2.7 ohms

[BadExample]

There are a few replies here who say it is fine to run a tube amp at a lower impedance than the rating on the amp.would a mesa prodigy be ok at 2.7ohms and would the warranty be honoured in the event of a problem.they are expensive amps to take a chance with.cheers.

With the money involved, I would only take the word of Mesa or @agedhorse You might also state which cabs you would like to combine. As RJ stated above, the nominal rating for impedance may not be really exact. Measuring the cabs DC resistance with a meter might be helpful if they are not Mesa cabs. This would be the minimum impedance (theoretically that only comes into play at 0 Hz). Also if you overdrive the output, that may come into play. I dunno, my tube knowledge was never great and now it's been rusting away since the early 80's.

 

[agedhorse]

You will notice that I use the terms safer rather than safe. There are degrees of relative safety, a lower impedance load below the rating is generally safer than above the recommended impedance, but neither are as safe as operating within the rated load specs.

Customer service can answer your questions regarding warranty coverage with these products.

 

[BassmanPaul]

A VOLTAGE change on the gate alters the current flow between the cathode and anode.

I just know you mean grid Andy! LOL

 

[agedhorse]

I just know you mean grid Andy! LOL

Yup, this is what happens when designing across device families. Terminal equivalents become a bit too universal

 

[Killed_by_Death]

Well, we were talking about the comparison to valves & gate valves are probably the most commonly used valves.

 

[Chrome Dome]

Well, we were talking about the comparison to valves & gate valves are probably the most commonly used valves.

Have a TE AH500-12 with the valve drive. Does this mean it has tubes? Thanks!

 

[Killed_by_Death]

Those use MOSFETs, not tubes, AFAIK
FET = Field Effect Transistor
like a gate valve

 

[Munjibunga]

I smell what you're stepping in, but this statement isn't accurate. Ohms law is.... a law. Not a suggestion, hypothesis, or theory. There aren't exceptions to Ohms law when it encounters different amplifier designs.
Back to basics for electricity: ohms is a measure of resistance. Voltage is voltage, current is current, and watts are watts regardless if it's tube or ss. ANY electricity is looking for the path of least resistance straight to a ground source.

If an amp is designed to be ran at 2 ohms regardless of its tube, as, or hybrid makeup, then by default the electricity will be "happier" with less resistance than a higher resistance.

Well, no.

 

[black cat bone]

Link Removed
well after a year of deliberation im no further forward.i was keen on the prodigy but as they have ceased production i have ruled it out.still fancy a tube amp though.maybe fender if i could get to try one but they are thin on the ground over here.i would prefer used then i would make an amp sleeve to match my cabs.the search goes on.thanks for all the replies even though some are beyond my technical knowledge.

 

[leftyc]

Just purchased an amp (no tubes) that says 2.7 is the lowest load. A 4 ohm cab and a 8ohm would be 2.667.
Is it safe since it is so close?

 

[agedhorse]

Just purchased an amp (no tubes) that says 2.7 is the lowest load. A 4 ohm cab and a 8ohm would be 2.667.
Is it safe since it is so close?

Yes, that’s fine.

 

[leftyc]

Thank You Sir