Convert cartridge output voltage to db gain

Actually, the specs on the Avatar SE indicate that its preamp section has a gain of 24db, and its power amp section has a gain of 25 dB ultra-linear and 23 dB triode mode. It also indicates "Maximum input signal: Infinite (attenuation precedes line stage)."

So with the phono stage set for 66db gain, the 0.24mv cartridge output would result in 480mv into the preamp section, which certainly will not overload it (in addition to the quoted statement, additional evidence of that being the fact that it can handle the cdp cleanly).

The 24db of available gain in the preamp section would boost the 480mv to 7.7 volts (into the power amp section) IF the volume control is turned all the way up. However, John indicated that the 2pm position provided a comfortable listening volume, as did the 10am position for the cdp.

I don't see any problem in any of that; all of these numbers, and the volume control settings, seem very reasonable.

I note, though, that the Avatar SE specs indicate 60W/channel, while John mentioned 80W/channel. John, can you clarify?

Best regards,
-- Al

Yeah Al, thanks for pointing that out, I posted that somewhere between 1 & 2am when I was a little too tired and not thinking clearly.

I'd just deleted part of my post just a minute ago, but you responded before I could re-write the whole thing.

Kal, please note the word OR between 1.25 mV cartridge output and 80 db gain phono preamp in my previous post.

Darkmoebius and Al, actually that link shows that my integrated amp is a VAC Avatar Super, NOT the SE version. Your specs are correct for the SE version, the Super is different. The only spec I can find on the Super is the 80 wpc output in ultra-liniear (no triode option). The Super does use different preamp tubes, different driver tubes, and different power tubes. So I don't think I can use the SE gain specs.

My Walker Signature phono stage specs the same as the Reference, and is set for the max gain of 66 db. According to the calculator that Darkmoebius provided, my 0.24 mV cartridge with 66 db of gain outputs a signal of 0.48 V. That would explain the difference in my volume control knob positioning, since my CDP output is 2.5 V, over 5 times the output of the phono stage. Both signals pass through the same line stage and power stage, so I discounted the gain of the integrated amp.

Does this help clarify things?
Again, thanks for the help.

Cheers,
John

Yeah, not a lot you can do about that, except as you've already concluded. 1.25mV cart or up, it seems.

BTW, which cart are you currently using?

And, I forgot say it before, but you've got an awesome system. Bet it's musical as all get-out!

Here's the Avatar Super's manual(.pdf), which has the spec sheet on the 3rd to last page

Have you ever had the chance to compare the Avatar Super's built in MM phono section with anything else? Obviously, at 42dB gain, it doesn't have enough for your current cart.

Yes, there don't seem to be any published specs on the gain of the line stage or power amp section of the Avatar Super, but the manual does indicate, as with the SE, that "attenuation precedes line stage" and consequently there is no practical limit on input voltage.

And if 2.5V from the cdp doesn't overload anything, 480mv from the phono stage certainly won't.

BTW, John, if I may I thought I'd point out that Hdm, to whom you've addressed a couple of comments, is not Kal. Kal is Kr4.

Best regards,
-- Al