|Author:||automap68 (registered user: 127 posts )|
|Date:||Fri, Feb 10th, 2012 @ 12:25 ( . )|
On 02/10/2012 @ 11:20, Surfsup wrote :
Please don't take offense as I am not an expert, but what is your question, exactly? I don't even know at this point. It would help if you restate it perhaps?
: Comment: I don't know how you can measure a tube amp power output to 5 decimal places accurately. The power tube plate resistances change with the amplitude of the signal, and the speaker resistances change with the frequency of the signal. So the power output would change. So I guess I have a question, how does your specialized measuring equipment actually work, to produce an accurate result to 5 decimal places? Who makes the device and what is its model number? I would like to look it up online since it seems like a company builds these things.
I apologize for my remarks above but this is a frustrating scenario
I have 5 weeks into building this thing and lots of money and i have a minor issue and it doesn't seem that people want to help. I have been waiting for a reply for two weeks on what i consider a minimal issue. Considering the works.
yet every day there are a million other posts going on.
No one is obligated to reply im just disapointed. I expected the ax84 community would of been more eager to trouble shoot the issue. As this is sometimes half the fun
The analyzer is an old HP box
It interprets the signal from the signal from the signal analyzer, screens it, runs it through an integration algorithm and compares it with the average power rateing for each part of the signal.
It can be set up to do this over a set number of cycles. Or take an infinite loop of readings
It is actually pretty awesome.
Like i said im in a lab. I have these toys tom play with that most people have never seen so it does not surprise me that people don't understand how im getting my endearments.
It is nothing more then first grade calculus.
I do understand as i said that most people dont have these tools at there disposal so for me to report certain numbers with out the standard way of testing may seem odd
Just for kicks i did it the old fashioned way as suggested above and same deal. 4 watts
Which to restate the issue.
The amp works as expected. Suggest output power is way below spec
On known good tubes
So either there is an issue or..... other people reporting wattages are full of crap
As ive said before there is no way a kt88 SE will make more then 10 MAYBE 12 watts
that means im missing more then half of my power.
That is the issue
Im not meaning to sound like a jerk but its frustrating
I deal with these sort of things all day but i know very little about tubes
Im a digital guy which is EXACTLY why i started this project so i could learn some more about it however even with my extensive knowledge im limited on problem solving techniques on analog circuitry.
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