray! Sometimes not. More work, more hassle but you wind up with a tone that satisfies your ears and that's what counts.
Sounds like a very ambitious project. I'm sure you'll be able to make it work for you.
Sounds like a very ambitious project. I'm sure you'll be able to make it work for you.
down technical blind alleys . . .
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Leo_Gnardo
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Re: Speaker Simulators
Somewhere near Wassamatta U? Or maybe here:xtian wrote:Where the moose live?
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down technical blind alleys . . .
Re: Speaker Simulators
11 states and 14 cities, so far (including NH). Indianapolis at the moment.Leo_Gnardo wrote:Somewhere near Wassamatta U? Or maybe here:xtian wrote:Where the moose live?