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In Reply to: RE: Which tube position has most influence on sound,12AU7, 12AX7, or KT88? posted by SETdude on November 11, 2015 at 17:57:35
What kind of amp are you talking push pull or single ended? In single ended the power tube being the last link in the chain has a great effect. That is not to say that the driver or signal tube has a significant effect. But if you have an amp where you can switch power tubes you will hear the greatest sonic difference with the power tubes. In my single ended pentode amp that allows me to use 6l6, kt66, el37, 6550, el34, etc. It is very obvious that the different power tubes have a greater sonic effect than the driver tube. This amp can also switch the 6sl7 or 6sn7 driver tubes and changing all the different input brands of input tubes has a lesser sonic impact than the power tubes. cheers, Dak
Follow Ups:
I use a SEP amp too than runs pairs of 6V6-KT150's. With a given power tube the driver/ rectifier pairing has the biggest impact.
My amp is a Cayin CS-55A (AB1 PP). 12AU7s and 12AX7s for preamp, KT88 for power.
I think you guys have confused me even more..:D
So for those that says the premp tubes, why is that? Because it's where the "sound processing" happens? Isn't it just sort of a "volume controller" or "power/gain resistor"?
"So for those that says the premp tubes, why is that?"
Think about it logically: any corruption of the signal at the input to the amplifier will be amplified throughout the device by each subsequent stage.
The pre amp tubes are less expensive to 'roll' and different combinations there often dials the sound in. Which KT88's are you using?
Still the stock power tubes--Shuguangs I believe, though its branded Cayin. I like the sound right now very much, but I'd like to hear another sound--a more tubey kind of sound.
on your equipment. Some designers will make their equipment more or less tube sensitive. I am not sure how that is done but probably has to do with SS devices as regulators and current sources. Anyways, as you can read, people's experiences vary so you can only experiment with your own equipment and use this as an excuse to buy more tubes! While I am sure the tube dealers don't express this sentiment, but in my book the best sounding/lasting tubes were made before the 70's. cheers, Dak
Do a search here for warm 12AX/AU7's. Mullard is the standard answer but quality samples are getting hard to find. Since you rather are new to tubes I suggest buying from a reputable source and avoid epay unless you really are sure of what you are getting.
All that said, the new production JJ ECC803S is on the warm side of neutral and won't break the bank.
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