New Gainclone Prototype

mdlover · 13th June 2003, 07:51 PM

Hi All,

I'm new to this forum and have read quite a number of posts in this forum.

I have just completed a gainclone prototype using the LM1875 yesterday. This little baby working in inverting mode and the first impression to me is clean and tight bass, sweet highs but the mids is a bit cool (may be for me only

).

Will let it burn in for some more time. Pics will be ready soon.

The result is quite encouraging and I'm ready to built the LM3875 clone now.

cheers

mdlover · 14th June 2003, 10:53 AM

this is my new little gainclone prototype

the LM1875 was mounted on a heatsink for Pentium 4.

Nuuk · 14th June 2003, 12:21 PM

Welcome to the club mdlover!

Quote:

This little baby working in inverting mode and the first impression to me is clean and tight bass, sweet highs but the mids is a bit cool (may be for me only ).

Give it a bit longer to burn in. But what type of resistors are you using. You could do try a carbon film for the input resistor!

mdlover · 14th June 2003, 12:30 PM

Hi,

The resistors in the signal path are all Holco. The one you see with color rings is for the LED and is removed already.

Coz I just got the Holco on hand and the feedback is 200K instead of 220K but the gain drop is no harm.

Since this is a prototype, all components are just from my toolbox. I have prepared the LM3875, Riken, Blackgate and ......

ps, is there a big difference between different input coupling caps? like wima, kimber cap and the blackgate

cheers

elizard · 14th June 2003, 01:17 PM

yeah, welcome to the gainclone cult

analog_sa · 14th June 2003, 02:38 PM

mdlover

What you describe is in my experience the sonic signatire of the 1875. The 3875 has better bass and warmer mids and generally calmer sound. The Wima caps and spring-loaded terminals also don't help much.

cheers
peter

Nuuk · 14th June 2003, 04:23 PM

Quote:

ps, is there a big difference between different input coupling caps? like wima, kimber cap and the blackgate

Not sure about BIG difference but there is a difference. To save you reading all the posts here (although it is very elightening to do so) I would say that most GC builders prefer either a Black Gate (N or better) or a polypropyline (or nothing at all if there is no DC from the source).

mdlover · 14th June 2003, 05:01 PM

Quote:

Originally posted by elizard
yeah, welcome to the gainclone cult

yeah, the new gc using 3875 is in progress now....

but after reading Perter Daniel's post, I'm jealous about his wonderful housing for the gc.

mdlover · 14th June 2003, 05:03 PM

Quote:

Originally posted by analog_sa
mdlover

What you describe is in my experience the sonic signatire of the 1875. The 3875 has better bass and warmer mids and generally calmer sound. The Wima caps and spring-loaded terminals also don't help much.

cheers
peter

will compare the sound soon, the new gc using 3875 is in progress

cheers

li_gangyi · 25th June 2003, 05:58 AM

Yo~! Guys...any one tried Mylar caps?? they are called polester caps as well...cheap though....

13th June 2003, 07:51 PM	#1
mdlover diyAudio Member Join Date: Jun 2003 Location: HK	New Gainclone Prototype Hi All, I'm new to this forum and have read quite a number of posts in this forum. I have just completed a gainclone prototype using the LM1875 yesterday. This little baby working in inverting mode and the first impression to me is clean and tight bass, sweet highs but the mids is a bit cool (may be for me only ). Will let it burn in for some more time. Pics will be ready soon. The result is quite encouraging and I'm ready to built the LM3875 clone now. cheers

25th June 2003, 05:58 AM	#10
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	Yo~! Guys...any one tried Mylar caps?? they are called polester caps as well...cheap though.... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

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14th June 2003, 12:30 PM	#4
mdlover diyAudio Member Join Date: Jun 2003 Location: HK	Hi, The resistors in the signal path are all Holco. The one you see with color rings is for the LED and is removed already. Coz I just got the Holco on hand and the feedback is 200K instead of 220K but the gain drop is no harm. Since this is a prototype, all components are just from my toolbox. I have prepared the LM3875, Riken, Blackgate and ...... ps, is there a big difference between different input coupling caps? like wima, kimber cap and the blackgate cheers

14th June 2003, 01:17 PM	#5
elizard diyAudio Member Join Date: Mar 2003 Location: Winnipeg, MB	yeah, welcome to the gainclone cult

14th June 2003, 02:38 PM	#6
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	mdlover What you describe is in my experience the sonic signatire of the 1875. The 3875 has better bass and warmer mids and generally calmer sound. The Wima caps and spring-loaded terminals also don't help much. cheers peter

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