Folsom's great little 7297 Chip Amp

Audioillness · « **Reply #740 on:** 6 Dec 2016, 07:01 pm »

Hi Folsom,
I've read this thread avidly, and I too would love have the opportunity to build one of your amps. Do you think you might offer pcb's again at some point?
Dave

Folsom · « **Reply #741 on:** 8 Dec 2016, 11:40 pm »

As a matter of fact for Christmas I've got a few from a test run. There's 6 of them and they go to whomever wants to also get Antipole boards with them. They don't have provisions on the bottom for MKP1837 caps. On the top in order to use the PHE426 and MKP1837 you'd have to use some wire. They however are made to fit a cap such as Jantzen's 1.5uf; which is a great option.

Folsom · « **Reply #742 on:** 10 Dec 2016, 12:49 am »

I know some of you want boards, you just haven't looked yet.

Vlad · « **Reply #743 on:** 10 Dec 2016, 02:33 am »

I am interested in the amp/PSU boards (one set).

Thanks,
Vladimir

Tortorgia · « **Reply #744 on:** 10 Dec 2016, 12:22 pm »

I would like a set please

Audioillness · « **Reply #745 on:** 10 Dec 2016, 01:13 pm »

I would like to purchase 1x amp, 1x psu boards please.
Dave

drmike · « **Reply #746 on:** 12 Dec 2016, 08:47 pm »

i have one of each for sale.
thanks,
drmike

Folsom · « **Reply #747 on:** 12 Dec 2016, 08:51 pm »

You want, or are selling?

drmike · « **Reply #748 on:** 12 Dec 2016, 09:02 pm »

selling

Folsom · « **Reply #749 on:** 12 Dec 2016, 09:07 pm »

Ah ok, that's good. I know there's more people that want boards, they just need to see it. When I ran out lots of people still asked to buy them.

tubesguy2 · « **Reply #750 on:** 13 Dec 2016, 03:03 pm »

I also have a set of boards, along with most (all?) of the parts necessary, including the recommended Hammond power transformer and, of course, the 7297s. All parts are from Mouser or Digikey. PM me if you're interested in the package. (I assume I can also provide you with a copy of the original documentation, which is Folsom's intellectual property.)

Folsom · « **Reply #751 on:** 13 Dec 2016, 06:40 pm »

Yes it's ok to forward that information.

Vlad · « **Reply #752 on:** 14 Dec 2016, 02:06 am »

Question to Lacro: where did you buy the LL2728 transformer? It is not listed on the Lundalh site?

Thanks,
Vlad

lacro · « **Reply #753 on:** 14 Dec 2016, 05:34 pm »

Quote from: Vlad on 14 Dec 2016, 02:06 am

Question to Lacro: where did you buy the LL2728 transformer? It is not listed on the Lundalh site?

Thanks,
Vlad

It's not listed because it was originally made for an OEM. It's really overkill for my amp, but it was a gift so I used it. Lundahl transformers in the US can be bought from: http://www.kandkaudio.com/products/

Letitroll98 · « **Reply #754 on:** 15 Dec 2016, 05:42 am »

A couple of posts late, but we do want to pm Folsom about buying any boards instead of posting here. Don't want to get him in trouble with site policies, he's been so good up till now.

And for individuals selling their boards, it's best to post an ad in the trading post and link to it here. No biggie with what's been posted so far, just going forward we want to stay inside the lines.

Odal3 · « **Reply #755 on:** 15 Dec 2016, 06:50 am »

It took me a while but I finally got in my mouser order for my first antipole build + my 2nd 7297. Hoping to get get it quickly despite the backorders for a few parts so I will have fun project over the Holidays. Looking forward to it!

lacro · « **Reply #756 on:** 15 Dec 2016, 02:18 pm »

Quote from: Odal3 on 15 Dec 2016, 06:50 am

It took me a while but I finally got in my mouser order for my first antipole build + my 2nd 7297. Hoping to get get it quickly despite the backorders for a few parts so I will have fun project over the Holidays. Looking forward to it!

Are you going to try different (boutique) input caps on the amp?

Odal3 · « **Reply #757 on:** 15 Dec 2016, 04:56 pm »

I thought about it, but then I couldn't decide so I kept it per the original build spec.

I also noticed there were 1 or 2 minor changes in the BOM since my original build so I'm curious about that too.

Tomy2Tone · « **Reply #758 on:** 23 Dec 2016, 01:51 pm »

Anybody here have one of these amps they built laying around they would like to sell? I pm'd Folsom but thought I'd ask here as well to see if anybody has a decent one they're not using. This would be for desktop use so nothing fancy.

skrstc · « **Reply #759 on:** 11 Jan 2017, 09:14 pm »

Did anyone tried other types and values of input capacitors?