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In Reply to: RE: Test equipment for SET DIY posted by iodemus on March 13, 2017 at 15:32:30
You will need a function generator that does square and sine waves, and a scope with a probe, or two, if its dual trace. A used Tektronix solid state scope is what I'd opt for. Maybe there is on-line apps to do the function generation.
Why don't you take the amp to a nearby audio repair facility, or a nearby university, with an EE department, and have THEM look over and measure your amp? A professor would like to do that. For as little as you will use the test equipment, it is not really necessary to buy .
What you are suggesting was probably possible 50 years ago, but not today. Digital, bits, bytes, pixels etc. rules today. We are a small extincting group.
When developing a tube amp I need the measuring equipment at hand any time to have control with the circuit alterations I do.
To rely on ones ears is ok to evaluate the end result, but during the construction process it is very helpful, almost necessary; to see what happen to the signal when alterations are done. Is a two trace scope which can compare the input signal with the output signal what I should look for? What are others using? Kits and tested schematics? Sometimes I feel I should have done the same, but I like the challenges.
I use a Hitachi dual trace 60MHZ scope ($40) + Kenwood AG203 sine/square wave generator ($60), both acquired through eBay. Just make sure you research the feedback history of sellers.
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