Author Topic: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2  (Read 8319 times)

Offline rollo

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #15 on: March 07, 2018, 08:10:12 AM »
Dave yes we miss Gary as well. For the short time I knew him it was a blessing. Now for us with ten thumbs how can we hear this wonder ?  :mrgreen:

charles
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Offline P.I.

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #16 on: March 07, 2018, 01:22:15 PM »
When Danny is done it will start making the rounds.  I think Danny will be sending it to jparkhur and from there, I dunno.

I'm going to email Jon in a bit and we'll try to figure this all out.

 8)
"A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

Offline shadowlight

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #17 on: March 07, 2018, 01:52:10 PM »
Dave yes we miss Gary as well. For the short time I knew him it was a blessing. Now for us with ten thumbs how can we hear this wonder ?  :mrgreen:

charles

Charles,
I have one.  Let me know if you want to listen to it and we can arrange something.

Offline Nick B

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #18 on: March 07, 2018, 02:16:10 PM »
When Danny is done it will start making the rounds.  I think Danny will be sending it to jparkhur and from there, I dunno.

I'm going to email Jon in a bit and we'll try to figure this all out.

 8)

If there’s gonna be a tour, pls count me in. I’d love to hear it!
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Offline tmazz

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #19 on: March 07, 2018, 04:30:58 PM »
Hey Nick, congrats on passing the 1,000 post mark.   :X
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Offline Nick B

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #20 on: March 07, 2018, 06:48:44 PM »
Hey Nick, congrats on passing the 1,000 post mark.   :X

Thanks, Tom. I had no idea I could be this “prolific” at my age..... 😳
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Offline dBe

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #21 on: March 07, 2018, 08:10:42 PM »
I'll be building another 7297 with some different resistor types than the BOM.  I really like Takman and PRP resistors and I'll be seeing what different colors the amp is capable of reproducing.  I think it can have different personalities for different applications... not vastly different but nuanced.

Great amp project.

Offline Folsom

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #22 on: March 08, 2018, 04:32:16 PM »
The type of resistors will have a small affect on the power coming in. The mute/stby resistors don't do anything. It's the ones in the KMR section that can differ. For example Dale RN lean 2HD and PRP lean 3HD, so it may change the sound a little. Takman will be specifically trying induce some noise, but it won't be much at such low voltages.

Probably the easiest way to really change the sound... swap in MUR860 diodes. They really can give you a tube sound, like the lush type sound. They are not as accurate or as dynamic, but they might be exactly what some people want.

Offline P.I.

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #23 on: March 09, 2018, 02:04:07 PM »
The type of resistors will have a small affect on the power coming in. The mute/stby resistors don't do anything. It's the ones in the KMR section that can differ. For example Dale RN lean 2HD and PRP lean 3HD, so it may change the sound a little. Takman will be specifically trying induce some noise, but it won't be much at such low voltages.

Probably the easiest way to really change the sound... swap in MUR860 diodes. They really can give you a tube sound, like the lush type sound. They are not as accurate or as dynamic, but they might be exactly what some people want.
Thanks for the tip, Jeremy.  I plan on trying the Takman carbon films to do exactly that.  It's that indescribable "flavor" thing.  I'm just curious as to how much tone (noise) shaping can be done.  I'll be mounting them on headers until I figure out where they live.  Specifically I'm trying to voice the amp (bad idea, but I'm curious) for the Dayton PS220 speakers that I'm working with.  They need a little help in the warmer department.  That is one of the reasons they sound so good with tube amps.

I'm also going to try some Fairchild Stealth diodes.  Same idea.

Great platform for knowledge, fun and just good listening.  Kudos!
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Offline Folsom

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #24 on: March 09, 2018, 03:00:51 PM »
What does your OB look like? Measurements and placement of the speaker?

DO they have a crossover?
« Last Edit: March 09, 2018, 03:02:29 PM by Folsom »

Offline dBe

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #25 on: March 09, 2018, 08:13:31 PM »
What does your OB look like? Measurements and placement of the speaker?

DO they have a crossover?
Pictures to come soon.  They are being changed from ugly OB on the PS220 to a 200 Hz transmission ftp://vline upper enclosure (better looking per the wife) to mate with my GR subs. They use the crossover in the plate amps I have been using and I am changing them to vertical bi-wire for my Folsom amps with some ambient tweeters on the upper backs to help deal with the beaming inherent with a single driver.  When I sent my 7297 amp to Danny Richie I figured it was time to do el destructo I wanted to do with my speakers.  I want a small, tidy speaker to make music in my room.

I'm using VST plugins to deal with the PS220 3.6kHz bump and I will be searching for a differen
handle frequency compensation.





















« Last Edit: March 09, 2018, 08:21:08 PM by dBe »

Offline Folsom

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #26 on: March 10, 2018, 10:15:17 PM »
The problem with OB's and bookshleves is often that they place the driver in the resonate peaks. A TL will help, tune it to FS quarter pipe. It would probably take a massive series cap to work for what I suggest to flesh out the midrange better - like some huge snapcaps back to back. Hopefully some dampening behind the driver will work. I dont like stuffing in the line, usually sounds bad.

Offline dBe

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Re: Folsom DIY7297 & Antipole; LOFI, DCS1 & DCS2
« Reply #27 on: March 13, 2018, 11:07:21 PM »
The problem with OB's and bookshleves is often that they place the driver in the resonate peaks. A TL will help, tune it to FS quarter pipe. It would probably take a massive series cap to work for what I suggest to flesh out the midrange better - like some huge snapcaps back to back. Hopefully some dampening behind the driver will work. I dont like stuffing in the line, usually sounds bad.
I shudder at speakers that place drivers at wavelength resonance nodes floor to ceiling.  I normally try to place the LF driver at one of the fifths or sevenths of the floor to ceiling distance.  Bass is always smoother.  BTW, I have rethought the enclosure for the PS220.  It will be a folded QWTP force tuned to 40Hz.  I'll place the subs where they sound best and probably move to a swarm.  Just makes sense.

I'll try a biased cap alignment when I get the suckers built and broken in.  Actually the PS220s have 2 weeks of run in with a Variac doing 5mm p-p while we were on Christmas vacation and they sound really good now.