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Old 13th July 2011, 05:48 PM   #11
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Location: Athens, Greece
Quote:
Originally Posted by analog_sa View Post
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
Thank you for the schematic.
The amp is working perfectly, no ham or any other kind of noise, although it is connected to 107 dB speakers (avant-garde duo).
I asked the schematic in order to modify some points.
Thanks again.
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Old 16th January 2012, 01:13 PM   #12
Yann44 is offline Yann44  France
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Join Date: Nov 2008
I wish you a Happy New Year,

Sorry, I live in France and my English is not good.
I have a preamp BEARD P500 and I should like to get the schematic.
Please, I would be very happy if somedy can help me to get this schematic.
It is necessary for me to repear this preamp Beard P500.

Thank you
Best regards,

Yann44
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Old 7th October 2012, 05:02 PM   #13
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Iam currently considering building a Beard P35 clone, i was wondering do you have any specification on the transformers ? Both mains and opt.


Regards x3me00
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Old 8th October 2012, 12:22 AM   #14
AJT is offline AJT  Philippines
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Quote:
Originally Posted by attilio.mazzone View Post
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...
try to tighten up the bolts on the power traffo...if that does not help...you will need to dismantle that traffo from the amp and put a wooden wedge(popsicle stick types) between the core and the coil...then dipping into a bath of insulating varnish will kill that noise once and for all...
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Old 9th December 2014, 02:15 AM   #15
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Location: Adelaide South Oz
Quote:
Originally Posted by x3me00 View Post
Iam currently considering building a Beard P35 clone, i was wondering do you have any specification on the transformers ? Both mains and opt.


Regards x3me00
See a few posts back 270V AC secondary on the power tranny to give a VCC of +330V. 6 off EL84 will want 150mA DC minimum for each channel.
EL84 draw 0.76 Amps heater current each => 4.6 Amps + 0.3 Amps for the input/phase splitter, 6.3V @ 5 Amps (min.) for the Heater winding for each channel Double these currents if building a single power supply stereo amp.

A pair of Ultralinear EL84 needs a 8K Raa Output Tranny. 3 pairs will want approx. 8K/3 = 2700 Ohms Raa and a power rating of 55 to 60 watts. Raa=3K3 Output Trannies are reasonably common and would be fine. 43% Ultralinear taps.

Cheers,
Ian
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Old 9th December 2014, 08:33 PM   #16
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Location: Cayman Islands
Hammond 1650K Output Transformer.
50 W
3,400 ct
318 ma.
4-8-16

One Electron BFT-1B Power transformer.

These may work I had them on my list of possibilities.

I have been thinking along similar lines but fixed bias. I admit that power wise one is probably better off at this stage with something like EL34 PP but I like EL84's and all those tubes sure would look pretty
Of course I don't need another amplifier but that never stopped me before.

Andrew
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Old 9th December 2014, 09:12 PM   #17
2SA991 is offline 2SA991  Germany
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Join Date: Jan 2008
Hello
I have restored an Beard BB100 ,and I put in an new transformer.The older ones
Ar make for 220 v and now we have 230 and they smoke up.I have an company
Here in Germany witch can make them for 250
Regards
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