rmouser
Multiple accounts (thunderhead)
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- Feb 27, 2009
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It sounds like the two connectors on the top may be reversed. Turn off the amp and reverse them.
It sounds like the two connectors on the top may be reversed. Turn off the amp and reverse them.
@melkenshawn I think I have the solution for your quiet dual 7193's:
* Orientate the 7193 adapter so that the G-cap markings are in front of you and the A-cap markings are furthest away.
Connect both G-cap wires to the to the outside caps of both 7193 tubes, and
Connect both A-cap wires to the inside of both tubes
- sometimes although the wires on top are on the caps, they can actually be loose, so you may want to either try twisting the wire on top a bit until it sounds connected better (careful take the headphones off for the loud popping sound), or try cleaning the connections with electrical oil
* Set the Ember to high gain, by removing the panel and moving the position of the dip switch in the rear, towards the right.
If these still don't work, then either your tubes are bad, or the adapter is not right.
IIRC, you may be one of the first to try the 1 adapter method, while most of us are using both 12ax7 to 6sn7 AND 6sn7 to 7193 adapters
I have a 12AU7 to 7193 adapter that is in the US--should see it soon. It is supposed to run in amps with manual voltage selection. I have a Sunrise 2 to try it. Frans states that there is a problem with the auto voltage sensing that does not occur with the 6SN7 to 7193 adapter,
I have a 12AU7 to 7193 adapter that is in the US--should see it soon. It is supposed to run in amps with manual voltage selection. I have a Sunrise 2 to try it. Frans states that there is a problem with the auto voltage sensing that does not occur with the 6SN7 to 7193 adapter,
Oh well if you finally get it, please comment here so i know if the problem lies in the adapter. Thank you.
The 12AU7 to 7193 adapter arrived today. The quality and workmanship is actually very good.
It did not work in the Sunrise 2; quiet just like the Ember--6 or 12 volt setting. The heater filaments both glowed though.
I whipped out the DVM and went to town. What I found is that pins 5 and 4 were jumpered and went to one of the 7193 heater pins and pin 9 went to the other heater pin. The heaters are wired in series. I cut the jumper and moved the pin 9 wire to pin 4.
Tried it in the Sunrise first and they biased nicely at 12 volts. Sounded great.
Moved it to the Ember and the auto bias worked flawlessly. Sounds phenomenal.
So now the adapter works back and forth between the amps, HOWEVER, it is about 1/4 inch too short to clear the output caps. I was prepared for that as I have two 9 pin socket savers.
I have been soldering computer motherboards and other electronics for three decades and have an industrial grade soldering station and it was not easy.
Irony--it seems the 6DJ8 will work, I "flipped a coin" and the 12AU7 "won"--go figure
[COLOR=000000]The 12AU7 to 7193 adapter arrived today. The quality and workmanship is actually very good.[/COLOR]
[COLOR=000000] [/COLOR]
[COLOR=000000]It did not work in the Sunrise 2; quiet just like the Ember--6 or 12 volt setting. The heater filaments both glowed though.[/COLOR]
[COLOR=000000] [/COLOR]
[COLOR=000000]I whipped out the DVM and went to town. What I found is that pins 5 and 4 were jumpered and went to one of the 7193 heater pins and pin 9 went to the other heater pin. The heaters are wired in series. I cut the jumper and moved the pin 9 wire to pin 4.[/COLOR]
[COLOR=000000] [/COLOR]
[COLOR=000000]Tried it in the Sunrise first and they biased nicely at 12 volts. Sounded great.[/COLOR]
[COLOR=000000] [/COLOR]
[COLOR=000000]Moved it to the Ember and the auto bias worked flawlessly. Sounds phenomenal.[/COLOR]
[COLOR=000000] [/COLOR]
[COLOR=000000]So now the adapter works back and forth between the amps, HOWEVER, it is about 1/4 inch too short to clear the output caps. I was prepared for that as I have two 9 pin socket savers.[/COLOR]
[COLOR=000000]I have been soldering computer motherboards and other electronics for three decades and have an industrial grade soldering station and it was not easy.[/COLOR]
[COLOR=000000] [/COLOR]
Irony--it seems the 6DJ8 will work, I "flipped a coin" and the 12AU7 "won"--go figure
LOL you guys shouldn't just be audiophiles, you should also be... electricians, sound engineers, producers, etc. with all those electrical skills!(I'm sure many of us are though)
Anyway please reply back about your impressions of the F.E. 7193 setup. I think it usually sounds better with the caps (not bypassed)
I just ordered my Ember with the 6SN7 adapter.
I have read so much about Sylvania 6SN7GT/6SN7GTA that I would like to order one. The spread in prices on ebay is overwhelming. Any tips to know which one should I get? Also, which flavor is more recommended for deep bass, the 6SN7GT or 6SN7GTA?
I can see tubes from >20 USD to 200 USD!