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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 17 Oct 2019, 11:52

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PostPosted: 25 Sep 2019, 21:23 

Joined: 25 Sep 2019, 20:48
Posts: 1
Hi everyone, this is my first post. I've got one of these tweeters wired into the front right speaker outputs on an old amp from Goodwill. The amp works fine when plugged into normal speakers, but when there's only a tweeter wired into the amp's right-speaker output, and I play a 1.5 kHz tone at about half volume, after a bit, the tweeter pops, smokes, and fades out.

The setup is:
* a laptop audio out going to the amp's CD inputs
* the laptop plays a 1.5 kHz sine wave
* amp volume dial is about 1/2. The left/right and forward/rear knobs are on the middle.
* the tweeter is impedance matched with the amp (8 Ohms)
* there's not a crossover in front of the tweeter

In trying to characterize the power that the amp is sending to the tweeter, the results were confusing. With a multimeter (or a scope) on the amp-tweeter leg of the circuit, in series it was seeing milliamps, and in parallel, it was seeing millivolts. Since the tweeter is popping and blowing, and the tweeter has a 300W rating, it would seem that the meter should be picking up way more than milliwatts. (This was with the volume knob on the amp maybe a quarter of the way to max volume).

Any ideas for measurements I can try, or any obvious thing I've missed here in the setup?

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