A simple headphone adapter for a tube amp is non-inductive 8 ohm resistors placed across the outputs and then another resistor to each channel of the headphone jack to knock the output down a bit. Are there any commercially made amps that could be damaged by this because the outputs do not have a common ground?
An example of an amplifier that can be damaged:
Bridged amplifiers, the outputs both have signal voltage versus ground.
Do not tie these together, such as trying to use a 3 wire set of headphones.
Perhaps that is something for headphone marketing, headphones with 4 wires, so they can be used with bridged amplifier outputs.
Bridged amplifiers, the outputs both have signal voltage versus ground.
Do not tie these together, such as trying to use a 3 wire set of headphones.
Perhaps that is something for headphone marketing, headphones with 4 wires, so they can be used with bridged amplifier outputs.
Icsaszar,
I simply answered the original poster's question.
True, bridged amplifiers are rare.
But burning them out by improperly connecting them up is not very rare, compared to the proportion of burning out non-bridged amplifiers.
I have not knowingly seen any amplifier that is not bridged, that is going to be ruined by connecting the common terminals together at the headphones.
Yes, there are Lots that will have a problem, but I never saw one.
As always, I suggest that Original posters give lots of details in their original posts.
In this case, a mention of the amplifier model would have been be helpful.
But if the idea is to make a universal conversion to headphone use with all amplifiers, that is a completely different matter.
A capacitor connected to a step-down transformer primary will work for bridged amplifiers, and for non-bridged amplifiers (IF they are stable with such a reactive load).
Universal products are Expen$ive, and are not simple.
Just my $0.03
I simply answered the original poster's question.
True, bridged amplifiers are rare.
But burning them out by improperly connecting them up is not very rare, compared to the proportion of burning out non-bridged amplifiers.
I have not knowingly seen any amplifier that is not bridged, that is going to be ruined by connecting the common terminals together at the headphones.
Yes, there are Lots that will have a problem, but I never saw one.
As always, I suggest that Original posters give lots of details in their original posts.
In this case, a mention of the amplifier model would have been be helpful.
But if the idea is to make a universal conversion to headphone use with all amplifiers, that is a completely different matter.
A capacitor connected to a step-down transformer primary will work for bridged amplifiers, and for non-bridged amplifiers (IF they are stable with such a reactive load).
Universal products are Expen$ive, and are not simple.
Just my $0.03
I think a larger general search is in order. Ebay, Craigs list, for example.
There were Lots of Commercial Bridged versions of mono-block amplifiers, and stereo amplifiers in the past.
Any adapter that is Universal has to deal with past products.
There were Lots of Commercial Bridged versions of mono-block amplifiers, and stereo amplifiers in the past.
Any adapter that is Universal has to deal with past products.
Any adapter that is Universal has to deal with all past current and future products, and also all past current and future law requirements. Causing hearing damage could be expensive.
No headphones are required to damage your hearing.
Many stereos can do that, if you listen too loud for too long.
The federal standards for safe levels versus time . . . you may find that they are not conservative enough; at those levels, your hearing may suffer.
Many stereos can do that, if you listen too loud for too long.
The federal standards for safe levels versus time . . . you may find that they are not conservative enough; at those levels, your hearing may suffer.