HiFi voltage etc..

[leedude]

what are the common voltages(rms and peak) used in the following cases.

hifi equipment(like CD player) phono outputs
guitar pickup output
amp to speaker(say an 8 ohm imp.)

also, what is the highest voltage you can put into the input of a guitar amp without blowing up transistors.(specifically the marshall mg30dfx)

also, is there a place i can get some kind of subminiature valve(vacuum tube) which has a super low anode voltage like 24V. I saw these russian ones on the internet, but cant find anywhere to buy them.

 

[audioguru2]

what are the common voltages(rms and peak) used in the following cases.

hifi equipment(like CD player) phono outputs

A CD player has an output of about 200mV RMS/283mV peak when it is playing very loud.

guitar pickup output

If a guitar pickup is loaded with 1M ohms and is played very loud then its output will be about 1V RMS/1.4V peak.

amp to speaker(say an 8 ohm imp.

Calculate it. 1W into 8 ohms is 2.8V RMS/4V peak. 10W into 8 ohms is 9V RMS/12.7V peak. 100W into 8 ohms is 28V RMS/39.6V peak. 1kW into 8 ohms is 90V RMS/127V peak.

also, what is the highest voltage you can put into the input of a guitar amp without blowing up transistors.(specifically the marshall mg30dfx)

Dunno, maybe a few volts.

 

[leedude]

thanks loads, really needed that.

Quote
amp to speaker(say an 8 ohm imp.
Calculate it. 1W into 8 ohms is 2.8V RMS/4V peak. 10W into 8 ohms is 9V RMS/12.7V peak. 100W into 8 ohms is 28V RMS/39.6V peak. 1kW into 8 ohms is 90V RMS/127V peak.

should have worked that out myself.