jea48
Responses from jea48
| Can you touch the tubes? I avoid touching the print, lettering/numbers, info on old 1950s-1960s 9 pin signal tubes. The oil from fingers can smear the print on the glass. . | |
| Ground Loop? I don’t understand why that works either, but I took a 4" piece of wire attached 2 spade lugs, 1 slid tight behind the loading potentiometer located on the back of the unit and connected the other end to the phono ground lug and the noise slowly ... | |
| Ground Loop? I kind of fixed it, no help from Parasound, but if I take a small piece of wire with a spade lug and slide it under the pot and connect it to the ground it goes away. @oldrocker52 , Is this the Parasound JC3 Jr phono preamp that you have? htt... | |
| Ground Loop? Luxman 507uX. I don’t see any indication the amp is Class II Listed. Can some one point it out... It does have a 2 wire power IEC inlet on the back panel, but, there is not the symbol designating the AC power wiring is Class II Listed. (Note, C... | |
| Ground Loop? It's a tapping sound with static but when I touch the loading pot in back it stops chattering but has a low-level hum. Jmho, that is not caused by a mains power ground loop. . | |
| Earth (isolated) ground vs. wall outlet ground. Puritan Audio offers a product Ground Master that requires adding a seperate ground rod that connects direct to the Puritian PSM156 power conditioner. They say it is safe, any thoughts? You can add as many Auxiliary ground rod to the branch cir... | |
| 230V Preamp USA @carlsbad2 , Not sure what you are trying to convey... Doesn't matter if the voltage is 220V, 230V, or 240V. NEC 210.6 (A) (A) Occupancy Limitation In dwelling units and guest rooms or guest suites of hotels, motels, and similar occupanci... | |
| 230V Preamp USA The best solution is to have electrician wire you 240 in your house and you will use best of the best. I doubt a credible licensed electrician will install a 240V branch circuit and 250V outlet to feed a 230V preamp. 2020 NEC 210.6 (A) (... | |
| Riddle me this.... This comes up when I try to send the edit You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Su... | |
| Riddle me this.... EDIT: Audiogon system would not let me edit just a few minutes after posting... A normal positive transient signal will cause a driver's speaker voice coil to push the cone forward. A negative signal transient will cause the voice coil to suck ... | |
| Riddle me this.... The term absolute phase just confuses the discussion. Signal Absolute Polarity is the terminology that should be used, imo... A normal positive transient signal will cause a driver's speaker voice coil to push the cone forward. A negative signal ... | |
| Riddle me this.... @antigrunge2 , Agree... Standouts where a definite difference could be heard? Etta James, "Love Songs". Track #1, "At Last". Change? Etta’s Voice. Polarity inverted her voice was thin. Correct polarity her voice was full, a more moving prese... | |
| Riddle me this.... Correct absolute polarity at speakers. Positive signal pushing speaker cone outward. Not negative inverted polarity sucking cone inward. :) https://www.youtube.com/watch?v=axXrs55X9kE | |
| Riddle me this.... @jeffseight I suggest you try it and listen for yourself. Here is some reading material for you: https://forum.audiogon.com/discussions/preamp-inverts-phase-question https://forum.audiogon.com/discussions/amp-inverted-or-non-inverted-phase h... | |
| Is this describing a blown tube, or two blow tubes? Tube testers are not very good for matching tubes, you may be able to weed out a shorted tube though. I’m not sure vintage tube testers were meant to match tubes. I doubt TV repair techs needed to match tubes as a rule. I have a Hickok 6... |