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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 2nd October 2018, 09:27 AM   #861
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by adason View Post
Nice work X, as always. Do not forget that some of those amplifiers you mentioned have mosfets on the input which do not like to exceed 20 volts on the gate, hence the zener diodes protecting the gate.
That is special the case with the DN2540 or other depletion mosfets.

Nice work X I have now with the circlotron also very low distortion, -120dB when output 2 amps, the DN2540 is cleaner, and needs higher idle, that is why drain resistors are 680 ohm in stead of 1.5k.

regards
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Old 18th October 2018, 01:03 PM   #862
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Please see one the finest Aksa Lender Preamp builds by Gtose in GB thread:
AKSA's Lender Preamp with 40Vpp Ouput GB

Powering Super MoFo in his main system:
Click the image to open in full size.
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Old 24th October 2018, 10:09 PM   #863
Skylar88 is offline Skylar88  South Africa
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Got mine working today. Powered it up and it worked first time.
It still needs some work on the chassis, but I listened for a few hours and apart from more volume due to the gain (about 15dB. R11 = 2K2), I can hear an improvement in the soundstage and imaging. I've been using a B1 buffer up till now and really got used to how the ACA and B1 sounds on the 0.53x Karlsonators with dual 3FE25-16's. The AKSA Lender's sound is different - in a good way.

Thanks to Hugh, X and JP for making this design available. You guys rock.
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Old 25th October 2018, 12:22 AM   #864
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Beautiful work, Skylar! That’s a nice layout you have there and I see you even made the input selector panel. Glad it worked the first time. If the ACA is about 14dB gain, and the Aksa Lender Preamp is 15dB, you have 29dB of total gain which is about the usual gain for most amps designed to be driven by line level sources. If you like less gain just increase the ground shunt resistor R11 to 3k3 maybe?
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Old 25th October 2018, 12:33 AM   #865
zman01 is offline zman01  Bangladesh
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AKSA's Lender Preamp with 40Vpp Output
Skylar88,

Echoing X's comments on the layout, very tidy and elegant inside.

The chassis that you're working with, is it a standard make or custom? What are the dimensions?
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Old 25th October 2018, 12:54 AM   #866
Vunce is offline Vunce  United States
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AKSA's Lender Preamp with 40Vpp Output
Real nice work Skylar88!!
I like that you included the power supply in the enclosure with a conventional ac switched input.

Congratulations
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Old 25th October 2018, 07:03 AM   #867
Skylar88 is offline Skylar88  South Africa
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Thanks guys. I'm please with how this project turned out. The amount of gain seems right, X.

No comments about the two separate pots?

It's a feature that got carried over from the B1 because I like to have balance control.

@zman1
It's a custom made alu box that I've had for many years from an aborted non-audio project. The box was much too high, so I had to chop the top 60% off and then I had to build a bending brake to make a new lid. The new size is 225 x 175 x 71 high with the lid on.

I had two of these boxes and used the other for the B1 one last year.
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Old 25th October 2018, 11:14 PM   #868
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Thanks for the article on the bending brake. Very handy to have.
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Old 26th October 2018, 01:09 AM   #869
AKSA is offline AKSA  Australia
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Skylar,

One of the best preamps I have ever seen, beautifully, almost factory assembly.
Preamps are difficult because there are lots of inputs, controls, and metal holes. Lots of wire too, and tricky to keep them quiet.
The EI transformer is outstanding in this role because at low power the magnetic field is well controlled, important for a preamp.
Congratulations!!

Hugh
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Last edited by AKSA; 26th October 2018 at 01:13 AM.
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Old 26th October 2018, 07:03 AM   #870
Skylar88 is offline Skylar88  South Africa
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Thanks Hugh. It really means a lot to me, coming from Mr AKSA himself.

I also need to thank all the diyAudio members who contribute to this and the GB thread, clarifying preamp building mysteries. As a relatively new audio hobbyist, I still have a lot of questions.

I'm really enjoying this preamp. Never expected it to be this good!
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