Purchase via EBAY a Distortion measurement set HP 339A from an supplier from Israel. This morning it arrived an I did some quick tests. It is a good functional set and I am now very happy with it to test the THD of my tube amp designes. Oh yes, the Forum will shout to me " but there are very good software tools to do that job" and, yes, I agree. But anyway I am glad to have a set that will do that job also.
Here a picture of my set:
Here a picture of my set:
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They are sure easy to use, last of its kind.Nice. They're fast and easy to use.