JGlatz
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Post by JGlatz on Jul 24, 2015 21:12:50 GMT
solderdude said: "In case of the 7193 tubes the cathode and grid are connected up top.
The Anode is connected to the socket.
"
Unless I misunderstood you I believe it is the Grid and Anode connected on top and the Cathode is connected to the socket pin 8. It does make sense what you said about interference but I think it depends on your setup. I did not have the 7193 setup before I switched to the Aluminum top and bottom plates. But I can say that by getting away from the plastic top and bottom my FrankenEmber is dead quiet. I currently have my setup at work, we manufacture AM and FM transmitters so suffice it to say I am in a heavy RF environment. We have stuff testing all the time. I cannot believe I don't get the slightest bit of hum or noise. For those using the aluminum plates and still getting hum or noise make sure the top and bottom plates are bonded together and use the resistor that is sent out with the plates to ground the plates to the circuit board. Also it is a good idea to scrape away a small portion of the anodized coating where the standoffs touch the aluminum plates at least in one corner. And definitely use a grounded outlet.
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solderdude
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measureutternutter
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Post by solderdude on Jul 24, 2015 22:48:36 GMT
You are correct... the grid and anode are connected to the top pin (not cathode). The relative insensitive cathode is connected to the base. So effectively the chance of interference is even bigger as the anode can pick things up as well as the wire to it  . That said, it is quite possible to stand next to strong transmitters and not get any interference yet a small mains transformer in it's proximity (below or just to the side) or a transmitter at a different frequency and perhaps even much lower power levels can become audible. It also has to do with modulation methods as well. Some of you may have been plagued by receiving a foreign radio station on certain days when listening to vinyl. (I know sometimes I 'received' a Russian station with my turntable) This depends on frequency, resonances, wire lengths, surface area's (stray) capacitances etc. Similar things can happen with 'exposed' circuitery (tubes or electronics) when not or improperly shielded. Screening the top and bottom, and indeed ensuring proper ground connections are made, the black stuff on the metal plates is actually an isolator and as JGlatz mentioned should be scraped away OR a washer that can punch through lacquer can be used. This can remove problems for person A but not necessarilly for someone else in a different situation. I have EMC tested a few products and during RFI tests sometimes only 1 or 2 frequencies cause problems while the rest of all frequency bands have no influence and it may even pass or completely fail tests depending on where the transmitter is located. Using a grounded outlet or grounding to waterpiping or central heating (when metal pipes are used) may be essential to get rid of nasties. It may ALSO be induced by equipment connected to the amp as well and that may have to be adressed. Needless to say the Ember SHOULD be able to play problem free when conditions are 'good'. When you experience nasties finding them can be daunting, just remember it should be possible to get it to work hum and 'noises' free. |
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Post by richard51 on Jul 25, 2015 0:25:13 GMT
solderdude said: "In case of the 7193 tubes the cathode and grid are connected up top. The Anode is connected to the socket. " Unless I misunderstood you I believe it is the Grid and Anode connected on top and the Cathode is connected to the socket pin 8. It does make sense what you said about interference but I think it depends on your setup. I did not have the 7193 setup before I switched to the Aluminum top and bottom plates. But I can say that by getting away from the plastic top and bottom my FrankenEmber is dead quiet. I currently have my setup at work, we manufacture AM and FM transmitters so suffice it to say I am in a heavy RF environment. We have stuff testing all the time. I cannot believe I don't get the slightest bit of hum or noise. For those using the aluminum plates and still getting hum or noise make sure the top and bottom plates are bonded together and use the resistor that is sent out with the plates to ground the plates to the circuit board. Also it is a good idea to scrape away a small portion of the anodized coating where the standoffs touch the aluminum plates at least in one corner. And definitely use a grounded outlet. Salutations JGlatz, i am in heaven now with my 7193 tubes....Thanks to you.... By the way if you listen music with headphone also i discovered that all headphones are plagued with vibrations....some weeks ago i was satisfied so much with my stax basic system and my monsoon planars that i was not interested anymore in my hifiman he 400...I decided to isolate them with sorbothane...WOW I prefer my he 400 now they are better than my Stax ( more real-3 d sound) and better than my Monsoon...! 12 patches of 1/8 inches sorbothane (duro 30 ) glued to the exterior cups of the he 400 ... This mod was extraordinary... I will experiment it with the Stax but with them i must open them.... For now i was in heaven with the he 400... I want to repay you with my thankfully impressions and experience.. best regards to you |
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JGlatz
valued member
Posts: 26
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Post by JGlatz on Jul 27, 2015 2:10:25 GMT
Richard, I am glad you are enjoying your Ember with the 7193 setup. I too think it is the best tube I've heard in it. It is fortunate I stumbled across this tube it seems there are a few more people enjoying the setup as well. This is a great hobby we have and it is nice to have the forum to share ideas and findings. That's an interesting approach on your headphones how does that affect the sound?
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Post by musicman on Jul 27, 2015 2:40:12 GMT
Hi JGlatz, just wanted to chime in and say that I agree that this combo is the best I have heard from the Ember, many thanks for putting us on to it. All the best Don
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Post by richard51 on Jul 27, 2015 11:36:41 GMT
Richard, I am glad you are enjoying your Ember with the 7193 setup. I too think it is the best tube I've heard in it. It is fortunate I stumbled across this tube it seems there are a few more people enjoying the setup as well. This is a great hobby we have and it is nice to have the forum to share ideas and findings. That's an interesting approach on your headphones how does that affect the sound? In the speakers and headphones more detailed 3 -d sound betterment across all frequencies particularly in the higher and bass frequencies... ...The other spectacular transformation for my headphones come from the vibration plague affecting all headphones....I put 12 patches of self stick sorbothane (duro 30 1/8 inches) around each cups and in the he 400 hifiman headphones mids less recessed more staging 3-d sound my he 400 planars are now high end audio... read this forum of HEADFI : «Damping Mechanical Resonance Distortion of STAX phones with SORBOTHANE: LAMBDAS, SRXIII PRO, SR003, SR00, the SIGMA and various non-STAX » |
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olindh
valued member
Posts: 11
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Post by olindh on Jul 27, 2015 19:51:08 GMT
I am really loving the 7193 setup but I still can't resist tube rolling. I am waiting for a couple of E1148 that I bought on Ebay: www.ebay.com/itm/121541009513?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITI am also planning on trying out the 6f8g and 6c8g. Is there any tube that can stand up to the 7193? I have read about DHT tubes but I can't find any running at 6.3 volts. Moving the amp away (or the gear inducing nasties), playing with grounding (connecting to safety ground, central heating, waterpiping (when copper) or screening it may remove these problems. Agreed. The humming sound was really loud when I connected the Ember to my Ipad. When I connected the Ember to my desktop the humming sound almost went away so I guess the Ember grounds itself through the desktop connection. |
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Deleted
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Post by Deleted on Jul 31, 2015 19:06:47 GMT
The aluminium top-plate sure does show up greasy fingerprints. My fish supper had nothing to do with it, honest.  |
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Post by richard51 on Jul 31, 2015 23:33:29 GMT
The aluminium top-plate sure does show up greasy fingerprints. My fish supper had nothing to do with it, honest. My aluminium top plate does show up greasy fingerprints.... nothing to do with my fish and ship me too... i know that is my wife planning to kill my object of love ...i think... |
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Post by matttcg on Aug 1, 2015 12:37:30 GMT
I'm an hd650 guy for the most part, it's my go to headphone. I'm also liking the Project Ember with planars. The pm-1 makes a very nice pairing using low impedance.
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Post by matttcg on Aug 1, 2015 18:02:50 GMT
I've noticed that the background on this amp is not "completely" black. There is a soft "shhhh." Very slight but there nonetheless. Just curious if this is inherent to the design.
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Rabbit
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Post by Rabbit on Aug 1, 2015 18:13:22 GMT
Tube amps tend to work better IMO with higher impedance headphones. They require more voltage rather than current. This also lessens noise.
Also, some tubes can be noisier than others, depending on age and condition.
Another reason why I like the Polaris a lot. It works better with low impedance, sensitive headphones IMO. It also retains a 'flavour' of tube sound which is quite remarkable for an ss amp.
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Post by ronzo56 on Aug 1, 2015 18:36:50 GMT
Some tubes will have that slight sound. Others are dead quiet. No way of telling in advance. My quiet tubes with no music playing I can turn up all the way and hear nothing. Others you can hear tube hiss.
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Post by matttcg on Aug 1, 2015 19:11:08 GMT
So is this to say that the Polaris would pair better with planar mag headphones?
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Rabbit
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Post by Rabbit on Aug 1, 2015 19:13:32 GMT
It's probably a good match. You could easily change the tube though.
I guess the better the headphone, the more easily it will pick out artifacts as well.
I' m guessing here, but you may be less likely to get noise from a Polaris. I have both and have noticed noise from some tubes of the Ember. Generally old ones or ones that are on their way out or just duff ones!!
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