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When two identical mono tube power amps have their outputs wired in parallel, what effect does this have on the damping factor, ie does the damping factor double or remain the same? Thanks.
Follow Ups:
The true one will most likely not change much at all.
The marketing one will double... if that means anything.
The amps must be identical and the same signal present at both inputs.
This will double the damping factor if feedback is employed. For proper matching, for an 8 Ohm speaker you would use the 16 Ohm taps.
You cannot do this with a solid state amp- they have to be bridged instead of mono-strapped else damage will occur.
Thank you for conformation, I have been using two rebuilt(Jim McShane parts) operating as mono bloc amps each driving a JBL Sovereign speaker, for many years.
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Cit 1, 2, 3 and a Empire 598? Nice!
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I am over fifty years behind time and very happy to be there!
The Empire responds very well to mechanical damping. You'll hear the result of damping the platter right away.
I used the model 208 since it was easier to install a modern arm. I kept working on damping it and finally had a plinth machined of solid aluminum but otherwise allowed the Empire parts to be mounted. The platter was heavily damped. All these changes affected the sound of the turntable, in particular the bass impact.
We parallel them all the time.
I'm sure you're aware that most solid state amps won't survive that sort of treatment.
Very true, two Solid State amps wired in parallel "CAN" be high risk.
I've had an amp with a "DC coupled output" smoke when an impedance matching transformer was hooked up to it. The DC offset from the amp caused a moderate DC current to flow in the transformer and thus also flow through the amp's output stage. This DC current made the amp hotter. The hotter amp's DC offset got larger thus making the amp get even hotter and eventually "Poof", a dead amplifier. In this case, the solution was to put a very large non-polar cap in series with transformer.
Two "DC coupled output" amps wired in parallel can have a similar risk. If the outputs had different "DC offsets" or different voltage gains, one amp will drive power into the other amps that is lost as heat.
There are solid state amps "made" to be used in parallel. These amps won't have this issue.
Moral of the story: Know thy circuit and carry a big soldering iron. ;-}
Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.
. . .Oh!. . .Remember: Modifying things voids their warranty.
There was once a story about a gent who put 4 Citation II's in parallel, all bridged to drive 8R loads. He described a condition where one amp got quite unhappy when the other three started driving it( perhaps an input signal failure? ).
The pic of the 8 Deuces on a custom rack was pretty cool.
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Some tube amps will blow up with such connection, some solid state models will run happily.
Like I said - depends on topology.
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