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Ovation SK-M Preamp Recreation

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arumako
Posted 2025-04-19 8:47 PM (#560906 - in reply to #560899)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
October 2012
Posts: 1060

Location: Yokohama, Japan
moody, p.i. - 2025-04-19 1:29 AM

I read thru this thread as it's facinating. Sadly, it's not in English and I didn't understand any of it. But it's facinating.........

Facinating! That's exactly what I was trying to say! LOL!
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Love O Fair
Posted 2025-04-19 10:08 PM (#560908 - in reply to #560743)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
February 2016
Posts: 1835

Location: When??		Wait.. I always thought that facinating is what Mediterranean Fruit Flies did beneath the moist chunk of scrap wood next to the tractor shed. Am I missing something?
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seesquare
Posted 2025-04-20 7:24 AM (#560912 - in reply to #560743)
Subject: Re: Ovation SK-M Preamp Recreation


Joined:
November 2002
Posts: 3637

Location: Pacific Northwest Inland Empire		Facinate 10mg/10mg/2.5mg Tablet is a combination medicine used in the treatment of nausea or vomiting during pregnancy. It blocks signals to reach the brain that trigger the feeling of nausea or vomiting.
Thanks Paul, high praise, indeed!
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seesquare
Posted 2025-04-21 9:46 AM (#560913 - in reply to #560743)
Subject: RE: Ovation SK-M Preamp Recreation


Joined:
November 2002
Posts: 3637

Location: Pacific Northwest Inland Empire		Soldered and installed. Only missed one connection- the source lead on the transistor. Made some difference, eh wot? And, sorry, I forgot to shoot a photo of the board in the box before it was mounted in the bowl. It works great and the volume and tone roll off very nicely. It really gives that shallower bowl a lot of power, though it seems a bit darker than when unamplified. I believe I am finished, though I may mount the battery to the proper hole in the bowl, eventually. It's currently just attached to the side of the circuit box enclosure.
So, the reanimation is complete. If anyone else is enterprising to construct one of these critters, be assured it is indeed feasible and very satisfying.

Edited by seesquare 2025-04-21 10:06 AM




(Ovation SKM soldered assembly 04-19-2025 #2- smaller image.jpg)



(1528 SKM preamp in bowl- smaller image.jpg)



(1528 side view with SKM preamp- smaller image 2.jpg)



(Ovation SKM soldered assembly 04-19-2025- smaller image 2.jpg)



Attachments
----------------
Attachments Ovation SKM soldered assembly 04-19-2025 #2- smaller image.jpg (69KB - 0 downloads)
Attachments 1528 SKM preamp in bowl- smaller image.jpg (78KB - 0 downloads)
Attachments 1528 side view with SKM preamp- smaller image 2.jpg (72KB - 0 downloads)
Attachments Ovation SKM soldered assembly 04-19-2025- smaller image 2.jpg (53KB - 0 downloads)
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DanSavage
Posted 2025-04-21 5:28 PM (#560914 - in reply to #560908)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
June 2012
Posts: 2330

Location: Pueblo West, CO
Love O Fair - 2025-04-19 8:08 PM

Wait.. I always thought that facinating is what Mediterranean Fruit Flies did beneath the moist chunk of scrap wood next to the tractor shed. Am I missing something?


Yes. It was a garden shed, not a tractor shed.

Edited by DanSavage 2025-04-21 5:29 PM
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DanSavage
Posted 2025-04-21 5:31 PM (#560915 - in reply to #560743)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
June 2012
Posts: 2330

Location: Pueblo West, CO		Very cool.

I always liked the tone of the analog pups over that of the later digital pups.

I may have to build one or two for my acoustic-only O's.
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Love O Fair
Posted 2025-04-22 4:47 PM (#560916 - in reply to #560743)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
February 2016
Posts: 1835

Location: When??		Chris-- always a treat to see the result of what takes place your lab. Scary, sometimes.. but still a treat.

Dan-- I just now noticed your new location. A bit dryer air over there, eh?
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arumako
Posted 2025-04-22 8:56 PM (#560917 - in reply to #560913)
Subject: RE: Ovation SK-M Preamp Recreation



Joined:
October 2012
Posts: 1060

Location: Yokohama, Japan
seesquare - 2025-04-20 11:46 PM

If anyone else is enterprising to construct one of these critters, be assured it is indeed feasible and very satisfying.

Whoa! Okay, so I've passed the "fascinating" phase, and went right into "enterprising" phase, seesquare! Wait, I should first say "Congratulations" shouldn't I?

Pretty sure I can get the parts, and with some help from AI, I think I can read the schematics (kinda), soldering is within reach too; however, bread board arrangement throws me right back into "fascinating" mode. Do you have a high-res version of the "Ovation SK-M preamp breadboard 1.jpg" pic? I definitely want to build one of these and put it in my 1115 (assuming everything works out - knock on wood!).

Congratulations and thanks for the inspiration!
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arumako
Posted 2025-04-22 8:56 PM (#560918 - in reply to #560913)
Subject: RE: Ovation SK-M Preamp Recreation



Joined:
October 2012
Posts: 1060

Location: Yokohama, Japan
seesquare - 2025-04-20 11:46 PM

If anyone else is enterprising to construct one of these critters, be assured it is indeed feasible and very satisfying.

Whoa! Okay, so I've passed the "fascinating" phase, and went right into "enterprising" phase, seesquare! Wait, I should first say "Congratulations" shouldn't I?

Pretty sure I can get the parts, and with some help from AI, I think I can read the schematics (kinda), soldering is within reach too; however, bread board arrangement throws me right back into "fascinating" mode. Do you have a high-res version of the "Ovation SK-M preamp breadboard 1.jpg" pic? I definitely want to build one of these and put it in my 1115 (assuming everything works out - knock on wood!).

Congratulations and thanks for the inspiration!
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seesquare
Posted 2025-04-23 4:59 PM (#560920 - in reply to #560743)
Subject: Re: Ovation SK-M Preamp Recreation


Joined:
November 2002
Posts: 3637

Location: Pacific Northwest Inland Empire		Okay, Ken. I'm not sure what high-res requires, but I am posting more of my worksheets to specify the placement of the electronic components. Hopefully, if you know your way around a breadboard, the diagrams will tell you where I placed everything and how the circuit connections are laid out. The photo of the assembled breadboard is so congested, it's impossible to see the circuitry clearly. I will try to answer any questions you have, anyway.



(SKM breadboard layout- OFC size.jpg)



(SKM breadboard component legend- OFC size.jpg)



(SKM perfboard placement- final assembly layout- OFC size.jpg)



Attachments
----------------
Attachments SKM breadboard layout- OFC size.jpg (99KB - 0 downloads)
Attachments SKM breadboard component legend- OFC size.jpg (97KB - 0 downloads)
Attachments SKM perfboard placement- final assembly layout- OFC size.jpg (91KB - 0 downloads)
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arumako
Posted 2025-04-23 10:33 PM (#560922 - in reply to #560743)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
October 2012
Posts: 1060

Location: Yokohama, Japan		Hey, thanks seesquare! That was quick. I'm gonna print these out and start prepping notes and order the parts that I need. Will probably do this in conjunction with my OP24 electrolytic capacitor replacement for my 1868. Very cool! Thanks again! Gotta love the BFLG!
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DanSavage
Posted 2025-04-25 11:15 AM (#560926 - in reply to #560916)
Subject: Re: Ovation SK-M Preamp Recreation



Joined:
June 2012
Posts: 2330

Location: Pueblo West, CO
Love O Fair - 2025-04-22 2:47 PM

Dan-- I just now noticed your new location. A bit dryer air over there, eh?


Yes. This part of the state is high desert, no pun intended.
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