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Old 24th August 2006, 05:59 AM   #1411
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The voltages in data sheet are always after rectification.

To convert DC to AC on secondaries, devide it by 1.4
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Old 25th August 2006, 01:56 AM   #1412
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Thanks a lot for the info, it really helps a ton!
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Old 31st August 2006, 11:45 AM   #1413
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Hi Peter,

I'm still getting some problems with my LM3875 premium kit . I'm using 2 toroids (300VA, 2x22v) and 2 rectifiers and the sound is way to low. Mesuring between V+ and PG+ and V- and PG- I get 30v. I've checked every wire, every solder joint and I can't figure out what's happening . My speakers are 90dB and I used to have a Sonic Impact T-amp and it drove them very well.
Can you post some pics or more info for newbies like me to check and see how you do it?

Thanks.

PS. the sound is quite good, warm and detailed, but very low. I'm using it in power configuration connected to a Ibook and a Marantz A/V reciever.
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Old 2nd September 2006, 06:56 PM   #1414
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Hi again,

Still with the same problem . I've introduced a 50k pot in the game and I have to turn it to maximum to get sound at a reasonable volume, but then I can hear some very audible interference on the speakers. The output offset is around 25mv with source connected. I need some help please .

Paulo
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Old 2nd September 2006, 08:19 PM   #1415
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Paulo, can you measure the resistor values and post what is in each position on the pcb? It could be that the gain is too low. I doubt that you switched the 22k and 220R caddocks, because then things would really be messed up, but maybe the 22k caddocks or 680R rikens are the incorrect values.
EDIT: you could also look at the caddocks, the resistance is printed on the package, and look at the rikens for the band pattern, this website will show you how to read it to get the resistance:
http://www.reprise.com/host/circuits...colorcodes.asp
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Old 2nd September 2006, 08:31 PM   #1416
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The pictures of assembled boards can be found here: http://www.diyaudio.com/forums/showt...425#post584425 I was using different caps than supplied in a kit though.

The amp has quite a high gain, so you shouldn't have problems with volume. What source are you using?
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Old 2nd September 2006, 09:14 PM   #1417
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Default pardon me

It could be a grounds issue. try connecting rca out to pot ground and rca ground to boards signal ground. Worked for me because wiring the gainclone the same way as the SI threads suggested induced some the issues you stated.

Chuck
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Old 3rd September 2006, 12:41 AM   #1418
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OK,

I did a mistake with the Caddocks . I'm such a newbie!!!
Peter, can you send me new Caddocks ( I broke one of the 22k ), 2 of each, and payment details?

Paulo
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Old 4th September 2006, 01:05 PM   #1419
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Peter,

Thought I'd share a pic of my non-typical use of your rectifier boards. Now you can say you do tube amp boards.

Click the image to open in full size.
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Old 9th September 2006, 08:35 PM   #1420
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Peter Any idea when the remote volume pot will be ready ? I would really like to buy one. Just a simple volume up down and mute.
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