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In Reply to: RE: CartridgeCompatibility posted by Awe-d-o-file on January 11, 2017 at 08:14:16
The LS 37 was a stuffed board. I added the HV power supply (an old Lamda SS) and heater supply. I also recapped it.
I saw the other threads on the LS 37 about swapping out the 12AX7 for an AU7 and such. It might be an option. I am pretty sure there is no gain adjustment. There may be a way to change the gain on the board somehow. There is a schematic somewhere. I will try to locate it.
That MM stage has more than adequate gain for the majority of MM/MI, and high output MC carts.. The additional 12AX7 MC gain stage (looks like grounded grid, with a large lytic as input coupling cap that has been bypassed with small film - cap quality here is critical) might make the the signal to noise ratio more compromised compared to a properly set up high quality step-up transformer.. But you could still try that MC pre stage with a low output MC, just to hear it for yourself first..
I've seen the schematic and there is no way to change he gain. That's why people use different tubes to do it. We still don't know the gain which is essential to predict a carts performance. Also whether you use a passive or active linestage plays a huge role too.
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
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