Ok, I ripped out the G7 circuit and tried the ELAM. Wow!! big difference on the top end
I quickly recorded myself with the G7 before ripping out it's guts. Then recorded the same thing with the ELAM & the same chain.
Chain was
Mic--->
Baby Animal Pre----->
Analag opto vlave compressor---->
Mytek Converter
Not the most scientific test, but I tried to keep levels, distances, compression etc as close as possible.
There's no EQ on any of the mics, just some compression, and a little bit of delay....................
The song is by "The Script", and the music is just one of those $1.99 karaoke tracks, so I hold no claim to how that sounds....bad or good.......
And, excuse the singing....... It was all done in a rush to see how the mics sounded............
Here's how the G7 sounded
http://twin-x.com/groupdiy/albums/userpics/Script_G7.mp3
And here's the ELAM circuit
http://twin-x.com/groupdiy/albums/userpics/Script_ELAM250.mp3
And as a comparison here's my Royer mod with a Dale M7, and a cinemag CM-2461. Wrong ratio & impedance, but it seems to work.
http://twin-x.com/groupdiy/albums/userpics/Script_Royer_K2.mp3
you will have less bass with an elam circuit and you will have more noise !
It's definitley got more noise/hiss than the G7, but it's not unusable. Works well for vocals. I wouldn't be trying to record quiet sources with it at the moment though.
I've got a couple of GE6072 five star thingys, and I've got the quieter one in there. Mind you 2 valves is not the best selection to sort through and find a quiet one. :
I've had a bit of a search about 6072 vs 6072a, and these are a couple of the things I've found............
6072A is computer rated and has higher leakage resistance than 6072
The 'A' in 6072A is supposed to indicate "low-nopise" but the GL 5 Stars are usually extremely quiet
Would the 6072A generally be quieter than a 6072?? Or again is it one of those things you'll only find out by popping one in.
Also, the MK7 psu has been suggested......and I've been educating myself on "ripple"
Would that bring the overall hiss down?? or is it more to do with the noise level of the tube itself.
The MK7 seems to have a lot more filtering on the heater side of things.