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Old 5th December 2012, 06:18 AM   #1
scrazy is offline scrazy  Taiwan
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Default My first lm3875

The sound is very good!
The dc offset 50mv,40mv seems too high?
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Old 5th December 2012, 08:28 AM   #2
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Nice build, I like those chassis.

Not at all. Those values are well within the safe range.

Edit: Do you plan on picking up the "magical" resistors as recommended?

Last edited by chipzahoy; 5th December 2012 at 08:43 AM.
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Old 5th December 2012, 09:10 AM   #3
scrazy is offline scrazy  Taiwan
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more pictures...
This is my test set, I'll testing Cin when my caps received , and rewire the connection , add a copper plate at the bottom.
I use Cin because : http://www.rexdiy.com/smf2/index.php?topic=432.0

The toroid is from Tamela 18v 225va.
There're some strange thing, when lm3875 turn off,I turn on the preamp, there're some loud noise from the speaker, after about 6 secs ,then dead silent.
So I turn on lm3875, and all works fine.
no idea...
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File Type: jpg 2012-12-03 16.00.22.jpg (457.6 KB, 386 views)

Last edited by scrazy; 5th December 2012 at 09:21 AM.
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Old 5th December 2012, 04:58 PM   #4
scrazy is offline scrazy  Taiwan
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chipzahoy:
What do you mean the "magical" resistors ?
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Old 5th December 2012, 05:16 PM   #5
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The TX2575, use them@Rf and R3!
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Old 13th June 2016, 05:34 AM   #6
seanwu is offline seanwu  Taiwan
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Quote:
Originally Posted by chipzahoy View Post
The TX2575, use them@Rf and R3!
Just noticed the Gainclone and want to build one myself.

According to the schematics, there are 4 resistors needed (or 3, if not install the R1).

I read some Chinese blog and the author mentioned that the TX2575 can be used on Rf and get sound quality boost .

Since the TX2575 is very expensive. I was wondering whether I can use TX2575 on Rf only? Or it must be used on R3 and Rf to get the benefit?

If I decide to spend more money, use TX2575 on R2 / R3 / Rf can get good result or just throw my money into toilet?

Last edited by seanwu; 13th June 2016 at 05:50 AM. Reason: typo
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Old 14th June 2016, 01:39 PM   #7
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I was eperimenting with nude Vishays in feedback position but Caddocks MK132 worked better for me.
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Old 15th June 2016, 01:59 AM   #8
seanwu is offline seanwu  Taiwan
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I was eperimenting with nude Vishays in feedback position but Caddocks MK132 worked better for me.
Got it. Thanks for the advise.
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