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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 18th January 2018, 01:49 AM   #451
drpro is offline drpro  United States
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My boards arrived today. Thank you X.

Question, from my reading the daughter boards let you set the gain. I ordered an extra set of DB, so I hope I read right. Looking for one set with 4v p-p and the other 20v p-p. In my reading haven't discovered what values, guessing here of resistors for setting the different outputs.
Tnx
David
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Old 18th January 2018, 04:38 AM   #452
ammel68 is offline ammel68  United States
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AKSA's Lender Preamp with 40Vpp Output
Quote:
Originally Posted by xrk971 View Post
Do yourself a favor and get these headband magnifiers. I am knocking on 50 as well and eyesight is not what it used to be either. Even for TH soldering, I wear them half the time. I have used them for 5 years - same basic $7 model (nowadays $9). Also, you will need a good pair of stainless steel tweezers, preferably Swiss made and about $25, a smaller solder iron tip (but I like to use solder paste from a syringe and a hotplate).

SE MH1047L Illuminated Multi-Power LED Head Magnifier - Magnifying Glass - Amazon.com

But, like I said, this Aksa Lender pre is available as all TH construction. Btw, the main board is a healthy 135mm x 114mm.

So I have the M3 as well, and am comparing them now. You will not regret making the Aksa Lender - it sounds better, is quieter, can get way more voltage swing and not go nuts with distortion.
Thank you for the suggestions, X!
I've got to try to Hugh's Lender. If it kicks the Magni 3's a$$ in SQ as a preamp, then color me impressed.
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Old 18th January 2018, 06:56 AM   #453
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Just cased it up now I can take it with me to work
Aksa Lender HPA-aksa-lender-hpa-amp-01-jpg

Aksa Lender HPA-aksa-lender-hpa-amp-02-jpg

Aksa Lender HPA-aksa-lender-hpa-amp-03-jpg
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Old 18th January 2018, 09:02 AM   #454
robert1325 is offline robert1325  Netherlands
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Would this pre work well in front of a class d amp like the new tpa32xxevm boards? I wouldn't need much gain.
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Old 18th January 2018, 02:07 PM   #455
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Well, it works well in front of any power amp IMO as it is essentially a noise-free way to get volume control and provide a constant impedance to the ampís input stage to make sure bass extension is a deep as it can be. On ultra low ppm levels of distortion amps, it will give a slight SE Class A harmonic signature.

I use a Pocket Class A as a preamp for the TPA3116D2 and that works very well.
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Old 18th January 2018, 02:10 PM   #456
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Be sure to check out GB thread - tips on stuffing TH:
Click the image to open in full size.
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Old 20th January 2018, 09:11 PM   #457
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Congrats to Vunce who got his up and running! Beautiful work!


Click the image to open in full size.
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Old 29th January 2018, 04:14 AM   #458
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
The new ALPHA amp thread is here:

Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier

Sneak preview of performance:
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier-alpha-1-19amp-2-83vrms-8ohms-fft-jpg
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Old 2nd February 2018, 05:59 AM   #459
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
I forgot to mention to folks following this thread, in case you haven't seen it yet, there is a nice Class A amp based on this front end that Hugh came up with called the ALPHA (Aksa Lender P-mos Hybrid Aleph). The thread is here:

Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier

Here is the PCB layout by JPS64:
Click the image to open in full size.

Click the image to open in full size.

FFT for 2.83vrms into 8ohms with 1.2amps bias:
Click the image to open in full size.
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Old 3rd February 2018, 01:15 AM   #460
GnuB is offline GnuB  United States
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AKSA's Lender Preamp with 40Vpp Output
Thanks X, boards arrived today. :-)
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