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Old 10th January 2008, 11:00 AM   #1
56oval is offline 56oval  Australia
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Default Need help to choose a Pass amp

Hello Passlab diyer's .
I'm new to diy ,but have friends that can help .
I'm tri-amping an new speaker and I'm using 300B SET's for the
Tweeter & mids .I need something for the bass driver which is a
PHL 12" 4530 ,94db ,min6.2ohm@ 250hz .Xover point is 350hz.
Is the A40 to old a design and how would the F4 go I think my pre has a gain of 20 .I sit about 3 to 4 metres away from the speakers .
Any help much appreciated ,

Cheers.
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Old 10th January 2008, 02:43 PM   #2
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With a fairly efficient woofer you're not going to need all that much power. The A-40 can be built, but the output devices were rare even when the design was new--impossible to find now. I believe Nelson posted some suggestions as to what devices might make good substitutes, but I have no idea how to tell you where to find that post.
More buildable designs would include the A-75 and the smaller Alephs. Note that the output stage of the A-75 can be scaled up or down if you want more or less power. However, my experience (I'm quad-amped and my main midrange amp is tubed) is that the Alephs are pretty decent matches for tubes, as they have a somewhat warmer sound. Your candidates there would be either of the Volksamp versions--a 30W and a 60W--or the 'normal' Aleph 3 at 30W. There was a 60W Aleph, but I can't remember the model number at the moment. It was either the 4 or the 5.

Grey
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Old 10th January 2008, 02:54 PM   #3
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Quote:
Originally posted by GRollins
There was a 60W Aleph, but I can't remember the model number at the moment. It was either the 4 or the 5.

Grey
The A5 is 60W. The A4 is a 100W which I think will be an overkill for the application.
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Old 10th January 2008, 07:42 PM   #4
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Depending on what kind of hurry you're in, I do have a new
DIY amp coming up that would take the place of an A40. It's
going to be a very simple design.

The PHL 4530 is particularly easy to drive, so almost anything
will do the job.

What are you going to use for the mid and top drivers?
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Old 10th January 2008, 10:51 PM   #5
56oval is offline 56oval  Australia
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Hello Nelson, I,m in no hurry will be building the mid & tweeter amps first .

For the treble I,m using the Raven R1 ,1.1,94db @ 2.6 ohms above 1000hz ,so the output trannies will be wound to match impedance.

The midrange driver is a 6.5" PHL 1120 ,96db 8 ohms.

Thanks for the replies

Cheers.
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Old 11th January 2008, 04:46 AM   #6
56oval is offline 56oval  Australia
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Hello Nelson ,I would also be interested in your buffer splitter
as I will be using passive xxovers .The F3 sounds very interesting.

regards
56.
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Old 12th January 2008, 01:29 AM   #7
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Quote:
Depending on what kind of hurry you're in, I do have a new....

WooHoo! can't wait to see it!!!!!!!

I think this thread must have escaped everyone's attention, or there would be alot more excitement about this!

JJ
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Old 12th January 2008, 08:21 AM   #8
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by jupiterjune



WooHoo! can't wait to see it!!!!!!!

I think this thread must have escaped everyone's attention, or there would be alot more excitement about this!

JJ

you think?

seems to me that - in last few yrs - greedy boyz are at least two amps after Papa ........... mebbe they are just scarred



besides that - I'll be glad to see it ...... new spark
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Old 12th January 2008, 03:12 PM   #9
Magura is offline Magura  Denmark
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Quote:
Originally posted by Zen Mod



you think?

seems to me that - in last few yrs - greedy boyz are at least two amps after Papa ........... mebbe they are just scarred



Depending which greedy boys you're talking about, and which branch of amps


Magura
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Old 12th January 2008, 04:12 PM   #10
lykkedk is offline lykkedk  Denmark
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Hey... cool it ... ... It might be, that it's CHOKE loaded

Jesper..
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