There's only one way to find out, but I would think it would be more noticable going into a solid state pre-amp than a tube based one.
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There's only one way to find out, but I would think it would be more noticable going into a solid state pre-amp than a tube based one.
Having tried this now in various guises; gain stage - triode and pentode operation, buffer (cathode follower) operation, and finding very clean and transparent performance, I have added a couple more valves to try and give some 'tubiness' to the sound.
I have fitted a couple of 6418 miniature pentodes, wired as triode gain stages before the 6J1's in buffer configuration.
Looking at the spec sheet for the 6418 they show quite a lot of harmonic distortion, but listening through it gives a very satisfactory sound at typical CD levels.
http://i601.photobucket.com/albums/t...r/P1030677.jpg
I think it's possibly what you wanted now Oliver :D
Cool. I'm still waiting on mine to show up. The transformer is here, but that's the last piece I need. I should just do it point to point.
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Posted this on the Wam 5 years ago. I am amazed the ebay link works now. It was about £50 then I am sure. High end then:D It broke very quickly unfortunately. One channel went.
http://www.ebay.co.uk/itm/Valve-Clas...item1c27c0be9d
Put this in front of the A500, with the volume pots on the A500 reduced, ignoring all the stuff about the distortion the Behringer pots introduce. Then rip out the Russian 6922 and put a Tesla gold-pin E88CC from 1972 in the headphone amp. If you ask, I'll sell you the Tesla, as I have one spare.
The Tesla gives mad but good imaging in that precise headphone amp - dunno why but they do. I know cos I have done it and the results are surprisingly entertaining. I really enjoyed it feeding my little M&Ds. If the imaging gets a bit too insane, shove a Mullard 6922 in it, which I can also supply.
Just ordered me a quad of the Teslas for the EAR preamp. Be interesting to see how they work in it.
Obviously you need to use the headphone jack output into the Behringer, in case you were wondering. And don't blame me if the headphone amp stops working as mine eventually did.
Trust me the results are REALLY nice - much better than you would expect. Much, much better.
I don't think I could mount a Mullard on a PCB. That seems like sacrilege.
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They sent me the wrong boards. This looks like a SRPP driver board. It should serve the same purpose. A wall wart isn't going to drive this one.
https://uploads.tapatalk-cdn.com/201...c7496dbc2a.jpg
https://uploads.tapatalk-cdn.com/201...795da93aac.jpg
It's not is it.
Unlucky.
I ordered one full kit and some of the boards. Maybe the full kit will be right.
This one doesn't look bad, but the transformer won't be cheap. I'll have to try and find a surplus one.
I got the full kit today. The components look decent. It's definitely got more than $10 worth of parts in the bag.