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Old 29th November 2017, 02:30 PM   #651
se77en is offline se77en
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Join Date: Feb 2016
Default preamp

please, sir ljm - will this one be available some day?
and if, do you recommend combining it with your preamp nr. 9?
thank you very much...
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Old 30th November 2017, 03:11 PM   #652
pinnocchio is offline pinnocchio  Canada
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Join Date: Sep 2010
Location: Montreal
You can get it here:

Aiyima 2PC L20.5 Dual Channel Audio Amplifier Board Amplificador 250W*2 HIEND Ultra low Distortion KEC KTB817 KTD1047 AMP-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

LJM L20.5 Dual-Channel Power Amplifier Board Finished KTB817 KTD1047 200W+200W | eBay


That was just a quick search on Google

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PREAMPs : Bal AMB α10 + JC-80 | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | USSA3 & 5 | FO v1.4 | TGM8 | VZ Audio NS OPS | NX Amp | FC-100
DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3

Last edited by pinnocchio; 30th November 2017 at 03:14 PM.
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Old 30th November 2017, 05:20 PM   #653
se77en is offline se77en
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Join Date: Feb 2016
Default sorry -

- so sorry!

thank you very much...
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Old 8th January 2018, 10:59 PM   #654
2ramiro is offline 2ramiro
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Join Date: Feb 2017
Hello
I have 2 l15d Modules they were working fine but then i accidentally pulled the input cable from the computer out while the amp was working.
After that one amp makes loud noise , and after some seconds r29 starts smocking , it already burned the c9 one time.
I can't find any broken part and it also sounds nearly normal if you turn the Volume above the noise level.
Any idea where to find the issue ?
Thanks
Ramiro
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Old 11th January 2018, 12:41 PM   #655
ekremy18 is offline ekremy18
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Join Date: Feb 2016
Quote:
Originally Posted by Uncle Fedor View Post
Hi

I have finished my amp based on this kit.

The parts I used:
- kit containing 2 pcbs and all parts soldered by myself
- 2 of large aluminium heatsinks
- 200W transformer 220/4*25V
- 4 of capacitors 10000u*50V
- 2 of rectifiers KBPC1010
- speaker protection board kit soldered by myself
- ALPS 27 potentiometer (not fake I hope)
- large 44mm knob
- input and speaker terminals
- some speaker wire
- some microphone wire
- power socket and switch
- 2 little leds with resistors
- plywood cabinet, handmade

Finally, it was worth it. The sound is so clear and so nice that I decided to send to retire my Sony reciever that served to me for 10 years. Goodbye, Sony )

PS: while writing it, I realized my error: I shoud use 2*50AC power. Although, then I should buy other filter capasitors for 80V or 100V (50V ones was on hand). Yet, I like the result. Maybe, one time I make another amp, using right transformer, right cabinet, and add some new features. Likely, it will be another L7.

Click the image to open in full size.
Hi, do you need a seperate preamp with L7 amp? or gain of L7 is already enough for home use, such as lm3886 gain clone?
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Old 11th January 2018, 01:38 PM   #656
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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Join Date: Mar 2007
LJM Audio
2 x 50 vac is way to much. 2 x 50 dc I will recommend.
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Old 11th January 2018, 04:06 PM   #657
carlmart is offline carlmart  Brazil
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Join Date: Mar 2001
Location: Brazil
Certainly so. 2 x 50 VAC would mean +/-68 VDC, which is too much for that output.

What is the speaker's load you have now?
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Old 21st January 2018, 03:12 PM   #658
2ramiro is offline 2ramiro
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Join Date: Feb 2017
Meassured it with a Scopem, with a lower input voltage it works just fine , but it amplifies even a 70 khz signal and gives it to the speaker is that normal ?
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Old 17th February 2018, 10:08 AM   #659
Nanoloop is offline Nanoloop  Hong Kong
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Join Date: Feb 2013
Location: Beyond Infinity
Hi guys - I've been enjoying an L7 for years. Good job! Unfortunately, I turned it on again today and it seems to have lost gain. It still drives 8 ohm cleanly but has lost maybe 20dB or so. Any idea what might have died? Input transistors? The speakers test fine and the source is fine but my investigation hasn't got any further than isolating the issue to the amp. Any ideas?
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Old 18th February 2018, 09:05 AM   #660
daveayerst is offline daveayerst
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Join Date: Nov 2012
Have you measured your power supply voltage/current ?

Quote:
Originally Posted by Nanoloop View Post
Hi guys - I've been enjoying an L7 for years. Good job! Unfortunately, I turned it on again today and it seems to have lost gain. It still drives 8 ohm cleanly but has lost maybe 20dB or so. Any idea what might have died? Input transistors? The speakers test fine and the source is fine but my investigation hasn't got any further than isolating the issue to the amp. Any ideas?
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