Tubes

[truthfollower]

Did you try ferrite chokes or snap on first? on each of the lines, just put a few every 10 cm; you will see this issue disappear; another way i do it; get a ferrite choke put the wire in ; circle it in a few turns.

should i share QLN of my line?
will you able to identify source of noise? there are some spikes at some tones

 

[truthfollower]

View attachment 659104 View attachment 659102 View attachment 659103

I have given examples above.

is this one ferrite chokes? what kind of specifications to look for one buying it?

 

[denel]

View attachment 659541
is this one ferrite chokes? what kind of specifications to look for one buying it?

There is no spec; just go to aliexpress or any other online; just look for ferrite choke or snap ons; just install a couple on any lines e.g. 10cm apart it will resolve this issue.

 

[ps3linux]

If there are any folks who are audiophiles - using vaccum tubes. there is a shortage of supply starting - try to get a few stocked up. not sure when the chinese factory will be back in production.

Tubes are good but due to frequent replacement and sourcing problems, gave them up and as mentioned in another thread.

I have recently completed acquisition of 1,500 vinyls today which will add to my collection of existing 300, want to improve the sound quality of my Garrard 401.

So fiddling with a headphone amp design and the capabilities I want in it, Bluetooth/wireless/wired and selection of OP AMPs LME49720HA / OPA627/ HDAM99999SQ / V5iD / MUSE03/04 after that few days with EAGLE and then on to PCB fabrication.

I have all of the mentioned OP-AMP personally I liked LME49720HA and OPA627 combined with a BUF634 or AD815 it becomes awesome.

 

[denel]

Tubes are good but due to frequent replacement and sourcing problems, gave them up and as mentioned in another thread.

I have recently completed acquisition of 1,500 vinyls today which will add to my collection of existing 300, want to improve the sound quality of my Garrard 401.

So fiddling with a headphone amp design and the capabilities I want in it, Bluetooth/wireless/wired and selection of OP AMPs LME49720HA / OPA627/ HDAM99999SQ / V5iD / MUSE03/04 after that few days with EAGLE and then on to PCB fabrication.

I have all of the mentioned OP-AMP personally I liked LME49720HA and OPA627 combined with a BUF634 or AD815 it becomes awesome.

The issue is chinese tubes are not good. If you get the soviet stock; far better quality and lasts 5x as long.

 

[ps3linux]

The issue is chinese tubes are not good. If you get the soviet stock; far better quality and lasts 5x as long.

Sourcing my friend, that's why I gave up tubes and moved to solid state totally. I mean with the exception of few here and there bits solid state particularly the high end sh*t amp I mentioned never disappointed me.

 

[truthfollower]

There is no spec; just go to aliexpress or any other online; just look for ferrite choke or snap ons; just install a couple on any lines e.g. 10cm apart it will resolve this issue.

thank you so much and sorry for replying late i was banned.I bought some snap ons and I think noise is from some electric equipment because during load shedding (power off ) in the area i don't get noise on those tunes or bands.

 

[denel]

thank you so much and sorry for replying late i was banned.I bought some snap ons and I think noise is from some electric equipment because during load shedding (power off ) in the area i don't get noise on those tunes or bands.

Great - you did put the snapons?

They work really well. I have my entire equipment shielded; for example - 1.2 Kw transmission amplifier for hf or 500w for vhf/uhf. If I dont ground my equipment, multi-filters to suppress harmonics; it will show up all over the house and neighbouring property over 2km away.

Lol - my aunt will call me - you on radio now!. Then I know problem.

 

[truthfollower]

you did put the snapons?

yes

 

[truthfollower]

@denel
Hello,
I have one more question for you. Why sound quality is so bad in radio? Sorry, I dont know the correct word. Is it becuase of low bit rate or bit depth?

 

[denel]

@denel
Hello,
I have one more question for you. Why sound quality is so bad in radio? Sorry, I dont know the correct word. Is it becuase of low bit rate or bit depth?

I do not follow? Are u listening to radio or music? If radio, what is your receiver - dual conversion? DSP etc.

If music, sorry, am not into that side of sampling etc.

 

[truthfollower]

I do not follow? Are u listening to radio or music? If radio, what is your receiver - dual conversion? DSP etc.

I meant to say radio used by military for communications. I don't know the correct term. They use 16 bit, 8 bit or 4 bit audio for communication.

 

[denel]

I meant to say radio used by military for communications. I don't know the correct term. They use 16 bit, 8 bit or 4 bit audio for communication.

specifically what are you trying to listen to? CW, AM, SSB, FM or digital traffic?
You may be using RT-SDR may be which is why this question?
They do not use any bits unless there is a digital protocol - if so, you may be unable to listen to that as it may be already encrypted.

 

[truthfollower]

specifically what are you trying to listen to? CW, AM, SSB, FM or digital traffic?
You may be using RT-SDR may be which is why this question?

my question came from this video
at 4:00
24bit 16 bit 8 bit 4 bit
why military radio communication sounds like 4 bit audio?

 

[denel]

my question came from this video
at 4:00
24bit 16 bit 8 bit 4 bit
why military radio communication sounds like 4 bit audio?

Nope. completely wrong. he is just using different bits for decoding. You need to track back and understand modes of communications first.

Use below as a reference:

List of amateur radio modes - Wikipedia

en.wikipedia.org

To start with you need to first get a communication receiver; you can use rTL-SDR as well. Forget mil comms - that youtube video is rubbish. we use quiet mode you will never even see them.

For transmission, you need to get a licence.