Quick tube question

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baky

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I have just a quick question. I have diesel Einstein 100W and I want to put KT88 tubes in it. My friend that does biasing and stuff for me told me that I need only Two KT88 because they can easily deliver 100watts.
Is that ok or I have to buy a quartet ?

Thanks
 
4 tubes slots = 4 tubes IMO.

Not sure why you would want to do this when you have a Master Volume. Of course you can choose to run only 2 tubes and will get less power. Not equal to 1/2 necessarily, however it will drop the wattage.

Many have tried this, including me (never on a Diezel though). The question is, "will it sound the same as if you had all 4 tubes in". The answer is generally, no. So, that's why I would agree with Joni here, buy 4.

You can always pull 2 after you rebias and try the options. If you only buy 2 you will not be abl to try both ways and won't know the differences or whether you would prefer all 4 in.

You might ask Peter if there are any negative repercussions to trying this with your amp before you take ANYONE else's word for it.

Happy experimenting...
 
baky":3l5ue268 said:
I have just a quick question. I have diesel Einstein 100W and I want to put KT88 tubes in it. My friend that does biasing and stuff for me told me that I need only Two KT88 because they can easily deliver 100watts.
Is that ok or I have to buy a quartet ?

Thanks
Click to expand...

While a pair of KT88s CAN deliver 100 watts, they won't in most guitar amps. They take a different design to do that...usually a "dual rail" design where the B+ is at about 700V while the screen rail is at about 350V (like what you'd find in an Ampeg SVT). In a typical single rail guitar amp design, they will put out close to what anything else would put out in the same amp.

Maximum power output isn't primarily governed by the valves. Power output is determined by how much power can be supplied and the load impedance. Plate curves come into the equation as well, but not in the way that most think they do. Valves don't "make power". They simply meter power supply current to the output transformer based on input signal amplitude.
 
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