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-   -   VFET amp Bourns trimmer exchange (https://www.diyaudio.com/forums/pass-labs/373208-vfet-amp-bourns-trimmer-exchange.html)

MEPER 9th June 2021 11:25 PM

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.

PKI 10th June 2021 12:20 AM

Quote:

Originally Posted by Zen Mod (https://www.diyaudio.com/forums/pass-labs/373208-vfet-amp-bourns-trimmer-exchange-post6686014.html#post6686014)
:cheers:

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

:clown:


Or just disconnect it :)

MEPER 10th June 2021 07:01 AM

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......

MEPER 10th June 2021 09:34 PM

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).

TungstenAudio 10th June 2021 09:40 PM

:cheers:

Zen Mod 10th June 2021 09:46 PM

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

oreo382 10th June 2021 09:53 PM

Eeznoogood! I just learned a new word,thank you :)

chede 10th June 2021 10:10 PM

1 Attachment(s)
https://www.diyaudio.com/forums/atta...1&d=1623359401

oreo382 10th June 2021 10:18 PM

Wa'at Alahf

Zen Mod 10th June 2021 10:25 PM

yup

Chede just show that word is not new :)

it just depends how you write it

Kalif instead of Kalif

:rofl:


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