filipm
Responses from filipm
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @dover the chassis and the board are connected by those green wires. board > right green wire > binding post < left green wire - 33ohm resistor - ground pin of the IEC. (which means the left and right wire are meeting in the binding pos... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @dover It’s the other way around on the EAR I guess. Here is a picture of the ground binding post. The wire on the right is connected to the circuit board. The one on the left leads to the IEC through the 33 ohm resistor. That means the chass... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @lewm Yes, I didn't realize the resistor might be there. I was told that sometimes it's intentional to avoid ground loops. But at the cost of poor grounding? I'll buy a new one but I'll also try to solder the ground wire without the resistor. ... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @ejb14 they sell them here, about 20 cents a piece. they have two options, 33ohm 1W or 33ohm 3W. but nice guess - vishay dale :) I have already taken pictures of the preamp. I think I'll sell it. I'm always reading how wonderful it sounds, how up... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @lewm so removing that 33ohm resistor wouldn't be a good idea if I understand it correctly. The resistor is right behind the ground plug of the inlet so it's basically anywhere if I place one probe on that plug. | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? There's a 33ohm resistor on the grounding cable between the chassis and the inlet. | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @atmasphere It is pretty simple - the resistance occurs here. It's either in the wire or in the joint. But the resistance between the grounding pin of the chassis (not the inlet) and the solder joint is 0.01. I'll try to resolder the chassis g... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @dpop I'm still here. Just working late last few days and haven't got the time to reply properly. I'm not sure if things are resolved but what @atmasphere mentioned sounds like the answer. I haven't got a reply from the EAR factory what are thei... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @atmasphere yes, I was referring to the EAR. I have measured the impedance between the ground of the RCA input/output and the chassis. You're right - it's 0.01 ohms. Seems like there's a poor grounding on the inlet. I wrote to EAR if that's on ... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @ejb14 We'll see what we can find on the AC line but I wouldn't be surprised. I am already looking at some power plants. Not sure if PS Audio is the way to go, I have been told by ARC that they recommend plugging their power amps directly to the w... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @ejb14 These had to be replaced. R16 died, the others were replaced along with it. It stopped working for a while as I was experimenting with it. I'm thinking of sending it to the factory, at least I will write them again with a sugges... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @dpop I have tried these chains: TT - EAR - Bryston B60 TT - EAR - Classe CP60 + CA200 TT - EAR - ARC LS16 + CA200 or REF150 TT - CP60 + CA200 (as the CP60 has a solid state phono stage) (the LS16 doesn't have a phono stage even tho it says ... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @lewm I have done that. A quarter of a turn for each transformer to be fully tied up. I could probably do a little more but I'd have to push it hard. I'm already ok with spending something extra for a service, I just hope they won't suggest anythi... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @ejb14 I am :) I guess I’d have to get two of these Humdinger units - one for the power amp and one for the rest. Also, the question is how it restricts the dynamics of a power amp. I have measured the impedance between the ground plug on the in... | |
| Tube PHONO preamp interference - RFI, EMI, bad grounding? @ejb14 you have mentioned to check for DC presence on the line. Three days ago I have finally received an IEC19 connector for the ARC REF150 power cord and plugged it into the wall (instead of into a power conditioner that restricts the dynamics).... |