solderdude
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Post by solderdude on Aug 23, 2015 7:44:18 GMT
I tried the 7193 to 12AU7 adapter in my Starlight and Horizon and both work fine. Any reason why it doesn't work with the Sunrise? Nope... should work for the SR when it works fine on Horizon and Starlight as the heater circuits are all the same. The Ember differs though because of how the auto heater select has been created. So it's possible the adapters work well on all Garage 1217 amps (when the heaters are set to 12V when a 6V tube is used). Also possible they work fine on all amps but NOT on the Ember. This depends on how the adapter is wired inside. |
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Post by musicman on Aug 28, 2015 0:50:36 GMT
solderdude, can the 6J5 be used in place of the 7193 tubes on the Ember? Another member is using them on his Horizon. www.head-fi.org/t/702826/project-ember-tube-rolling/810#post_11872179 HOWIE13 offline 278 Posts. Joined 6/2012 Location: Scotland Quote: Originally Posted by Solrighal View Post It's already way beyond annoying, lol. Is the 6J5 better then? Not necessarily better-but unexpectedly different. I was expecting it to sound just like the 6SN7, since it's the same only in two separate tubes-but blimey-it's completely different. It's much tighter in the bass, but I think goes deeper. Leaner and clearer in the lower mids and still well extended and sweet in the treble. The mids are more forward. Altogether, much more detailed, up-front, though not claustrophobic, sound but with less warmth than the 6SN7, more like a good Bugle Boy,Tesla or Tungsram ECC 88, BUT it retains the wider and deeper sound-stage of the 6SN7. Compared to the 7193 it has more detail but sound-stage is a bit smaller, (more like the 6SN7). In the Horizon it's like moving to the front row on an adrenaline surge. :gs1000smile: It may not suit bright cans but could give the kiss of life to warmer, neutral kit. When I recover I'll try it in the Ember with an HD650 PS. Tubes are Sylvania-they have silver, metal base-look around 1960's. That's all I know about them. |
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solderdude
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Post by solderdude on Aug 28, 2015 9:19:07 GMT
You can use those tubes with the proper adapter.
The 7193 has the plate (anode) and grid connected to the top connectors.
For the 6J5 the plate needs to be connected to pin 3 on the base and the grid to pin 5.
2 tubes will draw 600mA from the heater supply.
A supercharger is recommended.
Chances are the stock heater power supply could possibly be maxed out on current.
Can't comment on perceived SQ though.
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Post by tunkejazz on Aug 30, 2015 9:20:25 GMT
BTW, I am sure this has been asked before but I find it hard to dig this info from 105 pages of posts: are there plans to design/build a garage1217 adaptor for 7193 tubes?
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solderdude
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Post by solderdude on Aug 30, 2015 9:46:51 GMT
I don't think there are any plans but when there is enough demand for it Jeremy might.
The problem is 'volume'.
It isn't hard to design a PCB and obtain decent sockets and pins.
The problem is having the PCB's made in small numbers is very costly.
To make it affordable you would have to buy a large quantity of PCB's and that is rather pointless if you only sell a small quantity.
I don't want to plant ideas in Jeremy's head about an amp with 2 octal (or Noval) tube base on it.
He needs to finish a few other projects first:
Linear power supply
Filter board
IEM attenuation adapter
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Post by tunkejazz on Aug 30, 2015 10:29:00 GMT
I don't think there are any plans but when there is enough demand for it Jeremy might. The problem is 'volume'. It isn't hard to design a PCB and obtain decent sockets and pins. The problem is having the PCB's made in small numbers is very costly. To make it affordable you would have to buy a large quantity of PCB's and that is rather pointless if you only sell a small quantity. I don't want to plant ideas in Jeremy's head about an amp with 2 octal (or Noval) tube base on it. He needs to finish a few other projects first: Linear power supply Filter board IEM attenuation adapter It makes sense to focus in those 3 projects, they are more important. Thanks for the info! |
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Post by tunkejazz on Aug 30, 2015 19:42:25 GMT
Another question, I have noticed that when I use the Ember in my office, depending on where I place the Ember on my table and which tube I use, the amp can start to catch some EMI. In general 6sn7 tubes suffer much less from this problem. I usually need to move the amp around to find a spot where it is quiet/mostly quiet. At home it is totally quiet all the time.
Any experience with this? Any way of ameliorating the EMI noise?
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Post by tunkejazz on Sept 1, 2015 9:17:45 GMT
Nothing? Could the metal cover help? I have the acrylic one.
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Deleted
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Post by Deleted on Sept 1, 2015 9:51:25 GMT
Nothing? Could the metal cover help? I have the acrylic one. Change your office or job? There's a million things in the office environment that could potentially cause problems but it works at home so it's definitely your environment that's to blame. |
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solderdude
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Post by solderdude on Sept 1, 2015 9:53:09 GMT
It would depend on where the interference enters.
It could be from the power supply line (acting as an antenna), in which case, maybe 3 or 4 windings through a suitable ferrite MAY possibly help.
Could also enter the amp from line in wires (also acting as an antenna) with possibly the same solution.
In some cases the metal bottom or top could offer some improvement but may not at all.
A completely shielded enclosure (metal) which is connected to the audio ground may well remove the problems... but is quite impractical unless a nice enclosure replaces the perspex top/bottom.
Could also be caused by a groundloop in which case tinkering with the power supply lines maye reduce or remove it.
In some cases the screening of the interlinks may cause the problems.
It could also be cured sometimes by actually grounding the 'audio ground' but in some cases could make it worse.
Most effective will probably be to move the amp away as far as possible from the source of the interference.
You could try to find out which one it is by moving it away or switching it off.
It could be sensitive to cell phones but completely insensitive to wifi, (high or low band) or vice versa.
There is no way to tell what is the problem (from behind my keyboard).
I am convinced, however, that the amps can be totally silent even with lots of RF around.
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Deleted
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Post by Deleted on Sept 1, 2015 10:24:11 GMT
My PE MkII sits 15cm from my Mac which is connected to the internet via WiFi. My mobile phone also sits on the same shelf and my Xbox (also connected via WiFi) lives on the shelf below.
I get zero noise or interference.
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Post by tunkejazz on Sept 1, 2015 11:41:30 GMT
Um, I think I will try to play with the power cable and with the interconnect. Thanks for the heads-up.
Changing job...xDDD, maybe an option for the future, we are getting a baby this month and a man needs to eat!
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Deleted
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Post by Deleted on Sept 1, 2015 16:25:33 GMT
Do NOT eat the baby!  |
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oldson
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Post by oldson on Sept 1, 2015 22:03:36 GMT
liking the pics of the Ember on G1217 with the optional knob!!
Jeremy , where can i purchase one of those knobs?
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obo78
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Post by obo78 on Sept 1, 2015 23:15:28 GMT
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