Triad Magnetics SP-118 Inductor

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Bombacaototal
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Triad Magnetics SP-118 Inductor

Post by Bombacaototal »

After a lot of back and forth dicussions with Triad Magnetics (a chap called Teri) about the infamous inductors used by Dumble on the early SSS circtuis they are finally advertising the SP-118 again. Unfortunately these are not being massed produced. The only way to get one is to place a min order of USD 100 (7 inductors) for those in USA and USD 200 (14 inductors) for those elsewhere in the world. Manufacturing time is a bit long and the inductors are pricey and the shipping estimated is June 2018.

Here is the link if anyone is interested
https://www.onlinecomponents.com/triad- ... p=12696440

If anyone is keen to get a bulk of those I'd be down for a couple but really cannot justify getting an order for 14 and paying USD 200 plus shipping plus taxes...

Attached the old spec sheet

DISCLAIMER: I have no affiliation to Triad Magnetics
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Bear
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Re: Triad Magnetics SP-118 Inductor

Post by Bear »

I thought the consensus view was that the SSS inductors are like male nipples--not functional, just aesthetic. If a group buy happens, the price isn't too dear, but is there really a thought that there is something we are missing from the right inductor or an undiscovered circuit change?
Bombacaototal
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Re: Triad Magnetics SP-118 Inductor

Post by Bombacaototal »

Bear wrote: Wed Jan 31, 2018 1:58 pm I thought the consensus view was that the SSS inductors are like male nipples--not functional, just aesthetic. If a group buy happens, the price isn't too dear, but is there really a thought that there is something we are missing from the right inductor or an undiscovered circuit change?
I doubt Dumble would use something just for aesthetic...
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martin manning
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Re: Triad Magnetics SP-118 Inductor

Post by martin manning »

The schematics floated here suggested an inductor in the 300 mH range. A 3H value in will have some effect at the upper end, 2-3 dB at 5-6 kHz. I suggest trying a Deluxe Reverb power supply choke in this location. I measured one I have (a Hammond) at 2.6H at 1kHz.
Bombacaototal
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Re: Triad Magnetics SP-118 Inductor

Post by Bombacaototal »

martin manning wrote: Wed Jan 31, 2018 3:51 pm The schematics floated here suggested an inductor in the 300 mH range. A 3H value in will have some effect at the upper end, 2-3 dB at 5-6 kHz. I suggest trying a Deluxe Reverb power supply choke in this location. I measured one I have (a Hammond) at 2.6H at 1kHz.
Yes, #002 and most likely #004 had the SP-118 (300 mH). I think only the #001 had the SP-117 (900mH).
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67plexi
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Re: Triad Magnetics SP-118 Inductor

Post by 67plexi »

I'm somewhat sure the Inductor idea was from the Gibson Varitone from 1961 1.5 Henry Inductor was used.

That said I have had better results using a higher gain EF86 with no Inductor pin 9 input pin 6 bass and treble switch input.

One more point on the Treble switch you will need a 4m7 blocking resistor on each of the switch contacts or you will get a pop when switching
as in this video.

https://www.youtube.com/watch?v=5gnbda0FyTc
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didit
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Re: Triad Magnetics SP-118 Inductor

Post by didit »

martin manning wrote: Wed Jan 31, 2018 3:51 pm The schematics floated here suggested an inductor in the 300 mH range. A 3H value in will have some effect at the upper end, 2-3 dB at 5-6 kHz. I suggest trying a Deluxe Reverb power supply choke in this location. I measured one I have (a Hammond) at 2.6H at 1kHz.
Perhaps there suppressing RF & parasitics? No time/patience to dig out formula & tools, so guessing foolishly 300mH in that circuit has 3dB knee up above 30KHz.

Best .. Ian
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martin manning
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Re: Triad Magnetics SP-118 Inductor

Post by martin manning »

The Triad data sheet is difficult to read, SP-118 looks like it says 3H. For a 300mH inductor the effect is negligible.
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didit
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Re: Triad Magnetics SP-118 Inductor

Post by didit »

Pulled image & zoomed in, pushed contrast etc, and reads (to me) with a decimal point as ".3H 4mA 42 Ohm DCR". The decimal also lines up vertically with the others. In that initial post the Triad component URL content also states "Inductor Wirewound 300mH 300Hz 3Q-Factor 4mA 40Ohm DCR RDL".

Best .. Ian
Bombacaototal
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Re: Triad Magnetics SP-118 Inductor

Post by Bombacaototal »

didit wrote: Wed Jan 31, 2018 8:13 pm Pulled image & zoomed in, pushed contrast etc, and reads (to me) with a decimal point as ".3H 4mA 42 Ohm DCR". The decimal also lines up vertically with the others. In that initial post the Triad component URL content also states "Inductor Wirewound 300mH 300Hz 3Q-Factor 4mA 40Ohm DCR RDL".

Best .. Ian
Thanks Ian, I am also pretty sure it is .3HY on the spec sheet

EDIT: Triad just confirmed that the original is indeed 300mH
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martin manning
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Re: Triad Magnetics SP-118 Inductor

Post by martin manning »

That’s the conclusion I came to, from a closer look at the Triad catalog sheet and the other linked site. With that I’m back to eliminating the inductor, since it basically does nothing.
Aaron
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Re: Triad Magnetics SP-118 Inductor

Post by Aaron »

67plexi wrote: Wed Jan 31, 2018 4:45 pm One more point on the Treble switch you will need a 4m7 blocking resistor on each of the switch contacts or you will get a pop when switching
as in this video.
It won’t pop if you use a make before break switch.

Aaron
Bombacaototal
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Re: Triad Magnetics SP-118 Inductor

Post by Bombacaototal »

For the inductor users, I was going through the spec sheet of SP-128, which is similar to the SP-118 but 0.1HY instead of 0.3HY (attached)

Side one is the inductance 0.1HY 5mA (left with the font facing) and side two the DC resistance with 15ohms (right with the font facing).

My question is, shall side 1 be connected to the 100K ohms resistor and side 2 to the low filter?
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dreric
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Re: Triad Magnetics SP-118 Inductor

Post by dreric »

Unobtaininum has been procured!
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Eric
1949 Zenith, Zenith Toggle Recoil, Zenith 55 & 440
Bombacaototal
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Re: Triad Magnetics SP-118 Inductor

Post by Bombacaototal »

dreric wrote: Sat Dec 07, 2019 2:45 am Unobtaininum has been procured!
I know, my instigation with them lead somewhere 8)
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