USIEL

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2240 on: February 25, 2019, 09:40:12 AM »
thank you whoops ,
channel 3 is working  great now  ....made the classic elco polarity mistake  :o
i'll check and measure   channel 4 again and again.......

thanks for your time !





JW

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2241 on: February 27, 2019, 01:29:19 PM »
Okay,

Maybe this is voodoo territory, but polystyrene caps are "polarity sensitive" as Martin says in the build documents, but only to the extent that it's slightly better shielding for the cap to have the foil side connected to ground (unless they're used where one side isn't connected to ground in which case it doesn't matter) Correct?

Well, numerous of these styrenes are used where connected to ground in this circuit.

Does anyone know how to determine the foil side of a polystyrene cap? I can't for the life of me see it with my eye. (I happened to order the Xicon polystyrene caps from Mouser but they came as radials not axials.) Oh well. I don't really care about that, just how to see or determine the foil side of the cap.

Whoops

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2242 on: February 27, 2019, 01:51:35 PM »
it's slightly better shielding for the cap to have the foil side connected to ground

Yes, but maybe marginally minimal better,
these are really small caps, inside a metal box


(unless they're used where one side isn't connected to ground in which case it doesn't matter) Correct?

Wrong.
Foil side should always connect to the lower impedance part of the circuit.

It really doesn't matter in this build,
It's more relevant inside Tube Amplifiers where the film caps can be quite big (bigger area for noise induction) and can be next to heater wires or other internal source of noises.

Does anyone know how to determine the foil side of a polystyrene cap? I can't for the life of me see it with my eye. , just how to see or determine the foil side of the cap.

Easy:

http://lmgtfy.com/?q=how+to+determine+foil+side+of+caps


Potato Cakes

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2243 on: February 27, 2019, 03:14:24 PM »
The four channel version that I built years ago uses polystyrene caps and I paid no attention to the position of the foil. All the channels are quite and sound awesome. Depending on the quality of your test equipment, you might be able to measure some type of difference, but as Whoops pointed out it would be marginal and I doubt you would hear a difference. Just put them in there and make sure you don't overheat them.

Thanks!

Paul

JW

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2244 on: March 21, 2019, 03:40:41 PM »
Looking for a good 4 channel power supply for this one (w/ phantom hopefully) Five Fish ain't emailing back. I'm not sure, but one of the JLM ones might be a switching supply (?) Can't tell. Don't take my word for it. But anyway, any recommendations? There's a lot of options for 2 ch's. Not sure about 4.

Potato Cakes

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2245 on: March 21, 2019, 07:51:38 PM »
JLM Powerstation is linear but has a switch on it to go from 240v to 115v. The JLM TREX and TREX2 with the 840w SMPS is switching. Both options will do 4 channels. It's listed on each product page on this website.

Thanks!

Paul


 

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