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Holfi Battriaa strange issue
Holfi Battriaa strange issue
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Old 11th September 2017, 04:01 PM   #11
DF96 is offline DF96  England
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OK, but the junction of the reservoir caps should have something connected to it too. Unless they want buzz due to charging pulses, the CT should connect to the cap junction. Then any ground should come from there, not the secondary. However, drawing this wrongly is quite common in commercial circuits; sadly, connecting it wrongly is not as rare as it should be.
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Old 11th September 2017, 04:47 PM   #12
mckaymckaymckay is offline mckaymckaymckay  United Kingdom
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Ok, ill recheck everything.
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Old 12th September 2017, 09:04 AM   #13
mckaymckaymckay is offline mckaymckaymckay  United Kingdom
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Thanks DF96, i resolved the issue last night, it was nothing to do with the amp.

The holfi battriaa i have uses 3 pins at the back to select whether its MC or MM cartridge you are using. These pins are shorted with a small wire, rather than just using a switch. One of the solder joints was slightly loose so i reflowed it and no more feedback from tapping the casing.

Who would have thought!
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Old 12th September 2017, 10:54 AM   #14
DF96 is offline DF96  England
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OK. The next thing I was going to suggest was putting the old caps back in and see if the problem goes away.
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Old 12th September 2017, 11:08 AM   #15
mckaymckaymckay is offline mckaymckaymckay  United Kingdom
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Yes i did contemplate that if it didnt work. The mundorf caps have changed the sound quite significantly on the Tosh unit!
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Old 11th January 2019, 09:52 PM   #16
tiefbassuebertr is offline tiefbassuebertr  Germany
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are there a schematic diagram available ?
What is the aim of the wooden parts (square edges made of solid wood) - go to the images under
www.avmentor.gr - Reviews: Holfi Batt2riaa phono preamplifier

Last edited by tiefbassuebertr; 11th January 2019 at 09:56 PM.
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