Well, I have barely finished a speaker project before a new one is coming up. This one will be something different - I plan to go the active way. So far the speaker planned is a three way closed box design using Linkwitz transform to get proper LF response.
But what amps do you guys recommend (class a is no-go!)? I plan to use SS D2905/950000 in combination with 2 SS 22W/8851T00. I have not yet decided which midrange to use.
I'm quite interested in the Leach amp. But what are its strengths?
But what amps do you guys recommend (class a is no-go!)? I plan to use SS D2905/950000 in combination with 2 SS 22W/8851T00. I have not yet decided which midrange to use.
I'm quite interested in the Leach amp. But what are its strengths?
leach amp
🙂 hi sobazz,
which leach amp are you refering, the single barrel or double barrel. i have both built the leach amp, the single barrel was easy but not the double barrel. they both performed well.
as to how they sound, well its a very subjective matter, the sound i like may not be for you, you know what i mean. but one thing i can assure you they dont add any color to what a sound should sound which is my only criteria for a good amp. i dont like sound enhancers like inxcreasing the bass for a more pronounce impact or increasing the mid. natural sound is what i prefer.😉
🙂 hi sobazz,
which leach amp are you refering, the single barrel or double barrel. i have both built the leach amp, the single barrel was easy but not the double barrel. they both performed well.
as to how they sound, well its a very subjective matter, the sound i like may not be for you, you know what i mean. but one thing i can assure you they dont add any color to what a sound should sound which is my only criteria for a good amp. i dont like sound enhancers like inxcreasing the bass for a more pronounce impact or increasing the mid. natural sound is what i prefer.😉
not tiring to listen to even at high volumes
i have built only doubled barreled leach amps, i have done it with japanese transistors, even with 2n3055/mj2955 at rail voltages of +/-55 and the sound is very good indeed!!!! i built around 30 of them.....
i have built only doubled barreled leach amps, i have done it with japanese transistors, even with 2n3055/mj2955 at rail voltages of +/-55 and the sound is very good indeed!!!! i built around 30 of them.....
Used a Leach amp for years and it served me very well. In comparison to other SS-AB amps it performs well and I doubt you would be disappointed.
Also have a look at the following:
http://www.aussieamplifiers.com/
http://sound.westhost.com/projects-1.htm
Mark
Also have a look at the following:
http://www.aussieamplifiers.com/
http://sound.westhost.com/projects-1.htm
Mark
Hi there!
I have been building amps for a long time too, I built my Leach Low TIM amp 3 months ago and have been impressed ever since. Try it, you'll like it. 😉 It is one of the things I have done that I didn't regret. 😀
JojoD
I have been building amps for a long time too, I built my Leach Low TIM amp 3 months ago and have been impressed ever since. Try it, you'll like it. 😉 It is one of the things I have done that I didn't regret. 😀
JojoD
Re: not tiring to listen to even at high volumes
I thought 2955/3055 are 60v devices. and they have no problem working with +/-55v rails?
joan2 said:
I thought 2955/3055 are 60v devices. and they have no problem working with +/-55v rails?
Re: not tiring to listen to even at high volumes
What power levels did you achieve with +/-55 volts and the stated transistors? How low an impedance were you able to drive on a continuous basis?
joan2 said:
What power levels did you achieve with +/-55 volts and the stated transistors? How low an impedance were you able to drive on a continuous basis?
used them in series
i wired them is series so that at any point, there is no more than 55volts accross any of them, anyways i was able to get 100watts into 8ohms, i used a torroid transformer, this was in 1992, i also changed some resistor values in the input defferential stage to preserve the current bias as originally designed....fyi, i test all my amps with a dummy load of 8R, fed with a 1khz sine wave signal from my heatkit sine-square signal genrator, i do not have a thd meter so i make sure the clipping leds do not ligth up in doing the test...i get around 29volts ac output@1khz!! at full output with both channels driven, the rails sag to about 49 volts!!!
i wired them is series so that at any point, there is no more than 55volts accross any of them, anyways i was able to get 100watts into 8ohms, i used a torroid transformer, this was in 1992, i also changed some resistor values in the input defferential stage to preserve the current bias as originally designed....fyi, i test all my amps with a dummy load of 8R, fed with a 1khz sine wave signal from my heatkit sine-square signal genrator, i do not have a thd meter so i make sure the clipping leds do not ligth up in doing the test...i get around 29volts ac output@1khz!! at full output with both channels driven, the rails sag to about 49 volts!!!
to complete the picture
i used tip41c/42c, for drivers, 92pu06/92pu56 for vas and predirvers, and finally bc556/546 to92's for the small transistors....
i used tip41c/42c, for drivers, 92pu06/92pu56 for vas and predirvers, and finally bc556/546 to92's for the small transistors....
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