solderdude
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Post by solderdude on Aug 18, 2015 4:55:42 GMT
You must send it to the Netherlands for (future) upgrades.
Don't think there will be many of them though.
Can convert Ember to Ember-2 if needed.
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oldson
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Post by oldson on Aug 18, 2015 18:27:10 GMT
You must send it to the Netherlands for (future) upgrades. Don't think there will be many of them though. Can convert Ember to Ember-2 if needed. sounds good to me. may be a few months yet , if thats ok? |
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solderdude
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Post by solderdude on Aug 18, 2015 19:54:19 GMT
Whenever you want is fine by me.
I have a 'Supercharger' lying around somewhere.
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dicky
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Post by dicky on Aug 19, 2015 10:21:22 GMT
Nope, in fact Jeremy is working on the proto this week but found a snag that needs to be resolved. The snag is the inrush current of some tubes which is on the high side. Jeremy is working on some possible solutions. Could this 'inrush current' be the cause of a clicking relay and flashing LED on start-up?
If I switch off, wait and switch on again it usually powers up (I have the supercharger mod).
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solderdude
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Post by solderdude on Aug 19, 2015 10:49:14 GMT
Yes, the inrush current is the cause of this.
At this moment we are batteling this issue with the linear.
The supercharger IC has a possible solution for this as it can do a delayed start with just 2 added components.
Exploring several options for this.
Basically the power supply is going in 'current overload' and drops its output voltage in an attempt to lower the current.
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dicky
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Post by dicky on Aug 19, 2015 18:20:39 GMT
Ah, looks like I might need a 'linear' then.
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solderdude
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Post by solderdude on Aug 19, 2015 18:42:06 GMT
Well ... for now the linear still does the same (dips under heavy tube heater load at start-up) but it will be solved I am sure.
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Deleted
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Post by Deleted on Aug 19, 2015 18:48:04 GMT
God, I love this amp!
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Post by melkenshawn on Aug 20, 2015 3:31:10 GMT
Hi guys, i finally got to try the franken-ember setup everyone has been raving about. The thing is it is awfully quiet. I sourced the 7193 to 12ax7 converter from ebay and the 7193 tubes were graciously given to me by Demo3. I've set my computer sound to 100%, the project ember itself is also 100%. Yet it still isn't loud enough. Do you guys have any advice on how to solve this issue? Is the converter faulty? Or is it some other issue? Also if it helps, the project ember version im using right now is version 1. Cheers!
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solderdude
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Post by solderdude on Aug 20, 2015 5:35:23 GMT
With the output R set to 'low' and the gain in it's highest setting it SHOULD have enough amplification.
Of course this depends on the input level (output level of the source), efficiency of the headphones but above all the tube.
The amplification of the amp is solely determined by the tube itself not by feedback as in most other designs.
A tube with a relatively low amplification will thus play softer.
This difference can easily be 10dB compared to other tubes.
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Post by skyline on Aug 20, 2015 14:17:34 GMT
Frans, what is the cost in converting a v1 Ember to a v2 if it already has the supercharger?
The input attenuation module and less scratchiness on the volume pot are both pretty cool upgrades.
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solderdude
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Post by solderdude on Aug 20, 2015 15:06:09 GMT
that will depend on whether you want it done or plan to do it yourself.
The scratchiness mod consists of cutting 2 traces (one for L, one for R) and mounting a small SMD resistor over that 'broken trace'.
Fiddly job but do-able IMO.
Could write a tutorial and try it on my own amp to take pictures of the process.
Adding the attenuation module will be somewhat of a DIY thing.
I could make very small PCB's (but would be green) that one could solder in that spot and have a socket on board that takes the modules.
Such a PCB would cost around 3 to 4 Euros included shipping (assuming I make and sell 50 of these PCB's.
Should I only make a batch of 20 they will be around 5 to 6 Euros.
You would only need to have DIP sockets.
Another idea may be a small modification of the Supercharger circuit.
It involves 'lifting' pin 5 of the IC + adding 2 resistors and a small cap.
This will 'delay' the supercharger switch on and limit the inrush current of the amp as the inrush for the regulator can now come from charged capacitors and already closed power switch contacts.
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olindh
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Post by olindh on Aug 20, 2015 15:32:38 GMT
Hi guys, i finally got to try the franken-ember setup everyone has been raving about. The thing is it is awfully quiet. I sourced the 7193 to 12ax7 converter from ebay and the 7193 tubes were graciously given to me by Demo3. I've set my computer sound to 100%, the project ember itself is also 100%. Yet it still isn't loud enough. Do you guys have any advice on how to solve this issue? Is the converter faulty? Or is it some other issue? Also if it helps, the project ember version im using right now is version 1. Cheers! That adapter probably needs some modifications for it to work with the Ember. Otherwise you will need the Garage1217 12au7 --> 6sn7 adapter and the 6sn7 --> 7193 adapter from ebay. |
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obo78
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Post by obo78 on Aug 20, 2015 18:45:26 GMT
that will depend on whether you want it done or plan to do it yourself. The scratchiness mod consists of cutting 2 traces (one for L, one for R) and mounting a small SMD resistor over that 'broken trace'. Fiddly job but do-able IMO. Could write a tutorial and try it on my own amp to take pictures of the process. Adding the attenuation module will be somewhat of a DIY thing. I could make very small PCB's (but would be green) that one could solder in that spot and have a socket on board that takes the modules. Such a PCB would cost around 3 to 4 Euros included shipping (assuming I make and sell 50 of these PCB's. Should I only make a batch of 20 they will be around 5 to 6 Euros. You would only need to have DIP sockets. Another idea may be a small modification of the Supercharger circuit. It involves 'lifting' pin 5 of the IC + adding 2 resistors and a small cap. This will 'delay' the supercharger switch on and limit the inrush current of the amp as the inrush for the regulator can now come from charged capacitors and already closed power switch contacts. I'd be very interested in the "scratchiness mod" tutorial and the Supercharger module modification as well. I've already fabricated my own solution to the attenuation module and posted it earlier in this thread. It's no where near as elegant as a PCB solution, but it works. I'd probably buy the attenuation module PCB if you offered it, just to have a cleaner looking fix. Count me in. |
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solderdude
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Post by solderdude on Aug 20, 2015 18:58:33 GMT
The attenuation module idea is indeed based on your idea.
Will discuss it with Jeremy and see what he wants to do.
The PCB is extremely easy to make...
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