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Anthem Pre1 failure
Anthem Pre1 failure
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Old 16th February 2019, 03:11 PM   #1
tlcconsultant is offline tlcconsultant  Italy
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Default Anthem Pre1 failure

Hello,
After 20 years of operation, my ANTHEM PRE 1 preamplifier is failure. The fuse in the power supply is blown. Does anyone have an electric schematic? I tried to contact Anthem and Partconnexion but I had no answers.
Thank you
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Old 17th February 2019, 03:43 AM   #2
Tjj226 is offline Tjj226
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Has the fuse blown once, or does it keep blowing new fuses?
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Old 17th February 2019, 08:22 AM   #3
tlcconsultant is offline tlcconsultant  Italy
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Hello,
The new fuse also burns. I'll have to do checks.
For this reason I would like to have a schematic diagram.
Thank you.
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Old 17th February 2019, 08:50 AM   #4
KatieandDad is offline KatieandDad  United Kingdom
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You can do some simple checks without any schematics.

Disconnect all secondary wires from the mains transformer and try again. If the fuse still blows then the transformer is shot.

Does it have semiconductor or valve rectifiers ?
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Old 17th February 2019, 10:08 AM   #5
tlcconsultant is offline tlcconsultant  Italy
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if it were, such as replacing the transformer without the data of the electric diagram?
In the power supply module there are a GZ34 and two solid state graetz rectifier (4 integrated diodes each).
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Old 17th February 2019, 11:40 AM   #6
petertub is offline petertub  Sweden
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Anthem Pre1 failure
One could as a starter examine the power caps, startig with the B+ ( high voltages ).
One quich test is to pull the GZ34 and see if the fuse blows. If not you could

follow the B+ chain where the power caps are a suspect.
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Old 18th February 2019, 02:53 PM   #7
KatieandDad is offline KatieandDad  United Kingdom
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We're not asking you to replace anything yet, get getting a feeling as to where the fault might lie.
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Old 18th February 2019, 04:02 PM   #8
tlcconsultant is offline tlcconsultant  Italy
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Today and tomorrow I will certainly not have time to do some tests. As soon as I start I will communicate the results here. For the moment, I thank all those who answered me
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