The amp very early 90’s at the latest since Alpine moved amp manufacturing to Mexico then. I built a few Alpine systems back then and did some repair. Alpine was first with many techonologies in car stereo in that era. They were first with smd’s, encoders instead of potentiometers, and elimination of traditional stranded wires in their head units.
@@audiokeller1975 A little bit more info : At the time of this amp's manufacture, Alpine was carried only by higher end car stereo shops because of their return policy. Alpine did not automatically issue a credit to a retailer for returns like other manufacturers did. Customer returns needed to be sent back to Alpine for a full bench test before a credit was issued. The only mass retailer to carry Alpine under that policy was a best buy like store called "the good guys". Their open box counter sold such Alpine returns with a full test bench report from the Alpine service center. The amplifier reports included "dyno tests" that showed the amps were under rated by at least 20%.
It would have been nice to see what this amp did at 4 ohms mono on a continuous test. It is rated to run at this configuration so it would have handled it no problem
Usually you are right but the reason I didn’t test it is that after fixing the amp I adjusted the railvoltage but i didn’t find a service manual with values where to set it so I set it a little lower. ( first I thought it’s the bias pot but wasn’t ) I’m sure the amp will even do more power if adjusted correctly. Efficiency was low at 8 Ohms Mono, around 50% and the amp isn’t my own that made me decide not to do a 4 ohms mono continuous test but the dynamic test, I think reduce the dynamic value by 50 Watts may be the continuous result. The continuous test creates much more heat so I didn’t want to push the amp that hard and the amp is old and not mine and I don’t have spare parts for it.
@@audiokeller1975 habe die eingebaut. Die Endstufe schaltet bei etwas mehr als "zimmerlautstärke" ab. Mache ich leiser geht die wieder an. Andere Endstufe angeschlossen und alles geht. Kann also nicht an der Verkabelung liegen. Was kann das sein ?
Wird die Endstufe dabei sehr warm? Wie sieht es bei der genannten Zimmerlautstärke aus mit Vibrationen? Ich könnte mir noch einen Wackelkontakt am Remote Eingang vorstellen , so einen Fehler hatte ich mal an einer alten pioneer Endstufe.
Wird nicht warm. Vibrationen sind auch nicht vorhanden. Wenn die Musik leise ist, läuft die. Ein "schlagen" mit der Faust auf die Endstufe ändert auch nix (Wackelkontakt €
Ok. The truth. The design isnt japanese..my friend rich coe designed these amps im almost certain. Now would be a good time to explain that is actually how they teach in college. Voltage is king..most people misunderstand when amps put out more power in a short time period..DYNAMIC HEADROOM..is a fake .. time dictated/ frequency regulated weakness.. hear me out please..ill explain..What if you had a tractor with a small float bowl on the carberator and a fuel pump with the voltage reduced to lets say 6v..heres what happens..when you put down the plow and start doing work..the tractor shows impressive ability..but as time passes the float bowl fuel level gets lower and lower.. depending on how hard you load the tractor..the time needed to empty the float bowl is linear slope..so you advertise how fast that tractor can plow lets say 20 feet..when in reality theyre hiding the fact that it cant 40 or 50 feet cause it runs outta fuel .Get it? ITS A SALESMANS LIE. It should not care. It should plow as long as needed In exactly the same way.Amp power supply rails should never move any..Period.. if it does it cant faithfully rproduce the signal..THIS IS NOT TAUGHT..heres why..an amp must follow ohms law and double power as imp is halved..MUST ..I will disclose that..its easy to fix this.
I get it and agree but: what if we have two amps with 100watts per channel of continuous power? Amp1 delivers 100 Watts of cont power but no dynamic headroom. Amp2 also delivers 100 Watts of continuous power but has dynamic headroom of 3db which lets him put out 200watts for a short time ? Which one sounds better? I ask this question because people say that most people don’t listen to continuous signals which has a different crest factor like music. I included the burst tests because Rockford did this with the Power Cube ratings. And its very interesting that this amp is an American design 😳 I found a pot on the board and with this pot you can adjust the rail voltage 😀
Had one of these in 1992-93. It did the job really well
Oh yes finally, been waiting for this one.
Awsome. More old school Alpine!
Great video as usual 👏👏👏👏⭐⭐⭐⭐⭐
Thank you very much! I’m glad you like it 👍👍
The amp very early 90’s at the latest since Alpine moved amp manufacturing to Mexico then. I built a few Alpine systems back then and did some repair. Alpine was first with many techonologies in car stereo in that era. They were first with smd’s, encoders instead of potentiometers, and elimination of traditional stranded wires in their head units.
Thanks for the info , I really like reading historical stuff about this 👍👍👍
@@audiokeller1975 A little bit more info : At the time of this amp's manufacture, Alpine was carried only by higher end car stereo shops because of their return policy. Alpine did not automatically issue a credit to a retailer for returns like other manufacturers did. Customer returns needed to be sent back to Alpine for a full bench test before a credit was issued. The only mass retailer to carry Alpine under that policy was a best buy like store called "the good guys". Their open box counter sold such Alpine returns with a full test bench report from the Alpine service center. The amplifier reports included "dyno tests" that showed the amps were under rated by at least 20%.
It would have been nice to see what this amp did at 4 ohms mono on a continuous test. It is rated to run at this configuration so it would have handled it no problem
Usually you are right but the reason I didn’t test it is that after fixing the amp I adjusted the railvoltage but i didn’t find a service manual with values where to set it so I set it a little lower. ( first I thought it’s the bias pot but wasn’t ) I’m sure the amp will even do more power if adjusted correctly. Efficiency was low at 8 Ohms Mono, around 50% and the amp isn’t my own that made me decide not to do a 4 ohms mono continuous test but the dynamic test, I think reduce the dynamic value by 50 Watts may be the continuous result. The continuous test creates much more heat so I didn’t want to push the amp that hard and the amp is old and not mine and I don’t have spare parts for it.
🤘😎
Hallo Audiokeller, ich habe diese Endstufe bei Kleinanzeigen gekauft und habe eine Frage dazu.
Moin!
Na dann raus damit 😊
@@audiokeller1975 habe die eingebaut. Die Endstufe schaltet bei etwas mehr als "zimmerlautstärke" ab. Mache ich leiser geht die wieder an. Andere Endstufe angeschlossen und alles geht. Kann also nicht an der Verkabelung liegen. Was kann das sein ?
Wird die Endstufe dabei sehr warm? Wie sieht es bei der genannten Zimmerlautstärke aus mit Vibrationen? Ich könnte mir noch einen Wackelkontakt am Remote Eingang vorstellen , so einen Fehler hatte ich mal an einer alten pioneer Endstufe.
Wird nicht warm.
Vibrationen sind auch nicht vorhanden. Wenn die Musik leise ist, läuft die.
Ein "schlagen" mit der Faust auf die Endstufe ändert auch nix (Wackelkontakt €
@dfgert8105 dann fällt mir erstmal nichts ein, was hängt als Last an der Endstufe?
Ok. The truth. The design isnt japanese..my friend rich coe designed these amps im almost certain. Now would be a good time to explain that is actually how they teach in college. Voltage is king..most people misunderstand when amps put out more power in a short time period..DYNAMIC HEADROOM..is a fake .. time dictated/ frequency regulated weakness.. hear me out please..ill explain..What if you had a tractor with a small float bowl on the carberator and a fuel pump with the voltage reduced to lets say 6v..heres what happens..when you put down the plow and start doing work..the tractor shows impressive ability..but as time passes the float bowl fuel level gets lower and lower.. depending on how hard you load the tractor..the time needed to empty the float bowl is linear slope..so you advertise how fast that tractor can plow lets say 20 feet..when in reality theyre hiding the fact that it cant 40 or 50 feet cause it runs outta fuel
.Get it? ITS A SALESMANS LIE. It should not care. It should plow as long as needed
In exactly the same way.Amp power supply rails should never move any..Period.. if it does it cant faithfully rproduce the signal..THIS IS NOT TAUGHT..heres why..an amp must follow ohms law and double power as imp is halved..MUST ..I will disclose that..its easy to fix this.
I get it and agree but: what if we have two amps with 100watts per channel of continuous power?
Amp1 delivers 100 Watts of cont power but no dynamic headroom.
Amp2 also delivers 100 Watts of continuous power but has dynamic headroom of 3db which lets him put out 200watts for a short time ?
Which one sounds better?
I ask this question because people say that most people don’t listen to continuous signals which has a different crest factor like music.
I included the burst tests because Rockford did this with the Power Cube ratings.
And its very interesting that this amp is an American design 😳 I found a pot on the board and with this pot you can adjust the rail voltage 😀
Yesssir👍