BHK Preamp maximum input voltage?

I wasn’t able to find in specs, manual or forums. Does anyone know what, if any, the upper voltage limits are on the XLR and RCA inputs on the BHK Preamp?

John Atkinson did the measurements, I think it clips at 29V into 100k ohms.
PS Audio BHK Signature preamplifier Measurements |

Thanks Serhan – I’m not sure how to interpret that.

He mentions output volume clips – but is he saying that an input volume of 29V balanced will cause clipping at the output with 100kohm load, or that the measured output volume is 29V when clipping occurs, but the input volume is unknown?

Hi @vee
He usually responds to questions. It might be worth asking him.

1 Like

He’s also still active on Audio Asylum in the Critics Corner section along with other reviewers

1 Like

Why is this spec of interest? It is not something I have ever looked for.

That’s a tough one because of the input attenuator. You can input a LOT of voltage without bothering anything because the attenuator is before the vacuum tube. So, input something silly like 5 volts and it’s not a problem because there’s no input circuitry to upset.

1 Like

I’ve read that some equipment can output up to 10v via RCA, so I was curious as I’ve only read most to output 4v. It seemed outlandishly high and got me thinking about the BHK Preamp’s limits.


10V would be incredibly high for a source to send to a preamp.

What have you seen which outputs 10V?

1 Like

The Mola Mola Tambaqui outputs 6v (which the BHK handles just fine) at its maximum setting… anything higher than that would be unusual.

1 Like