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-   -   My first lm3875 (http://www.diyaudio.com/forums/audio-sector/225021-my-first-lm3875.html)

scrazy 5th December 2012 06:18 AM

My first lm3875
 
1 Attachment(s)
The sound is very good!
The dc offset 50mv,40mv seems too high?

chipzahoy 5th December 2012 08:28 AM

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?

scrazy 5th December 2012 09:10 AM

2 Attachment(s)
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...

scrazy 5th December 2012 04:58 PM

chipzahoy:
What do you mean the "magical" resistors ?

chipzahoy 5th December 2012 05:16 PM

The TX2575, use them@Rf and R3!

seanwu 13th June 2016 05:34 AM

Quote:

Originally Posted by chipzahoy (http://www.diyaudio.com/forums/showthread.php?p=3271733#post3271733)
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?

Peter Daniel 14th June 2016 01:39 PM

I was eperimenting with nude Vishays in feedback position but Caddocks MK132 worked better for me.

seanwu 15th June 2016 01:59 AM

Quote:

Originally Posted by Peter Daniel (http://www.diyaudio.com/forums/showthread.php?p=4746171#post4746171)
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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