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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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What signal generator for audio work?
Can someone please recommend a signal gen for audio work?
I want to get into solid state and tube/valve amp repair. Feel free to suggest a brands/models etc. What other gear is handy to have? I have a scope and a DC PSU. Any good resources on the web? Books etc I should be reading? Thanks CT |
#2
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What signal generator for audio work?
"Chris Tansit" wrote in message
... Can someone please recommend a signal gen for audio work? I want to get into solid state and tube/valve amp repair. Feel free to suggest a brands/models etc. What other gear is handy to have? I have a scope and a DC PSU. Any good resources on the web? Books etc I should be reading? Thanks CT For general work I think any decent sine-square generator in good working order would do. Use sine waves for a general troubleshooting signal source, use square waves, usually around 1 kHz as a good overall (quick) check for linearity. One thing I've noticed for example, a square wave signal viewed on a 'scope will quickly tell you if a loudness or filter switch is malfunctioning. One channel may remain boosted or attenuated when the control is back in the "neutral" position. Also, square waves seem to show more easily the effects of dirty controls, relays, etc as you are manipulating or tapping on them (when viewed on a 'scope of course). I use a Leader solid state model at work (don't remember the model) but for many years used an Eico 377 tube model. They can be found all over eBay for under 50.00. A new solid state model will run 179.00 and up. I think most distortion analyzers sine wave generators built in - my Sound Technology 1700B does. They can be had used for maybe around 400.00 or so. Mark Z. |
#3
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What signal generator for audio work?
On 4/17/2010 2:22 AM, Chris Tansit wrote:
Can someone please recommend a signal gen for audio work? I want to get into solid state and tube/valve amp repair. Feel free to suggest a brands/models etc. What other gear is handy to have? I have a scope and a DC PSU. Any good resources on the web? Books etc I should be reading? Thanks CT For general use, I use a Heathkit IG-5218 (also available in a different color as the IG-18, which is a bit older) This unit has stepped frequency selection and an output meter. Really easy to work on if it needs it. Likely available on e-bay or at hamfests for under $50. I've seen filthy ones as low as $10. Of course the build quality of the kit is a factor. There are also lots of mods possible to make them lower distortion, but some of the mods reduce the stability and make the settling time when changing frequencies annoying at best, and damaging at worst. Also, the unit is low enough in distortion for general use as is. If you don't have or need a distortion analyzer, they are pointless. That said, there a lots of good choices. Regards, Tim Schwartz Bristol Electronics P.S. Here's one on e-bay now: 190389304471 |
#4
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What signal generator for audio work?
Chris Tansit wrote in message
... Can someone please recommend a signal gen for audio work? I want to get into solid state and tube/valve amp repair. Feel free to suggest a brands/models etc. What other gear is handy to have? I have a scope and a DC PSU. Any good resources on the web? Books etc I should be reading? Thanks CT A calibrated , well at least consistently marked between ranges , attenuator on the o/p is useful |
#5
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What signal generator for audio work?
I have a heavily modded Heathkit audio generator, which I'd be happy to
sell. I don't remember the model number. About 35 years ago, "Audio Amateur" published an article on modifying this generator for ultra-low distortion. The "catch" is that when you change frequency, you have to wait a second or two for the generator to settle. I'd sell it for the original price of the kit. If you're interested, please get in touch with me. |
#6
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What signal generator for audio work?
Chris Tansit Inscribed thus:
Can someone please recommend a signal gen for audio work? I want to get into solid state and tube/valve amp repair. Feel free to suggest a brands/models etc. What other gear is handy to have? I have a scope and a DC PSU. Any good resources on the web? Books etc I should be reading? Thanks CT Knock up a multivibrator circuit ! Four resistors, three caps, two transistors & 9V battery. -- Best Regards: Baron. |
#7
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What signal generator for audio work?
On 17 Apr 2010 06:22:06 GMT, Chris Tansit wrote:
Can someone please recommend a signal gen for audio work? A computah, of course. Get a 96KHz 24 bit sound card and some softwa http://www.sillanumsoft.org/prod01.htm (see sig gen feature) There are plenty of others, including some that I use on my iPod Touch. (I need 2 tones, with very low intermod products, for testing SSB and ACSSB radios). The nice thing about the laptop or iPod Touch approach is that it's portable and can be used in the field. More money but also more versatile are various USB oscilloscope/generator conglomerations. For example: http://www.syscompdesign.com I want to get into solid state and tube/valve amp repair. You're a bit late. Xsistors happened in the late 1960's. Feel free to suggest a brands/models etc. Price limit? Any specification limits? Need anything besides a signal generator (pulse, sweep, white noise, portable, etc)? It's difficult to be specific when your requirements are a bit vague. What other gear is handy to have? Sweep generator, white noise generator, pink noise generator, audio spectrum analyzer, distortion analyzer, power supply, DVM, dummy loads, soldering iron, sanity tester, coffee maker, billing software, etc. I have a scope and a DC PSU. Ok, that's a start. Add a tube caddy to the above list. It really impresses customers over 60 years old. (Yes, I have one). Any good resources on the web? Books etc I should be reading? Dunno. I never RTFM or Google for info until after I get into trouble. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#8
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What signal generator for audio work?
On Apr 16, 11:22*pm, Chris Tansit wrote:
Can someone please recommend a signal gen for audio work? I want to get into solid state and tube/valve amp repair. Feel free to suggest a brands/models etc. What other gear is handy to have? I have a scope and a DC PSU. Any good resources on the web? *Books etc I should be reading? Thanks CT There are battery powered versions. There are dedicated instrument packages. I started using my PC's Sound Card. It was free. Gave me total control of what was produced and produced the lowest distrotion I've ever seen. Then I started using the sound card as a 'scope' and then as a spectrum analyzer. So now I have a two channel input high quality spectrum analyzer with two channel tracking generator outputs! You want to test the quality of your amplifier? Best system for it. |
#9
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What signal generator for audio work?
Robert Macy wrote:
Then I started using the sound card as a 'scope' and then as a spectrum analyzer. So now I have a two channel input high quality spectrum analyzer with two channel tracking generator outputs! Ya wanna give us a hint as to who's software you're using? Jeff -- “Egotism is the anesthetic that dulls the pain of stupidity.” Frank Leahy, Head coach, Notre Dame 1941-1954 http://www.stay-connect.com |
#10
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What signal generator for audio work?
Phil Allison wrote:
"Jeffrey D. Asshole" But these are so much nicer to keep the shop warm with. ;-) Why don't you go drop dead- asshole ?? .... Phil Come back when your meds kick it. "Flame all you want, I'll make more" Jeff -- “Egotism is the anesthetic that dulls the pain of stupidity.” Frank Leahy, Head coach, Notre Dame 1941-1954 http://www.stay-connect.com |
#11
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What signal generator for audio work?
On Apr 17, 11:38*am, Jeffrey D Angus wrote:
Robert Macy wrote: Then I started using the sound card as a 'scope' and then as a spectrum analyzer. So now I have a two channel input high quality spectrum analyzer with two channel tracking generator outputs! Ya wanna give us a hint as to who's software you're using? Jeff -- “Egotism is the anesthetic that dulls the pain of stupidity.” Frank Leahy, Head coach, Notre Dame 1941-1954 http://www.stay-connect.com Much software came on CD with the soundcard, but did not do exactly what I wanted I think everything you need is free and available at sourceforge under gnu license. There may be other free, or low cost, utility software out there, don't know Basically, you need software to talk to the soundcard and software to manipulate what you want to do. To talk to the soundcard, I used the soundcard's 'built-in' ASIO drivers and used ASIO SDK from Steinberg. To write custom C programs, I used free MS command line C compiler. For FFT, I used the free 'fastest FFT in the west' called fftw http://www.steinberg.net asiosdk2.2.zip |
#12
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What signal generator for audio work?
Robert Macy wrote:
Basically, you need software to talk to the soundcard and software to manipulate what you want to do. Thanks Robert Jeff -- “Egotism is the anesthetic that dulls the pain of stupidity.” Frank Leahy, Head coach, Notre Dame 1941-1954 http://www.stay-connect.com |
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