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Amp Camp Amp - ACA
Amp Camp Amp - ACA
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Old 23rd February 2019, 02:57 PM   #7141
propitious is offline propitious  United States
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Amp Camp Amp - ACA
Hi U-man, great to hear from you. I built a ACA from the first kit series offered, which just had a HeatsinkUSA 8.46 heatsink, which is 8.46" x 1.3" by 3' tall. It was fine for the earlier 1 amp bias current, but I would not want to put much more heat through it. Your heatsink should take the higher bias and 24 VDC. I took that ACA to a friend, and we rigged up a temporary output from one of his guitar amp preamp sections (I do not remember which one). He tried it on several different guitars and even a bass guitar. We were very impressed. It was more smooth, clear and detailed than his other solid state amps. It let through what was sent to it (more undistorted distortion, or is that an oxymoron?) We decided a necessary component would be a good tube preamp that would allow you to overdrive it to get the desired distortion and not try to overdrive the ACA. Zen Mod knows a lot about that and might chime in here with ideas.The best sounding guitar speaker we tried it on was the one that came with the Orange Tiny Terror.
Give me a PM or call me some time and we will talk more about it.
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Old 23rd February 2019, 04:09 PM   #7142
LongRoad is offline LongRoad  Russian Federation
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Tell me which transistors are better for the amplifier, who has experience?
My head is spinning
IRF250P224 , IRFP250PBF , IRFP244PBF , IRFP240PBF
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File Type: png PАSS-A3схема.png (49.1 KB, 68 views)
File Type: png alephJ.png (54.8 KB, 63 views)
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Old 23rd February 2019, 04:19 PM   #7143
6L6 is offline 6L6  United States
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Amp Camp Amp - ACA
For what amplifier? You’ve got 3 different amplifier topologies in your schematics.
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Old 23rd February 2019, 04:32 PM   #7144
LongRoad is offline LongRoad  Russian Federation
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Originally Posted by 6L6 View Post
For what amplifier? You’ve got 3 different amplifier topologies in your schematics.
All of the output stage operates in the same mode.
I am interested in which of the transistors with less noise and works better in such switching IRF250P224 , IRFP250PBF , IRFP244PBF , IRFP240PBF ?
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Old 23rd February 2019, 04:37 PM   #7145
TungstenAudio is offline TungstenAudio  United States
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If the ACA is the target amplifier, then the IRFP240 (pbf) is the default choice, and the best place to start. Since that transistor is also the default for the Aleph J and other FW clones, it is convenient as well. The ACA does not require matched power transistors, so it may use 'leftovers' from matching devices for other builds.


I am presently experimenting with IRFP140 devices in one of my ACA builds. This transistor shows a lot of promise, but needs a higher voltage to distinguish itself from the IRFP240. Something to do with the forward transconductance vs Vds properties.
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Old 23rd February 2019, 04:54 PM   #7146
LongRoad is offline LongRoad  Russian Federation
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Quote:
Originally Posted by TungstenAudio View Post
If the ACA is the target amplifier, then the IRFP240 (pbf) is the default choice, and the best place to start. Since that transistor is also the default for the Aleph J and other FW clones, it is convenient as well. The ACA does not require matched power transistors, so it may use 'leftovers' from matching devices for other builds.
Thank you very much for the advice
I also read that 240 is good. Now many people praise 250, many variations.
Everyone praises his concept. It distorts the truth.
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Old 23rd February 2019, 05:50 PM   #7147
udailey is offline udailey  United States
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Hey 6L6 and proitious
Thanks for your replies
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Originally Posted by propitious View Post
Hi U-man, great to hear from you.
I'll contact you Propitious. Glad you liked it with the guitar.
Uriah
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Old 23rd February 2019, 06:10 PM   #7148
petrnyc is offline petrnyc
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Hello,
Anyone knows what size in CM are the heat sinks in the Amp Camp Amp kit chassis?
thank you
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Old 23rd February 2019, 11:27 PM   #7149
astromo is offline astromo  Australia
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Quote:
Originally Posted by petrnyc View Post
Hello,
Anyone knows what size in CM are the heat sinks in the Amp Camp Amp kit chassis?
thank you
Head to store and if you find yourself at the chassis page for the ACA, you'll see it mentions a 2U chassis.
Go to the chassis page and check out a Mini Dissipante 2U. As I understand it, that's the bare bones equivalent of the ACA. Dimensions can be found there. Don't forget to divide by 10 to convey from mm.
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Old 23rd February 2019, 11:44 PM   #7150
maf_au is offline maf_au  Australia
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Hi, my ACA 1.6 sounds great.

Unfortunately, with the volume on reasonable sound, (not loud), it is crackling the tweeters on our Rogers speakers.

If I add an extra Pass ACA, would it make enough power for a variety of speakers that would stop the crackling in the speakers or should I swap to something else with higher power to build? Would want something that sounds as good as the Pass ACA.
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