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In Reply to: RE: I think andyr's focus was more cartridge loading vs. gain. nt posted by Tre' on August 09, 2024 at 11:12:09
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Follow Ups:
Sorry, that's simply nonsense.
You made the claim that the cartridge would have needed a 1:15 step up in reply to Lew's post quoting 1:10 as being generally fine for cartridges up to 40 ohms DCR.
You can't talk about the step up gain/ratio for loading without considering the input sensitivity of the main phono amplifier i.e gain. The norm is for a 3mV to 5mV input sensitivity and Benz clearly anticipated a 1:10 transformer with their recommended min load of 470 ohms.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
Sorry, Anthony - but we seem to be talking at cross-purposes.
To me:
* the gain that a cart requires
* is a completely different issue to the loading which delivers the cart's optimal sound.
But that is because I use an active head amp with an MM phono stage - rather than a SUT. Or I use an ss MC phono stage which has the required gain for the LOMC cart.
When I said that a 1:15 SUT would be needed ... it's simple maths. An MM phono stage typically has a 40dB gain (100x) so that a typical 5mV-output MM cart delivers 500mV from the phono stage.
Therefore, a 0.35mV LOMC through a 1:10 SUT will only deliver 3.5mV - so the output from the 40dB MM phono stage will only be 350mV.
To increase the output to 500mV (actually a bit more), you need:
* either a 1:15 SUT (so 0.35 x 15 = 5.25mV ==> 525mV output from the 40dB MM phono stage)
* or a 1:10 SUT with a 43dB gain MM phono stage.
Or of course, an MC phono stage with no SUT/head amp ... and a gain of 63dB.
And re. " Benz clearly anticipated a 1:10 transformer with their recommended min load of 470 ohms " - methinks you have misinterpreted the spec.
It clearly says on the spec sheet that came with my Benz LP " min load 470R ". IOW - minimum !
They don't specify a maximum - but it is interesting to note that Herr Lucaschek ("Mr Benz") produces an MC phono stage which only offers 47k - as that's what he thinks the Benz wood-bodies sound best at.
My own experiments (because I was able to change loading independently of gain) was that 47k gave too loose a bass on my Bob Marley records. 470 ohms was too 'closed in' - but 3300 ohms gave the optimum balance between 'soundstage air' ... and tight bass.
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