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ZMC1 Step Up Gain (Read 2374 times)
Archie
Seasoned Member
Posts: 2731
ZMC1 Step Up Gain
10/15/21 at 17:43:31
I'd like to get a "once and for all" answer to the question of how much the ZMCs increase the cartridge signal. Steve seems to list contradictory specs.
From the ZMC web page:
ZMC1
For low output MC cartridges
1:20 ratio for use with 3~25 ohm cartridges.
ZMC2
For high output MC cartridges
1:10 ratio for use with 3~100 ohm cartridges.
ZMC3
For high impedance MC cartridges
1:12 ratio for use with 25~100 ohm cartridges.
In the current ZP3 Manual he lists:
GAIN
The ZP3 has apron 43dB of gain for use with moving magnet cartridges. The ZMC
step up transformers add around 20dB for use with moving coil cartridges.
And finally, on the ZP3 web page he lists:
Gain + 42 dB
With optional step up transformer + 61dB
I've always taken the gain for the ZMC1 as 20X which is 26 dB, I think. The ZMC2, with 10X gain corresponds to a +20 dB gain.
Can anyone confirm this? Steve? The way my 0.34 mV MC cart plays with my ZMC1 into my ZP3 leads me to believe that I'm correct and the ZMC1 gain is 20X or 26 dB but confirmation sure would be nice.
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ZLC
Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
Homemade Big Betsy Speakers (F15s)
Silver Cabling
DIY Isolation platforms under amps & TT.
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Crazy Bill the Eel Killer
Seasoned Member
Tubes Rule !!
Posts: 238
Re: ZMC1 Step Up Gain
Reply #1 -
10/15/21 at 19:38:32
Hello Archie,
Your gain calculations are correct.
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Archie
Seasoned Member
Posts: 2731
Re: ZMC1 Step Up Gain
Reply #2 -
10/15/21 at 19:41:34
So, which do you think it is for the ZMC1, 20X (26dB) or 20dB? I'm guessing the first.
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ZLC
Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
Homemade Big Betsy Speakers (F15s)
Silver Cabling
DIY Isolation platforms under amps & TT.
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Edsonic
Seasoned Member
Posts: 154
Re: ZMC1 Step Up Gain
Reply #3 -
10/17/21 at 16:36:37
No specific model of ZMC was cited, but the numbers given fit to the ZMC2.
Gain in dB of DW SUTs is; ZMC2- 20dB, ZMC3- 21.6dB, ZMC1- 26dB.
Total gain of ZP3 (42dB) plus SUT would be, in ascending order of gain: 62, 63.6 , and 68 dB.
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Archie
Seasoned Member
Posts: 2731
Re: ZMC1 Step Up Gain
Reply #4 -
10/17/21 at 19:30:52
I agree that it seems to fit the ZMC2 but since most seem to use the ZMC1, I'd think Steve would post clear specifications for that one too -- or all three, even better. I think my confusion started when he began posting a dB spec for the ZMCs. When he only listed 20X, 10X and 12X it was clear, if not non-standard (since dB is commonly the way gain is given).
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ZLC
Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
Homemade Big Betsy Speakers (F15s)
Silver Cabling
DIY Isolation platforms under amps & TT.
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CAJames
Seasoned Member
"I've run every
red light on memory
lane."
Posts: 2020
Re: ZMC1 Step Up Gain
Reply #5 -
10/21/21 at 04:17:32
Quote:
Posted by: Archie Posted on: 10/17/21 at 19:30:52
...I think my confusion started when he began posting a dB spec for the ZMCs. When he only listed 20X, 10X and 12X it was clear, if not non-standard (since dB is commonly the way gain is given).
It seems like you have it figured out, but FTR the formula is:
dB = 20 x log (gain)
so for 20X step up you get:
dB = 20 x log (20)
= 20 x 1.3
= 26 dB
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Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Maple-tree Phono 3E
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