Is there a way to accurately test a used amp with out hooking it up to speakers to
make sure you are not getting a piece of junk?
Buying used amps
Buying used amps
My initials are in the view finder of every camcorder (REC)
2xOT12(Deltalite 2512 loaded, w/melded arrays)
2xOT12(Deltalite 2512 loaded, w/flat array) "In Process"
4xT30(24", 4012HO loaded)
1xAT
2xOT12(Deltalite 2512 loaded, w/melded arrays)
2xOT12(Deltalite 2512 loaded, w/flat array) "In Process"
4xT30(24", 4012HO loaded)
1xAT
Re: Buying used amps
An RMS voltmeter and a test tone generator for solid state amps, but not on tube amps. Most tube amps require an output load. Plus, this will not tell you if the amp has any noise in the chain.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice
Re: Buying used amps
You can make a dummy load from these.
http://search.digikey.com/scripts/DkSea ... T200-25-ND
http://media.digikey.com/photos/Hunting ... 200-25.JPG
Set two in parrallel and adjust them to equal 13 ohms each and they will give you a 400 watt 6.5 ohm static dummy load for under 50 bucks. I would highly recommend you mount to a heavy wooden base and use no paint. Mounting to any type of metal would require some sort of heavy duty high heat insulators like ceramic standoffs etc.
With a high current dummy load you can use SMAART or another RTA type program that has the coherency capabilities. You simply compare the noise signal sent through the amp to the original noise signal generated by SMAART.(of course it will be necessary to pad the amps output reading with a series resistor or perhaps go through a D box that accepts speaker level signals. Thats what I generally use. My old DOD direct boxes work well for this.
You will immediately see if there's any difference in output between channels or non linearity's that exist when the amp in outputting the signal!
http://search.digikey.com/scripts/DkSea ... T200-25-ND
http://media.digikey.com/photos/Hunting ... 200-25.JPG
Set two in parrallel and adjust them to equal 13 ohms each and they will give you a 400 watt 6.5 ohm static dummy load for under 50 bucks. I would highly recommend you mount to a heavy wooden base and use no paint. Mounting to any type of metal would require some sort of heavy duty high heat insulators like ceramic standoffs etc.
With a high current dummy load you can use SMAART or another RTA type program that has the coherency capabilities. You simply compare the noise signal sent through the amp to the original noise signal generated by SMAART.(of course it will be necessary to pad the amps output reading with a series resistor or perhaps go through a D box that accepts speaker level signals. Thats what I generally use. My old DOD direct boxes work well for this.
You will immediately see if there's any difference in output between channels or non linearity's that exist when the amp in outputting the signal!
Ever since I replaced sex with food I cant even get into my own pants!
Re: Buying used amps
Thanks, that is what I was looking for
R
R
My initials are in the view finder of every camcorder (REC)
2xOT12(Deltalite 2512 loaded, w/melded arrays)
2xOT12(Deltalite 2512 loaded, w/flat array) "In Process"
4xT30(24", 4012HO loaded)
1xAT
2xOT12(Deltalite 2512 loaded, w/melded arrays)
2xOT12(Deltalite 2512 loaded, w/flat array) "In Process"
4xT30(24", 4012HO loaded)
1xAT