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VFET amp Bourns trimmer exchange
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Old 9th June 2021, 10:25 PM   #21
MEPER is offline MEPER  Denmark
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A lot of noise ends up in the tweeters.......also the low frequent from rectifiers etc....which have some "nasty" overtones that is very audible in the tweeter.

I will think about the 8 ohm :-) ......but I also want to hear the "pling" sounds from guitar strings etc....

The ACA's are back on the shelf now but they did a very good job.
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Old 9th June 2021, 11:20 PM   #22
PKI is offline PKI  United States
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VFET amp Bourns trimmer exchange
Quote:
Originally Posted by Zen Mod View Post


you can always put 8R in series with tweeters....... noise gone!


Or just disconnect it
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Old 10th June 2021, 06:01 AM   #23
MEPER is offline MEPER  Denmark
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It can also be a dangerous exercise to put ear only few cm from dome if a bad spike suddenly got into the system.....it may cause permanent ear-damage :-)
Those having +105 dB horn tweeters.....it may be even more dangerous.....

Have you checked your hearing at high frequencies using test-CD or generator?
I can hear 12 kHz but 16kHz seems to be almost gone.....
Maybe tweeters are "overrated" for middage or above people......
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Old 10th June 2021, 08:34 PM   #24
MEPER is offline MEPER  Denmark
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Amp is now fully assembled with top cover on and both channel showed 20.08 VDC at the test point after warm-up.
Will conclude that problem has been solved. Also tonight both channels was very quiet (and equal).
After experiment with passive pre I amp back using active (it always ends up that way even that first listening impression is very good using passive pre but after a while.....something is missing).
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Old 10th June 2021, 08:40 PM   #25
TungstenAudio is online now TungstenAudio  United States
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Old 10th June 2021, 08:46 PM   #26
Zen Mod is offline Zen Mod  Serbia
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VFET amp Bourns trimmer exchange
passive pre is important reference

good quality preamp must have same amount of details, but also bringing improved dynamics

if both of these aren't there, preamp eeznoogood
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Old 10th June 2021, 08:53 PM   #27
oreo382 is offline oreo382  Canada
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Eeznoogood! I just learned a new word,thank you
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Old 10th June 2021, 09:10 PM   #28
chede is offline chede  Germany
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Old 10th June 2021, 09:18 PM   #29
oreo382 is offline oreo382  Canada
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Wa'at Alahf
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Old 10th June 2021, 09:25 PM   #30
Zen Mod is offline Zen Mod  Serbia
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VFET amp Bourns trimmer exchange
yup

Chede just show that word is not new

it just depends how you write it

Kalif instead of Kalif

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