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Valve Itch phono
Valve Itch phono
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Old 11th October 2018, 06:54 AM   #3171
Salas is offline Salas  Greece
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Valve Itch phono
Quote:
Originally Posted by merlin el mago View Post
Salas one DC heater is chassis grounded & the other is floating where the B+ is floating, can be the source of noise?
No, it should not be on B+, in the original psu design there is a heater lift divider across B+ to tap for that purpose (B+470k:220k//47uFground)
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Old 11th October 2018, 12:18 PM   #3172
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Salas.
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Old 11th October 2018, 12:51 PM   #3173
Salas is offline Salas  Greece
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Valve Itch phono
V1 V2 valves (as named in V1.2 schematic) have their heaters connected directly to ground.

V3 V4 have them connected at the lifter between its two resistors. There's no hum by heater lifting. Its there not to allow higher than the tube's max spec for cathode to heater potential which would otherwise happen in the μ follower's top tubes if their heater was directly grounded.
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Old 11th October 2018, 02:11 PM   #3174
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Heaters GND valves V1 V2 aren't connected to signal ground were connected to chassis GND trought SLB so now corrected to:

1-Connected DC heaters valves V1 & V2 to signal GND trought Bus signal GND
2-Bus signal ground connected to chassis trought SLB at the output sockets RCA signal GND only one wire
3-Separate neutral AC mains earth
4-TT GND wire connected to chassis GND in other single point chassis and connected to input sockets RCA signal GND

Waiting to solve the issue
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Old 11th October 2018, 09:15 PM   #3175
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No buzz in headphones, waiting tomorrow to connect the loudspeakers.
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Old 11th October 2018, 09:51 PM   #3176
Salas is offline Salas  Greece
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Very good with headphones, lets see with the full system
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Old 14th October 2018, 07:16 PM   #3177
Salas is offline Salas  Greece
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What happened with buzz when connected to pre+power amp on speakers?
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Old 17th October 2018, 07:03 PM   #3178
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Hi Salas!
I gone through mostly all pages to find some solution for MC without step up transformer. You are more involved in itch to clarify is it possible?
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Old 17th October 2018, 07:17 PM   #3179
Salas is offline Salas  Greece
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The Itch can adequately amplify HiMC or MM cartridges but not MC without SUT or active pre pre like this
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