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Which preamp for Amp Camp?
Which preamp for Amp Camp?
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Old 15th July 2017, 04:11 PM   #21
2 picoDumbs is offline 2 picoDumbs  Australia
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Audio Nirvana Classic 8" Ferrite or Classic 10" Ferrite 98dB/2.83V
Only $228/$298 (respectively) for the pair. Bloody bargain
Fullrange speakers. DIY speakers. DIY Speaker kits. DIY Audio. Open Baffle Speakers. Fullrange drivers. Audio Nirvana, Lowther, Fostex. Vacuum Tube Amplifiers For Sale
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Old 15th July 2017, 11:19 PM   #22
Skylar88 is offline Skylar88  South Africa
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Quote:
Originally Posted by AndrewT View Post
the now unfashionable 8" mid bass and 1" treble does nicely.
It was designed to be cheap but still gives very acceptable performance.

You can go down to a 5" or 6" mid bass, but this limits the low bass too much for many. However it may give a cleaner upper mid and a nicer cross from mid to treble.
That could be enough to make it seem better than an 8".

If you go for a reasonably efficient 6"+1" because you like the upper bass, mid and treble, you can at some later date add in a low bass only speaker and amplifier.

Thank you for the options, AndrewT. It's certainly is food for thought.

Appreciated.

Christo
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Old 16th July 2017, 10:19 AM   #23
Skylar88 is offline Skylar88  South Africa
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About the two pots in the B1.. Are they for adjusting the two channels seperately or is one for main volume and the other for balance? If it's not the latter, how difficult would it be to add a balance pot?

I also can't understand why the B1 is called a 'buffer preamp' if there is no gain. Maybe because the input and output impedances are different?

Christo
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Old 16th July 2017, 12:01 PM   #24
Skylar88 is offline Skylar88  South Africa
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I have also asked the questions above in the B1 Buffer Preamp
thread, because this is probably not the right forum to ask about the B1..

Christo
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Old 16th July 2017, 04:02 PM   #25
AndrewT is offline AndrewT  Scotland
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the preamp descriptor can be applied to just about any amplifier that is used to feed a Receiver.
Most pre-amps have some gain in at least some of the stages.

A Buffer pre-amp to me means a no gain active stage that can be used to feed a Receiver.
The Buffer addition tells me there is no active gain. I consider that Buffer over-rules any guessing on whether the pre-amp has gain, or not.
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Old 16th July 2017, 04:13 PM   #26
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by Skylar88 View Post
I also can't understand why the B1 is called a 'buffer preamp' if there is no gain. Maybe because the input and output impedances are different?
Yep, it's a voltage buffer/follower, but there is current gain Buffer amplifier - Wikipedia
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Old 16th July 2017, 04:16 PM   #27
AndrewT is offline AndrewT  Scotland
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A Buffer does not necessarily give current gain.
Take a Single Ended ClassA stage set to a bias current of 5mA.

The maximum symetrical output current is <5mApk

Now send the input from a run of the mill opamp Source which can output 20mApk without overloading and maybe get up to 35mApk as a short circuit output.
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Old 30th October 2018, 03:52 PM   #28
Esperanto is offline Esperanto  United States
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Default MooseFET no longer available

Dave @planet 10-HiFi,

I looked at the link you provided and classic valve is no longer making the MooseFET Line Preamp PCB anymore . Is there just as good, or better preamp that works well with the Amp Camp Amp?

Thank You
Kurt
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Old 30th October 2018, 04:48 PM   #29
Skylar88 is offline Skylar88  South Africa
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Quote:
Originally Posted by Esperanto View Post
Is there just as good, or better preamp that works well with the Amp Camp Amp?

I recently built the AKSA Lender Preamp for use with my ACA. All I need to say is, it rocks! I had a B1 before and there is no comparison. The B1 was fine on most music because I have fairly efficient speakers (94dB), but I always felt that something was missing. The AKSA Lender raised the bar and I'm in sonic heaven right now.

Unfortunately the AKSA Lender wasn't developed yet when I started this thread, because it is the preamp I should have built first.
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Old 31st October 2018, 06:44 PM   #30
Esperanto is offline Esperanto  United States
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Skylar,
Thank you for the advice on the AKSA Lender Preamp. I was doing some research on this site in the AKSA preamp thread and got some great advice. I was planning on getting the ACA, but i'm thinking there might be an amp that works more synergistic with this preamp. I sent XRK a message for some advice and as soon as I know which amp to get, I will place an order for some boards. I'm in Illinois, so I thought I would contact Gtose for some building advice since he built this preamp. I was planning to use these electronics to run some Home Theater Monitors (HTM-12's) from the diysoundgroup website. The sensitivity for these speakers are 97db-2.83v/1m so they should be a good match for these electronics.
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