@ziggy The EMI socket is interesting on these PSUs, neither of my Megas have this kind of filtered socket (Well, none of my machines has one full stop, not even my MSTE and I've never seen one at all!), but here you have one for a Mega, and exxos' PSU page shows one in a normal ST mount.
Makes me wonder if the EMI filter is older or newer? Atari were big money savers and I expect that EMI socket cost a few cents more, so did they change it later for a basic one, or add it later in order to resolve problems?
Curious
Mitsumi SR151 Overheating, almost burning?
- rubber_jonnie
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Re: Mitsumi SR151 Overheating, almost burning?
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
- frank.lukas
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Re: Mitsumi SR151 Overheating, almost burning?
Look at Ebay for 2SC3459
Re: Mitsumi SR151 Overheating, almost burning?
@rubber_jonnie
I never paid attention to it.. maybe I should check al the other ST, MST, STE, MSTE, TT for these filter sockets. And you're right, Atari definitely saved every cent possible
@frank.lukas
I find them to be a little "expensive", with >7€ for NOS transistors Some newer model still in production is most likely cheaper and more efficient, or is that a wrong assumption?
Greetings
I never paid attention to it.. maybe I should check al the other ST, MST, STE, MSTE, TT for these filter sockets. And you're right, Atari definitely saved every cent possible
@frank.lukas
I find them to be a little "expensive", with >7€ for NOS transistors Some newer model still in production is most likely cheaper and more efficient, or is that a wrong assumption?
Greetings
Re: Mitsumi SR151 Overheating, almost burning?
NTE2348 is a equivalent to the 2SC3459
Farnell show stock
Tom
Farnell show stock
Tom
Re: Mitsumi SR151 Overheating, almost burning?
The EMI socket is never found in an Atari for one good reason. Its not needed. Most often they are found in high end test equipment and medical equipment where measurements made are low level and increased rf interference would degrade those measurements. Putting one in an Atari is akin to putting a catalytic converter on a leaf blower. Its not going to hurt anything but its not going to provide noticable positive effects.
- rubber_jonnie
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Re: Mitsumi SR151 Overheating, almost burning?
The only one I've ever seen is in the picture of the Mitsumi on exxos' PSU page. I've got 13 different PSUs here (I actually went off and checked) and none have it. Seems to me it's something a user may have fitted rather than something that Atari ever supplied.PaulJ wrote: ↑Sun Jun 07, 2020 11:13 pm The EMI socket is never found in an Atari for one good reason. Its not needed. Most often they are found in high end test equipment and medical equipment where measurements made are low level and increased rf interference would degrade those measurements. Putting one in an Atari is akin to putting a catalytic converter on a leaf blower. Its not going to hurt anything but its not going to provide noticable positive effects.
Love the catalytic converter analogy @PaulJ
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: Mitsumi SR151 Overheating, almost burning?
The closest I've seen in an Atari is the toroidal ring on the ground wire on some of the power supplies. A far cry from a EMI socket. Matter of fact the bracket on a normal ST power supply there is only room for a generic HP style power connector due to the metal bracket is flat and the board starts 1/8" after the power terminals. On a mega St bracket the power receptacle is raised so an elongated power connector would have additional room. I guess the EMI socket is for the Ataian that has everything!
Re: Mitsumi SR151 Overheating, almost burning?
Yes a review of my psu shows a basic socket. The chokes appear to be on the power supply. I guess it saved a nickle. What are radio waves anyway
Tom
Tom
- rubber_jonnie
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Re: Mitsumi SR151 Overheating, almost burning?
Yes, I've seen that toroidal ring, and also the clip on version in a plastic shroud. I had to replace the power switch in my MSTE recently, and I can tell you it's a tight fit even with just a basic socket, let alone one of the EMI type.PaulJ wrote: ↑Mon Jun 08, 2020 12:34 am The closest I've seen in an Atari is the toroidal ring on the ground wire on some of the power supplies. A far cry from a EMI socket. Matter of fact the bracket on a normal ST power supply there is only room for a generic HP style power connector due to the metal bracket is flat and the board starts 1/8" after the power terminals. On a mega St bracket the power receptacle is raised so an elongated power connector would have additional room. I guess the EMI socket is for the Ataian that has everything!
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: Mitsumi SR151 Overheating, almost burning?
Maybe @exxos fitted the EMI socket for his PSU measurements? Guess I can reinstall the old socket then and wait for my switching regulator to arrive