What Oscilloscope specs for audio work, diagnosis and repair?
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From: K Fodder on 3 Apr 2010 09:24 Hi can someone please help me with what scope I should get for Audio equipment repair? I need to have flexibility so I wont have to buy another for a while. A benchtop model is fine. I want something specifically to cover tube/valve amps. I need to be able to check the performance of amp and see if my input signal is distorting, deteriorating, has interference or other types of problems that plague audio. What the max MHZ range would I need to aim for? What other features would it need or be handy? Do you know a specific brand and model? Do you think I need any other equipment? Whats a good brand/model function generator? Lastly I have read suggestions that I should get an older analog scope for this work. And then read the digital ones "can" do the job. It is a bit of conflicting information what do you think? What would be best for audio and offer the most flexibility? Or has there been a scope that covers both digital and analog well? Detailed answers are fine. Learning... :)
From: bob urz on 3 Apr 2010 10:37 K Fodder wrote: > Hi can someone please help me with what scope I should get for > Audio equipment repair? I need to have flexibility so I wont > have to buy another for a while. A benchtop model is fine. > > I want something specifically to cover tube/valve amps. > I need to be able to check the performance of amp and see if > my input signal is distorting, deteriorating, has interference > or other types of problems that plague audio. > > What the max MHZ range would I need to aim for? > What other features would it need or be handy? > Do you know a specific brand and model? > Do you think I need any other equipment? > Whats a good brand/model function generator? > > Lastly I have read suggestions that I should get an older analog > scope for this work. And then read the digital ones "can" do the job. > It is a bit of conflicting information what do you think? > > What would be best for audio and offer the most flexibility? > Or has there been a scope that covers both digital and analog well? > > Detailed answers are fine. Learning... :) > I would recommend getting a dual trace scope. Minimum 20/30MHZ bandwidth. You should be able to get a used one reasonable. ($50 to $200 dollars) I like Tektronix, but a older BK, Hitachi, Kikutsi or such would be fine. There are some newer imports that MCM electronics carrys. Since audio only goes up to 20Kilo Hz or so, you really don't need a lot of input bandwidth. But for looking at transients and other things it can be helpful. I have little plastic boxed function sweep generators. You can also get CD's with audio tones and sweeps on them. For quick and dirty, download the CD to a small MP3 player and thats about as small as it gets. If your trying to do THD tests or such thats another ball game to get a low THD sine source. Depends on what your doing... bob
From: N_Cook on 3 Apr 2010 10:44 K Fodder <abc(a)123.com> wrote in message news:4bb741a5$0$7727$c3e8da3(a)news.astraweb.com... > Hi can someone please help me with what scope I should get for > Audio equipment repair? I need to have flexibility so I wont > have to buy another for a while. A benchtop model is fine. > > I want something specifically to cover tube/valve amps. > I need to be able to check the performance of amp and see if > my input signal is distorting, deteriorating, has interference > or other types of problems that plague audio. > > What the max MHZ range would I need to aim for? > What other features would it need or be handy? > Do you know a specific brand and model? > Do you think I need any other equipment? > Whats a good brand/model function generator? > > Lastly I have read suggestions that I should get an older analog > scope for this work. And then read the digital ones "can" do the job. > It is a bit of conflicting information what do you think? > > What would be best for audio and offer the most flexibility? > Or has there been a scope that covers both digital and analog well? > > Detailed answers are fine. Learning... :) > You should also get a potential divider for when working on the o/p area as you are bound to have the attenuator set on the wrong scale ,some time, and at least blow the first transistor. By the same reasoning an old 10 or 20 MHz scope with repair manual and usually no custom items in there, and make sure it easy to take apart for repairing it, plus perhaps a dead one of same model for spares. Get one that you remove one cover and almost everything is accessible. At least 10 or 20 M b/w usually means not a load of difficult to remove can screening involved. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://diverse.4mg.com/index.htm
From: Phil Allison on 3 Apr 2010 10:55 "Kannon Fodder" > Hi can someone please help me with what scope I should get for > Audio equipment repair? I need to have flexibility so I wont > have to buy another for a while. A benchtop model is fine. > > I want something specifically to cover tube/valve amps. > I need to be able to check the performance of amp and see if > my input signal is distorting, deteriorating, has interference > or other types of problems that plague audio. > > What the max MHZ range would I need to aim for? > What other features would it need or be handy? > Do you know a specific brand and model? > Do you think I need any other equipment? > Whats a good brand/model function generator? > > Lastly I have read suggestions that I should get an older analog > scope for this work. And then read the digital ones "can" do the job. > It is a bit of conflicting information what do you think? ** DO NOT BUY A DIGITAL SCOPE !!!!!!!!!!!!! Almost any ANALOGUE scope with bandwidth of 5 MHz or more is OK - DC coupled or not. Digital scopes absolutely SUCK for audio work. ...... Phil
From: K Fodder on 3 Apr 2010 11:20
>You should also get a potential divider for when working on the o/p area as >you are bound to have the attenuator set on the wrong scale ,some time, and >at least blow the first transistor. You mean like a varible resistive dummy load for the output? |