$175 Class D amp--120 wpc

TrungT · « **Reply #1740 on:** 5 Aug 2010, 05:41 am »

Paul
I'm glad you got the Class D amp running.
Please let me know if I can help.

Paul B · « **Reply #1741 on:** 5 Aug 2010, 10:26 am »

Just a quick update. I fixed the buffer - there was a loose wire on the RCA board.

The SDS258 amp and Dodd buffer are running in now. It is sounding great and a big step up from my previous amp. I can't wait to hear it in a few weeks. I have a nice Amperex tube on the way as well.

Thanks to all for your help with advice, pictures etc.

Paul

TrungT · « **Reply #1742 on:** 5 Aug 2010, 11:39 am »

Paul

Which's Amperex ?

Paul B · « **Reply #1743 on:** 5 Aug 2010, 11:59 am »

Amperex 6DJ8, Orange globe logo

I know very little about tubes. this one had positive comments on Joe's tube lore.

HT cOz · « **Reply #1744 on:** 5 Aug 2010, 01:49 pm »

I created a small table of the different boards with the official printed specs. I can also work up an unofficial spec sheet if people will PM details of conversations with Tom regarding unpublished performance.

Kind Regards,
Robert

Barry_NJ · « **Reply #1745 on:** 5 Aug 2010, 02:28 pm »

Quote from: HT cOz on 5 Aug 2010, 01:49 pm

I created a small table of the different boards with the official printed specs. I can also work up an unofficial spec sheet if people will PM details of conversations with Tom regarding unpublished performance.

Kind Regards,
Robert

That's awesome Robert, thanks!!!

jtsnead · « **Reply #1746 on:** 5 Aug 2010, 10:25 pm »

I have a question why does the SDS254 put out 500w bridged?
I thought the power usually doubles when amps are bridged.

soundnoob · « **Reply #1747 on:** 6 Aug 2010, 04:53 pm »

Quote from: Barry_NJ on 5 Aug 2010, 02:28 pm

That's awesome Robert, thanks!!!

Agreed! great post

steve k · « **Reply #1748 on:** 6 Aug 2010, 07:52 pm »

I just heard from Tom at Class D Audio that the review of one of his amps in Affordable Audio is due out next week. Film at 11.
steve

roymail · « **Reply #1749 on:** 6 Aug 2010, 09:47 pm »

Quote from: steve k on 6 Aug 2010, 07:52 pm

I just heard from Tom at Class D Audio that the review of one of his amps in Affordable Audio is due out next week. Film at 11.
steve

That's what they said last month, but I hope you're right. Do you know which boards will be reviewed?

Steve, thanks for the update!

steve k · « **Reply #1750 on:** 6 Aug 2010, 11:10 pm »

I didn't ask Tom. I thought it would be better to be surprised.
steve

boomer68 · « **Reply #1751 on:** 7 Aug 2010, 10:36 pm »

I just finished reading all 88 or so pages of this thread,and even thou i dont need another amp im gitty like a school girl about doing a class d amp and custom making a box or platform to display
the amp. I love that a company can make it so simple to do!

Wallacefl · « **Reply #1752 on:** 8 Aug 2010, 02:28 pm »

I am considering one of the Class D kits...but they are kind of silent on dimensions...will any of their stereo kits fit in an old Dynaco ST-120 chassis(13x10x4)...thanks

ebag4 · « **Reply #1753 on:** 8 Aug 2010, 03:33 pm »

Quote from: Wallacefl on 8 Aug 2010, 02:28 pm

I am considering one of the Class D kits...but they are kind of silent on dimensions...will any of their stereo kits fit in an old Dynaco ST-120 chassis(13x10x4)...thanks

If you go into the individual amp and power supply descriptions on the ClassD site the measurements are indicated.

Best,
Ed

Feanor · « **Reply #1754 on:** 9 Aug 2010, 04:03 pm »

Hi, folks,

I'm just finishing up a SDS-258 contruction -- nothing fancy: no mods, just a plug and play. However a question: can I by-pass the supplied volume pots?

Tom at Class D Audio says, "Yes, you have to have the gain pots installed… you’ll like them, use them. It will let you adjust the gain of the amp to match the sweet spot of your preamp… usually between 9:00 and 2:00 position." He gave no further explanation.

Still, I think I'd rather by-pass them if possible. Can this be done easily, e.g. by jumping a couple of the header pins? If so, which ones? Or other simple options?

Your advice will be appreciated!

srb · « **Reply #1755 on:** 9 Aug 2010, 04:35 pm »

Quote from: Feanor on 9 Aug 2010, 04:03 pm

I'm just finishing up a SDS-258 contruction -- nothing fancy: no mods, just a plug and play. However a question: can I by-pass the supplied volume pots?

Because these are gain pots and not actually volume controls, are they not just adjusting the gain multiplier of the amplifier, and are not actually part of the signal path?

Steve

Feanor · « **Reply #1756 on:** 9 Aug 2010, 07:18 pm »

Quote from: srb on 9 Aug 2010, 04:35 pm

Because these are gain pots and not actually volume controls, are they not just adjusting the gain multiplier of the amplifier, and are not actually part of the signal path?

Steve

The gain vs. volume distinction is unfortunately lost on me, an electronics ignoramous. Note that there is, at the moment, no user manual for the SDS series amps.

roymail · « **Reply #1757 on:** 9 Aug 2010, 07:21 pm »

Quote from: Feanor on 9 Aug 2010, 07:18 pm

The gain vs. volume distinction is unfortunately lost on me, an electronics ignoramous. Note that there is, at the moment, no user manual for the SDS series amps.

I'm not sure you will actually gain much if anything. Personally, I like the ability to fine tune any amp.

jtwrace · « **Reply #1758 on:** 9 Aug 2010, 07:27 pm »

Quote from: srb on 9 Aug 2010, 04:35 pm

Because these are gain pots and not actually volume controls, are they not just adjusting the gain multiplier of the amplifier, and are not actually part of the signal path?

Steve

Steve,

You're correct! They are part of the signal path....I don't understand why one wouldn't want to use them as they are a very helpful add on to the Super D series.

just my opinion though.

srb · « **Reply #1759 on:** 9 Aug 2010, 07:32 pm »

Quote from: jtwrace on 9 Aug 2010, 07:27 pm

Steve,

You're correct! They are part of the signal path....

Okay Jason, don't try to confuse me! Did you leave out the NOT?

Steve