You may have FINALLY helped me understand both the spectrum analyzer and virtual tube amp features in my audio resoration software!!!! I'm self-taught, though never could grasp some concepts without explanation. I knew the tube amp feature is great for "warming" digital recordings, and the analyzer's colours (yeah, Canadian...) show precisely what could counteract unwanted noise. Timing is perfect, since I found a long-missing box of 78s last week, WOOHOO!!!! Thank you
Hi, I have just picked up a HP 3588a spectrum anyliser from work in good working order. I used it to set up antennas for the rail industry using the smith chart to tune the antenna. I have forgotten how to use it as it has been many years since it used it. I don't even know how to open the smith chart display. I look forward to your videos as my love of electronics is in the audio range. I build amplifiers at home of both tube and transistor, guitar and hifi. Thanks for your time in making these videos. I am in the UK so I won't be able to drop by on a Sunday to experience your audio set ups.
Thank you sooo much. I am a PhD civil engineer . I am studying Fouirier Transform for Operational Modal Analysis. Although I have a little knowledge on this topic, after your videos I feel myself in a good level. With my sincerely.
This was just awesome! I honestly learned way more in this video than I was expecting! Really enjoy your videos and really appreciate your taking the time to make them.
nice job ..blueglow..love the videos...and nice car in the barn...im building a custom set of tube amps today...thanks to you...to cold to work on my 65 mustang .so found a set of 60 watt 6600 ohm Hammond transformers in my shop...using dynco power trans .sds cap board and the 6sn7 driver board from tubes4hifi..doing a wood base and slide in top alu plate.will try to do a video tonight..calling it glass and grain..built many mark 3 amps and love the power ..this amp will have only tubes and no high voltage boards on top showing...anyway thank you for getting me back in build..its been like 2 years ...time to blow the dust off my scope...have a great day....
Thank you very informative. Do you ever connect a microphone directly to the spectrum analyzer to check out the output sounds? If so how do you connect to bnc and do you use a preamp?
Digital clipping is the worst, I'm into mixing and mastering, and some people think that 0dbfs+ is the goal to get. It's digital distortion, which sound awful, nowadays, we have to normalize to -6LUFS. And thank God, some mastering engineers saw the light. Digital distortion, is bad for your gear, is bad for your ears, like these days everybody walks around with some earpieces. That's even worse. Great video.
Very nice informative video. Thanks. Several questions. What instrument do you use to measure thd? I've been collecting plug-ins for my old HP141T Spectrum Analyzer. I have a very nice like new audio HP8556b 0-300 Khz plugin for it. With its manual analog controls can it be used for audio work without too much pain? I see you have some kind of BK precision function generator. What is the model number? Have you ever measured its Thd? Can a signal generator have distortion? Thanks again.
I have recently fixed one of these, don't forget the epic transfer function setting so you can see the frequency response of a circuit. It can also measure phase across frequency.
Well done 👍. Beautiful vintage gear. Question: I have a Class D amp with a 370kHz 2Vpp sinewave riding on top of my 1kHz 4Vpp output. Input is clean 20mVpp sinewave. On the scope, the visual effect is a very FAT 1kHz trace. This is a QSC K8 active speaker with magical DSP input. The service manual says the psu runs "around" 400kHz. I do not have a known good K8 with which to compare outputs. Could that 2Vpp be some type of signal processing effect?? Thoughts?
Cheers, keep em coming. I struggle with impedance, for instance calculating the Z of different stages of a valve amplifier. Another subject that taxes the brain cells is feedback both local and global. If you could help with these it would be much appreciated.
Great! I have an entry level DSO and many programs FFT. So, I tried to measure the THD of the I/O of my sound cards, but I ve acquired different values... I tried with various cables and with resistors also. What model of hardware FFT analyzer (or function on DSO) not too expensive do you recommend me and if I measure with software, what config cables ? Thank you
Extending an open invitation on the internet to come listen to your gear, might have some unintended consequences.... :) Just make sure to keep enough beer cold....
Enjoyed the video but the comment at 14.38 seems to be wrong. A square wave consists of a sign wave of a certain frequency plus an infinite number of it's odd harmonics right? Its not an infinite number of sign waves, that would just be a complex wave form. I did fourier transformation at college many years ago, I hated the math behind it, drove me crazy.
Is the smoother clipping of valve / tube circuits compared with transistors due to slower response times of the valve/ tube compared with solid state devices ?
hi blueglow wonder if you could help ......do you think changing from a 11.3 ohm to a 10.ohm chathode resistor has a change in the tone or output running the same plate current....dynco ran the 11.3.....elpasso changes to a ten .some use a 1 ohm....
It wont affect the sound one bit. to keep the same voltage drop across the cathode bias resistor, you'll need to adjust the bias pot slightly. and then the markings on the front of your amp will be off a tad. in the grand scheme, its all about the same
thank you ...don't now why they just didn't use a 10,ohm..just finished the wood base..and top 1\8 inch alu plate .now doing the layout....boards all built....love this new 6sn7 mod board...
I enjoyed the video until you said clipping could be due to bias adjustment... bias adjustment is important for crossover distortion and to keep the amp cool when idle. it does not affect clipping.
Really exceptional description of the use of an audio SA. Glad you overran there!
Amazing teaching and super simplicity
One of the best explanation! Great work, thank you 🙏
You may have FINALLY helped me understand both the spectrum analyzer and virtual tube amp features in my audio resoration software!!!! I'm self-taught, though never could grasp some concepts without explanation. I knew the tube amp feature is great for "warming" digital recordings, and the analyzer's colours (yeah, Canadian...) show precisely what could counteract unwanted noise. Timing is perfect, since I found a long-missing box of 78s last week, WOOHOO!!!!
Thank you
Hi, I have just picked up a HP 3588a spectrum anyliser from work in good working order. I used it to set up antennas for the rail industry using the smith chart to tune the antenna. I have forgotten how to use it as it has been many years since it used it. I don't even know how to open the smith chart display. I look forward to your videos as my love of electronics is in the audio range. I build amplifiers at home of both tube and transistor, guitar and hifi. Thanks for your time in making these videos. I am in the UK so I won't be able to drop by on a Sunday to experience your audio set ups.
This is a fantastic video on the subject. Nice work! Like the tshirt btw.
Thank you sooo much. I am a PhD civil engineer . I am studying Fouirier Transform for Operational Modal Analysis. Although I have a little knowledge on this topic, after your videos I feel myself in a good level. With my sincerely.
Great lecture. Appreciate.Thank you very much .
This was just awesome! I honestly learned way more in this video than I was expecting! Really enjoy your videos and really appreciate your taking the time to make them.
Thanks so much, very informative.
Very nice! A full tutorial, I use almost all buttons and controls in mine though lol. Then again I build amps and RF stuff.
nice job ..blueglow..love the videos...and nice car in the barn...im building a custom set of tube amps today...thanks to you...to cold to work on my 65 mustang .so found a set of 60 watt 6600 ohm Hammond transformers in my shop...using dynco power trans .sds cap board and the 6sn7 driver board from tubes4hifi..doing a wood base and slide in top alu plate.will try to do a video tonight..calling it glass and grain..built many mark 3 amps and love the power ..this amp will have only tubes and no high voltage boards on top showing...anyway thank you for getting me back in build..its been like 2 years ...time to blow the dust off my scope...have a great day....
very cool
This is very educational vedio .this will me to understand what is a warm sound in frequency dispay.FFt is realy a magic in math and engineering.
Thanks for such Informative Video!!
Excellent Sir ! Many questions I had were answered. Thank you very much for the time you give to create these videos.
thanks for the time it took you to assemble and explain all this in an understandable way, fantastic job much appreciated sir!
Excellent presentation. Very informative and helpful. Thank you.
Thank you very informative. Do you ever connect a microphone directly to the spectrum analyzer to check out the output sounds? If so how do you connect to bnc and do you use a preamp?
Your always good Billy-Bob
Digital clipping is the worst, I'm into mixing and mastering, and some people think that 0dbfs+ is the goal to get. It's digital distortion, which sound awful, nowadays, we have to normalize to -6LUFS. And thank God, some mastering engineers saw the light. Digital distortion, is bad for your gear, is bad for your ears, like these days everybody walks around with some earpieces. That's even worse. Great video.
Very nice video and informative, thanks a lot.
Very nice informative video. Thanks. Several questions. What instrument do you use to measure thd? I've been collecting plug-ins for my old HP141T Spectrum Analyzer. I have a very nice like new audio HP8556b 0-300 Khz plugin for it. With its manual analog controls can it be used for audio work without too much pain? I see you have some kind of BK precision function generator. What is the model number? Have you ever measured its Thd? Can a signal generator have distortion? Thanks again.
Yet another amazing video!. Thank you.
Nice Video ! ....... I have an HP 3582A !, it is a brilliant machine !
I have recently fixed one of these, don't forget the epic transfer function setting so you can see the frequency response of a circuit. It can also measure phase across frequency.
Well done 👍. Beautiful vintage gear. Question: I have a Class D amp with a 370kHz 2Vpp sinewave riding on top of my 1kHz 4Vpp output. Input is clean 20mVpp sinewave. On the scope, the visual effect is a very FAT 1kHz trace. This is a QSC K8 active speaker with magical DSP input. The service manual says the psu runs "around" 400kHz. I do not have a known good K8 with which to compare outputs. Could that 2Vpp be some type of signal processing effect?? Thoughts?
Great video. Keep them coming !
Thanks for giving a great knowledge sir
Cheers, keep em coming. I struggle with impedance, for instance calculating the Z of different stages of a valve amplifier. Another subject that taxes the brain cells is feedback both local and global. If you could help with these it would be much appreciated.
Great stuff!
Nice video! Thanks
Very Nice Video .... Thank you
Great! I have an entry level DSO and many programs FFT. So, I tried to measure the THD of the I/O of my sound cards, but I ve acquired different values... I tried with various cables and with resistors also. What model of hardware FFT analyzer (or function on DSO) not too expensive do you recommend me and if I measure with software, what config cables ? Thank you
Great video.
Extending an open invitation on the internet to come listen to your gear, might have some unintended consequences.... :) Just make sure to keep enough beer cold....
Enjoyed the video but the comment at 14.38 seems to be wrong. A square wave consists of a sign wave of a certain frequency plus an infinite number of it's odd harmonics right? Its not an infinite number of sign waves, that would just be a complex wave form. I did fourier transformation at college many years ago, I hated the math behind it, drove me crazy.
i noticed my cheap USB osilloscope has FFT function. will try to measure some audio signal with it. thanks.
Excellent.
Wow this was 👍 Thxsomuch🎇
Is the smoother clipping of valve / tube circuits compared with transistors due to slower response times of the valve/ tube compared with solid state devices ?
great vid
I thought I spied a 69 Camaro in there! Nice!
Is it like having many, many Oscopes running at once?
hi blueglow wonder if you could help ......do you think changing from a 11.3 ohm to a 10.ohm chathode resistor has a change in the tone or output running the same plate current....dynco ran the 11.3.....elpasso changes to a ten .some use a 1 ohm....
It wont affect the sound one bit. to keep the same voltage drop across the cathode bias resistor, you'll need to adjust the bias pot slightly. and then the markings on the front of your amp will be off a tad. in the grand scheme, its all about the same
thank you ...don't now why they just didn't use a 10,ohm..just finished the wood base..and top 1\8 inch alu plate .now doing the layout....boards all built....love this new 6sn7 mod board...
I enjoyed the video until you said clipping could be due to bias adjustment... bias adjustment is important for crossover distortion and to keep the amp cool when idle. it does not affect clipping.
0:41...enjoy it-!!
Kinda hard to finish but I get if you need 101
Sir please stick to instructions don't care about all the extra fluff just need to use the spec An
hay
Excellent presentation, Very informative and helpful, Thank you.
Nice Video. Thanks.