KSA50 AMP(New production Live in...)

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Special message for GXCNABIN

Dear Abin

1. Try to ask your post office for registered post

They will give tracking number so we can
track them, same as EMS
is there any available registered post service ?
not the EMS service, it is too expensive to diy

2. Offer your UPC 1237 To new buyer
Those thing hard to find here

3. Offer Your Diode Bridge, 1n4148, zener 27v 5w
& Omron Relay too. Sometime hard to source 1 by 1

Thank you

Hi! Pocoyo.
I may mail the thing through the post office to you, that is indeed quite cheap, but possible to take 30 days to mail for you.
You said these electronic primary device, some people want?
My here only then I sweep, will attain possibly many in ......😀
 
Hello Abin,
your KSA-50 build looks very good. I particularly like the chassis. Do you intend putting the preamplifier in the same chassis ? The chassis front panel has input selection and volume control.

For many people 4 weeks for delivery is acceptable, especially if the price difference is significant.

您好 Abin,
您KSA - 50建造看起来非常好。我特别喜欢的机箱。你是否打算把在同一机箱中的前置放大器?该机箱前面板有输入选择和音量控制。

4周交货许多人是可以接受的,尤其是如果价格差异显着。

Regards.
firestorm, 中

Note to moderators, I have included the chinese version to facilitate communications. They both have the same meanings.
 
sorry for the long explanation 🙂

Left of the vertically standing units is a powersupply with a 500VA 25 0 25 toroidal, with 40000uF per rail supplying +-35V to 5 x lm3886 chipamps. Each of the vertical units contains one lm3886 chipamp running the 5 channels of my sound system.

The bigger enclosure to the right contains 6 x lm3886's + linkwitz transform all forming one single channel with another 500va transformer inside tested to supply 300W into 4ohms vir my subwoofer (2 x 12" sealed enclosure i built).

thus combined forms 6 amplifiers for my 5.1 system.

During any normal day only 2 of the 5 channel lm3886 chips works mostly for music. recently I started to also use the subwoofer for normal stereo use with cuttoff at 80hz. This is all fed from a single rotel rsp 985 surround processor. Which is fed from the optical out from my media centre pc.

About 2m to the left is my turntable. For the forseeable future i see this new amp doing duty for the turntable only ,but using the ksa 50 with 2 of the 5 gainclones in a biamped system is very probable in the long run if I get speakers to support this.

Hi Tangmonster,
very impressive, where do you plan to use the KSA-50 ? I assume for the 2 front channels ? I am considering a bi-amp KSA-50. The tweeter channel will be run at a much lower bias current to lessen the heat output.

Do you intend to build a new power supply for you KSA-50 ?

Regards
fs
 
Hello Abin,
your KSA-50 build looks very good. I particularly like the chassis. Do you intend putting the preamplifier in the same chassis ? The chassis front panel has input selection and volume control.

For many people 4 weeks for delivery is acceptable, especially if the price difference is significant.

您好 Abin,
您KSA - 50建造看起来非常好。我特别喜欢的机箱。你是否打算把在同一机箱中的前置放大器?该机箱前面板有输入选择和音量控制。

4周交货许多人是可以接受的,尤其是如果价格差异显着。

Regards.
firestorm, 中

Note to moderators, I have included the chinese version to facilitate communications. They both have the same meanings.

Thanks!

Thanks you! For me,has translated Chinese specially.
What I install now tests the edition, only uses in testing.
Perfect version's assembly, That cabinet is only then attractive.
 
Hi Tangmonster,
very impressive, where do you plan to use the KSA-50 ? I assume for the 2 front channels ? I am considering a bi-amp KSA-50. The tweeter channel will be run at a much lower bias current to lessen the heat output.

Do you intend to build a new power supply for you KSA-50 ?

Regards
fs

Yes i will use the ksa 50 for the 2 front channels when playing lp's ,and the lm3886's for probably everything else. so my next project/purchase will be a speaker switch 🙂

Yes I am busy designing an enclosure for the ksa50. I have 4 x 68000uF 50V capacitors , i want to experiment and see if 2 will be enough with one transformer or if i should use two transformers with all 4 capacitors. Since mine will only run on +-35Vdc and my main speakers are rated for 92db/w/m and 8ohms one 600 or 750va should be overkill enough.

So at this stage I am torn between 1 x 500va / 2 x 300va / 2 x 500va. the last one will obviously be the best , but if i want to spend this much money on the power supply is still a question since a 500va is about $100 here.
 
Hi! Pocoyo.
Has a look at me is the HIFI-END level Pre-amplifier which “XX” the well-known magazine (55th anniversary commemorative edition) designs.
PCB size:240*210MM
Amounted to 30% silver.😀
 

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sorry for the long explanation 🙂

Left of the vertically standing units is a powersupply with a 500VA 25 0 25 toroidal, with 40000uF per rail supplying +-35V to 5 x lm3886 chipamps. Each of the vertical units contains one lm3886 chipamp running the 5 channels of my sound system.

Sorry for off topic. How is the PSU connect to the amps? Can you post schematic of PSU and grounding for amps? Are amps gnd connect to PSU gnd? Thanks
 
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