Thanks but I’m looking for a used one
The Stax Thread III
urs
100+ Head-Fier
When I wrote stax srm in the search bar nothing came up, thanks
It's more likely to be a cable or cable connection problem. But that doesn't mean that energizers never fail. Try putting some gentle pressure on the cable especially where it enters the phones or near the plug. A better test would be borrowing another energizer or having someone temporarily swap the channels (soldering @ the socket) or see what is there with a scope.
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Update on stax power supplies.. don't have my second 212 yet but tried with 252. Bought this: https://www.amazon.com/gp/product/B01LBX8D58
It works, and seems to make the sound a little warmer and punchier. However, there is a buzzing due to ground issue or something that the stock power supply does not have. I *might* also be hearing less detail but it could also just be because of the extra punch. Looks like I am going to have to buy the expensive ifi ipower after all.
It works, and seems to make the sound a little warmer and punchier. However, there is a buzzing due to ground issue or something that the stock power supply does not have. I *might* also be hearing less detail but it could also just be because of the extra punch. Looks like I am going to have to buy the expensive ifi ipower after all.
Folks, I replaced all the electrolytic capacitors in my SRM-600.
I can't say for sure if this has happened before, but this (photo) capacitor at 10V 4700uF is heating up. Not very much, around 55C. The headphones aren't plugged in.
Can you tell me if this capacitor is in normal operation? Does it have to warm up?
I can't say for sure if this has happened before, but this (photo) capacitor at 10V 4700uF is heating up. Not very much, around 55C. The headphones aren't plugged in.
Can you tell me if this capacitor is in normal operation? Does it have to warm up?
That's suspect. Electrolytic caps can dissipate significant heat but they usually run cooler than that. The cap is rated to operate up to 105C, so that temperature by itself isn't going to cause a failure. But why is it so hot? It may be normal for this amp, hard to say without a schematic and scope waveform.
It would be unusual to design an amp to run this way. A typical design goal might be 25 - 35C typical @ full load and 65C absolute max @ full load and 40C room temperature. Cooler is better and greatly extends component lifetime. If you are measuring a surface temperature of 55C with the cover off, then the core temp is probably 65C. And possibly 70 - 80C with the amp buttoned up.
Possibly a defective cap or a damaged cap e.g. if it got too hot while soldering. Or there might be another fault in the amp stressing the cap. There isn't enough information to really know. In your place, I'd at least try replacing the cap with another one and see if the operating temperature goes down. And perhaps try to get another SRM-600 owner in the forum to see if this cap in their amp also runs hot?
My SRM-600 for 230V voltage.
First, I supplied a cheap Jamicon TKR472M1AJ26 capacitor. It was heating up.Then I decided to place EEUFR1A472L Panasonic Low ESR capacitor. However, it's warming up, too.
Since the SRM-600 is very similar to the T1, I suppose that's the highlighted part of the circuit.
I checked the diodes next to it - they're not broke.
Hmmmm....
First, I supplied a cheap Jamicon TKR472M1AJ26 capacitor. It was heating up.Then I decided to place EEUFR1A472L Panasonic Low ESR capacitor. However, it's warming up, too.
Since the SRM-600 is very similar to the T1, I suppose that's the highlighted part of the circuit.
I checked the diodes next to it - they're not broke.
Hmmmm....
The Panasonic part is a good quality cap. I can only speculate that there is another fault in the amp.Or soldering exceeded 350C/3 seconds.
Thanks for the schematic but an approximation is not sufficient to attribute the temperature to circuit design.
Thanks for the schematic but an approximation is not sufficient to attribute the temperature to circuit design.
kevin gilmore
Señor Stax. Señor MAXX.
Can Jam '10 Organizer
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pretty sure the original cap is 25v rated.
yep, the original caps are 470uf/25v
should be about 13VDC on the cap
yep, the original caps are 470uf/25v
should be about 13VDC on the cap
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The SRM-600 has the following electrolytic capacitors:
4 pcs ELNA LAH 220uF 400V 25х45mm/10mm
REPLACEMENT:
TDK/EPCOS B43642 220uF 400V 25x35mm/10mm (B43642B9227M0) <-- I replaced it with this one.
ELNA LAZ 470uF 400V 25x55mm/10mm (LAZ S38 105C = LAZ-400V471S38)
Nichicon LGR 220uF 400V 25x50mm/10mm (LGR2G221MELA50)
Rubycon VXH 220uF 450V 25x35mm/10mm (450VXH220MEFCSN25X35)
1 pcs ELNA RJ4 4700uF 10V 12.5x25mm/5.0mm (NEED Rated current = 1780 & ESR = 0.11!)
REPLACEMENT:
Panasonic 4700uF 10V 12.5x30mm/5.0mm (EEUFR1A472L) <-- I replaced it with this one.
ELNA RJD 4700uF 10V 12.5x30mm/5.0mm (RJD I7 105C = RJD-10V472MJ7)
Panasonic 4700uF 10V 12.5x35mm/5.0mm (EEUFM1A472L)
2 pcs SANYO 470uF 35V 10х16mm/5.0mm (S.E.8N Black 85C 35ME470HC)
REPLACEMENT:
TDK/EPCOS 470uF 35V 10х20mm/5.0mm (B41888C7477M000) (ORANGE COLOR!) <-- I replaced it with this one.
ELNA RJD 470(560)uF 35V 10х20mm/5.0mm (RJM 35V H5 105C)
Panasonic 470uF 35V 10х16mm/5.0mm (EEUHD1V471)
Panasonic 680uF 35V 10х16mm/5.0mm (EEUHD1V681)
2 pcs ELNA RC3 47uF 16V 6.3x5.0mm/2.5mm (RC3 F0 Blue 85C = RC3-16V470MF0)
REPLACEMENT:
HITANO E5R 47uF 25V 105° 6.3x5.0mm/2.5mm <-- I replaced it with this one.
ELNA R3S 47uF 16V 6.3x5.0mm/2.5mm (R3S F0 Black 105C = R3S-16V470MF0)
Nichicon UTT 47uF 16V 6.3x7.0mm/2.5mm (UTT1C470MDD1TP)
2 pcs ELNA RC3 10uF 50V 6.3x5.0mm/2.5mm (RC3 F0 Blue 85C = RC3-50V100MF0)
REPLACEMENT:
ELZET 22uF 50V 105° 6.3x5.0mm/2.5mm (CD50H) <-- I replaced it with this one.
ELNA R3S 10uF 50V 6.3x5.0mm/2.5mm (R3S F0 Black 105C = R3S-50V100MF0)
Yes, T1 needs 2 pcs of 470uF/25V, but the SRM-600 uses one 4700uF/10V capacitor. On the cap ~7V.
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Any other caps running warm/hot? Can you double check the original part values against the replacements?
As you said two replacements for the 4700uF/10V running hot, could be excessive ripple current out of the supply.
As you said two replacements for the 4700uF/10V running hot, could be excessive ripple current out of the supply.
urs
100+ Head-Fier
@AceMew,
The "Filtering" in AudioMarkt can be tricky - there are even more STAX AMPS..
Select STAX in Manufacterer - or Hersteller; you could fine tune further under Product category
https://www.audio-markt.de/en/marke...field_manufacturer_id=2094&filter_submitted=1
Regards
Urs
The "Filtering" in AudioMarkt can be tricky - there are even more STAX AMPS..
Select STAX in Manufacterer - or Hersteller; you could fine tune further under Product category
https://www.audio-markt.de/en/marke...field_manufacturer_id=2094&filter_submitted=1
Regards
Urs
astrostar59
BannedMember of the Trade: Aries Cerat Espana, Auriculares High-EndAKA Headstage, headphoneweekend
Wow, that is going to be super fiddly getting those caps off.The SRM-600 has the following electrolytic capacitors:
4 pcs ELNA LAH 220uF 400V 25х45mm/10mm
REPLACEMENT:
TDK/EPCOS B43642 220uF 400V 25x35mm/10mm (B43642B9227M0) <-- I replaced it with this one.
ELNA LAZ 470uF 400V 25x55mm/10mm (LAZ S38 105C = LAZ-400V471S38)
Nichicon LGR 220uF 400V 25x50mm/10mm (LGR2G221MELA50)
Rubycon VXH 220uF 450V 25x35mm/10mm (450VXH220MEFCSN25X35)
1 pcs ELNA RJ4 4700uF 10V 12.5x25mm/5.0mm (NEED Rated current = 1780 & ESR = 0.11!)
REPLACEMENT:
Panasonic 4700uF 10V 12.5x30mm/5.0mm (EEUFR1A472L) <-- I replaced it with this one.
ELNA RJD 4700uF 10V 12.5x30mm/5.0mm (RJD I7 105C = RJD-10V472MJ7)
Panasonic 4700uF 10V 12.5x35mm/5.0mm (EEUFM1A472L)
2 pcs SANYO 470uF 35V 10х16mm/5.0mm (S.E.8N Black 85C 35ME470HC)
REPLACEMENT:
TDK/EPCOS 470uF 35V 10х20mm/5.0mm (B41888C7477M000) (ORANGE COLOR!) <-- I replaced it with this one.
ELNA RJD 470(560)uF 35V 10х20mm/5.0mm (RJM 35V H5 105C)
Panasonic 470uF 35V 10х16mm/5.0mm (EEUHD1V471)
Panasonic 680uF 35V 10х16mm/5.0mm (EEUHD1V681)
2 pcs ELNA RC3 47uF 16V 6.3x5.0mm/2.5mm (RC3 F0 Blue 85C = RC3-16V470MF0)
REPLACEMENT:
HITANO E5R 47uF 25V 105° 6.3x5.0mm/2.5mm <-- I replaced it with this one.
ELNA R3S 47uF 16V 6.3x5.0mm/2.5mm (R3S F0 Black 105C = R3S-16V470MF0)
Nichicon UTT 47uF 16V 6.3x7.0mm/2.5mm (UTT1C470MDD1TP)
2 pcs ELNA RC3 10uF 50V 6.3x5.0mm/2.5mm (RC3 F0 Blue 85C = RC3-50V100MF0)
REPLACEMENT:
ELZET 22uF 50V 105° 6.3x5.0mm/2.5mm (CD50H) <-- I replaced it with this one.
ELNA R3S 10uF 50V 6.3x5.0mm/2.5mm (R3S F0 Black 105C = R3S-50V100MF0)
Yes, T1 needs 2 pcs of 470uF/25V, but the SRM-600 uses one 4700uF/10V capacitor. On the cap ~7V.
Any other caps running cold. Only 4700uF/10V running warm.
I double-checked all capacitors parameters and they match (or exceed) the original:
Original:
ELNA LAH400V221MS36 220uF 400V 25х45mm/10mm <--- Rated ripple current (RRC Arms) = 0.87
Replacement:
TDK/EPCOS B43642B9227M0 220uF 400V 25x35mm/10mm <--- RRC = 1.03 & ESR at 100 Hz = 460 & Impedance = 680
Original:
ELNA RJ4 4700uF 10V 12.5x25mm/5.0mm <--- RRC = 1250 & ESR = 0.11
Replacement:
Panasonic EEUFR1A472L 4700uF 10V 12.5x30mm/5.0mm <--- RRC = 3630 & Impedance = 0.013
Original:
SANYO 35ME470HC 470uF 35V 10х16mm/5.0mm (S.E.8N Black 85°C Standard series) <--- RRC = 585
Replacement:
TDK/EPCOS B41888C7477M000 470uF 35V 10х20mm/5.0mm (B41888C7477M000) <--- RRC = 1500 & ESR at 10 kHz = 0.050 & Impedance = 0.046
Original:
ELNA RC3-16V470MF0 47uF 16V 85°C 6.3x5.0mm/2.5mm (RC3 F0 Blue 85°C) <--- RRC at 85°C = 70
Replacement:
HITANO E5R 47uF 25V 105°C 6.3x5.0mm/2.5mm <--- RRC at 105°C = 60
Original:
ELNA RC3-50V100MF0 10uF 50V 85°C 6.3x5.0mm/2.5mm (RC3 F0 Blue 85°C) <--- RRC at 85°C = 40
Replacement:
ELZET CD50H 22uF 50V 105°C 6.3x5.0mm/2.5mm <--- RRC at 105°C = 40
Before the replacement, I did not check if the 4700uF/10V had been warmed. This could be his normal operating condition.
It is simply not clear to me which components of the circuit can affect it: from the transformer comes two BLU-wires at 6.3V AC current, then there are two diodes in parallel converting to DC current, and then there is a 4700uF/10V capacitor, which receives these 6.3VDC. There is simply nothing to break.
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