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Old 15th November 2009, 08:57 AM   #1
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Default Beard p35mkII schematics/photo photo

Hello
i have need of photos of the one beard p35mkII
photos of the inside transformers (power and output)
because my p35 have one hum noise and i think
that the power transformers was changed ... see the picture



Click the image to open in full size.



Click the image to open in full size.

help me...
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Old 15th November 2009, 10:22 AM   #2
Jaap is offline Jaap  Netherlands
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You already tried changing tubes ?
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Old 15th November 2009, 10:41 AM   #3
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no... but the noise hum in the speakers is very low, very little...
the big noise hum is in the amplifier... it comes from the power amplifier....
also when the speakers are unplugged the hum is strong...
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Old 15th November 2009, 12:13 PM   #4
Jaap is offline Jaap  Netherlands
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I would not advise turning the amp on without speakers connected.
It is difficult (and dangerous) to repair if you lack knowledge but it is also difficult to advise if you have no information. I would first measure voltages/current on strategic places (left and right). Something in the amp could be wrong resulting in excessive current draw. At first sight the powertransformer looks big enough for the job.
Check if your el84's do have glowing/red plates. If so change tubes first.
Measure voltages on the cathode of the el84's, perhaps a voltageregulator is dead or sick.
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Old 15th November 2009, 01:10 PM   #5
Zen Mod is offline Zen Mod  Serbia
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these 7805 are in cathodes as CCS-es

I have schematic somewhere .... maybe I can find it tomorrow and scan ;

but - repair of that amp is still for experienced person
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Old 17th November 2009, 04:20 PM   #6
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Quote:
Originally Posted by Zen Mod View Post
these 7805 are in cathodes as CCS-es

I have schematic somewhere .... maybe I can find it tomorrow and scan ;

but - repair of that amp is still for experienced person

yes 7805 is for automatic bias...
i can not fix it myself.... but the schematic is very necessary...
in the schematic is write the value of the power transformer?

thank you very very much
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Old 17th November 2009, 04:25 PM   #7
Zen Mod is offline Zen Mod  Serbia
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unfortunately - all I have ( and still didn't found that paper ) is sketch by hand of amplifier,without any information about xformer .

I remember there are voltages , but nothing about exact xformer .
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Old 17th November 2009, 05:22 PM   #8
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sin.. web site for buy the schematic?
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Old 13th July 2011, 12:43 PM   #9
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Quote:
Originally Posted by Zen Mod View Post
unfortunately - all I have ( and still didn't found that paper ) is sketch by hand of amplifier,without any information about xformer .

I remember there are voltages , but nothing about exact xformer .
Is the sketch available?
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Old 13th July 2011, 02:23 PM   #10
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So you are not getting hum, but buzz, right? Schematic will be of no use for this, rather build a simple DC blocker.

270v AC 330vDC
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File Type: jpg beardP35.jpg (322.8 KB, 437 views)

Last edited by analog_sa; 13th July 2011 at 02:26 PM.
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