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Valve Itch phono
Valve Itch phono
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Old 23rd November 2021, 11:28 PM   #3461
Salas is offline Salas  Greece
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Valve Itch phono
Quote:
Originally Posted by merlin el mago View Post
Salas it's normal more gain using the SHURE V15 type III or have I to look for the need of more gain in other place?
With 3.5mV output you should not need more than 43dB in any case. Many MM preamps have 37dB for 5mV carts as standard. 40dB for 3.5mV equals them. The Itch has at least 43dB on healthy tubes. Either the V15 has gone weak (usually its rubber suspension) or it needs more load capacitance to liven up or you need gain elsewhere in the system's chain.
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Old 25th November 2021, 11:37 AM   #3462
merlin el mago is offline merlin el mago  Catalonia
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Thanks Salas, I suspected the same. I will try 1st with more load capacitance. The tubes are ok. The Itch it's connected to 26 preamp with Sic bias, Bartola hybrid Mu-follower, 15K-300R OPT & Dave Slage AVC.

Last edited by merlin el mago; 25th November 2021 at 11:44 AM.
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Old 25th November 2021, 05:46 PM   #3463
Salas is offline Salas  Greece
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Is the power amp's voltage gain and the speakers sensitivity loud enough as well?
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Old 26th November 2021, 11:44 AM   #3464
merlin el mago is offline merlin el mago  Catalonia
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Power amp Mono block Erno Borbely 75W RMS Class A, speakers DIY 86dB or less because the passives filter.

I'm using the 26 with OPT to listen with headphones HD600
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Old Today, 02:35 PM   #3465
merlin el mago is offline merlin el mago  Catalonia
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Salas what about if I use a bypass capacitor at R9 330R?

Last edited by merlin el mago; Today at 02:50 PM.
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Old Today, 07:28 PM   #3466
Salas is offline Salas  Greece
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Valve Itch phono
It would not add anything much. 0.3dB or so. Full Mu stage gain is already achieved. Its a Mu follower.
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