howie
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Post by howie on Oct 17, 2015 20:47:11 GMT
gain difference = 12% = 1dB current difference = 13% = 1.05dB Thanks again, Frans. |
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Post by musicman on Dec 2, 2015 21:19:48 GMT
Frans, I was wondering if we can use the 6C5G Radio Vacuum Tubes in the Ember with an adapter. I have an adapter for the 6j5and 6l5g tubes that I use and ran across the 6C5G Radio Vacuum Tubes and wondered if they will work, I have the Ember 1 with the supercharger option installed. Thanks in advance
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solderdude
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Post by solderdude on Dec 4, 2015 5:58:25 GMT
If you have the right adapter they should work.
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Post by tunkejazz on Dec 5, 2015 19:44:11 GMT
After skimming though lots of tubes on ebay, I managed to find a cheapish 6n2p and a 6n1p from the 60s'. Looking forward to try them, I am quite impressed with my 6n23p, so far the best of all the "small" tubes that I have tried!
Would something like a 6n5p or 6n26p work on the Ember II? Any experience with them?
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howie
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Post by howie on Dec 5, 2015 22:15:12 GMT
I believe some 6n5p's are the equivalent of 6CG7/6FQ7. If so it will work. I have an Ei 6CG7 which performs very well indeed with Ember. I've also heard an RCA which wasn't so good. Basically, I think it's like a 6SN7 with 9 pins, so you save having to buy an adapter. I was actually listening with the Ei an hour ago with my new modded Philips-very nice indeed!
Sorry, don't know about the 6n26p.
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Post by tunkejazz on Dec 5, 2015 23:14:59 GMT
I believe some 6n5p's are the equivalent of 6CG7/6FQ7. If so it will work. I have an Ei 6CG7 which performs very well indeed with Ember. I've also heard an RCA which wasn't so good. Basically, I think it's like a 6SN7 with 9 pins, so you save having to buy an adapter. I was actually listening with the Ei an hour ago with my new modded Philips-very nice indeed! Sorry, don't know about the 6n26p. Thanks Howard! Listening to the modded Philips here too :-) |
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Post by musicman on Dec 7, 2015 2:54:13 GMT
If you have the right adapter they should work. Thanks for the info Frans, they work fine, a little warm with the 650's but they do sound good. |
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howie
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Post by howie on Dec 7, 2015 10:45:50 GMT
If you fancied exploring the 6J5's a bit more you might like the slightly cooler sounding Pinnacle 6J5's with your HD650's.
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Post by musicman on Dec 9, 2015 2:18:05 GMT
Did anyone see this forum post..............http://www.diyaudio.com/forums/headphone-systems/279341-hissing-problem-hybrid-amp.html#post4541743 ? Altering Ember pcb, wonder if that is against his warranty?
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howie
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Posts: 158
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Post by howie on Dec 21, 2015 22:30:21 GMT
I have a question that's been bothering me for a while. Does the gain of the tube affect the maximum power output from the amp or does the gain of the tube just allow an appropriate usage of the vol pot ie lower gain to be able to use more of the vol pot?
For instance when say looking at Starlight's power vs headphone impedance graphs in the manuals would those graphs alter according to the mu of the tube or does it make no difference?
Thanks.
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solderdude
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Post by solderdude on Dec 23, 2015 9:55:26 GMT
The (max) output power is determined by the power supply voltage (either 24V or 48V in G1217 amps) and the topology of the output stage (SR/Horizon, Starlight or Ember/polaris/solstice) as well as the load impedance (the lower the impedance of the headphone the lower the max output voltage will be) as well as the output R setting.
The type of tube only has a very, very small influence on the max output power (think a few percent) because of the way the autobias circuit is constructed.
The gain of the tube determines how much input voltage is needed to reach maximum output voltage (power) with the volpot in a given position.
So with a low gain tube you either need to have a higher input voltage or set the volume control a bit 'higher' to reach the same output level than when a high gain tube is used.
Both tubes will be able to reach the same (max) output level but when using a low gain you need to have the volpot set in a higher position than with a higher gain tube.
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howie
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Post by howie on Dec 23, 2015 10:13:11 GMT
That's cleared that up. Thanks.
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howie
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Post by howie on Dec 31, 2015 10:58:38 GMT
Good morning Frans.
An eBAY seller has mistakenly sent me two 6BX7 tubes instead of a 6F8G.
I would have liked to try the 6BX7 as it appears to be a high gain 6SN7 type tube but it has a heater current of 1.5A. Am I correct in believing this will be too high for any of the G1217 amps, except maybe Solstice?
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solderdude
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Post by solderdude on Dec 31, 2015 11:50:40 GMT
The heater current does exceed the normal range for the heater supply.
Should this be the only tube you would ever going to use one could alter some values in the heater supply so 1.5A could be reached.
The temperature of the heater power supply may get hotter though.
You could try and pop it in and see if the heater lights up normally.
If it goes on-off-on etc. then wouldn't bother.
If the heater goes on and off 2 or 3 times and then stays on you could switch it off after a few mins and touch the components of the heater supply.
When they get VERY hot I would not risk it.
Personally I wouldn't want to use them though.
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howie
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Post by howie on Dec 31, 2015 20:11:12 GMT
Thanks Frans. I'll take your advice and not try them.
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