beardm70mk2-want less b+

beardman · 7th November 2005, 04:57 PM

Hello
can i make my b+ to 300v ..it is now 330v.
my tube dont. last so long
12 el84 tubes ....beard m70 330v b+ and 40mamp for the tube
hope any off you have a answer
thanks ..Bjarne

andyjevans · 7th November 2005, 07:16 PM

The service agent is Chris Found, who can advise you. chris(at)beardaudio.com

chrisfound · 8th November 2005, 02:20 AM

Hi.
There are two possibilities;

1. Change the mains tapping to 250V, this only applies to EI transformer versions, some later units were just 240V.

2. It is possible to limit the voltage by adding large wattage resistors in line with the Output transformer centre tap.

Personally, we have had no problems with valves with this model, the later BB100 and the 101 had even higher supply rails.
We do recommend specially matched valves that can be supplied by us, as some brands of EL84 do not like 300+ volts.

If you wish to email me directly, I can look over the amplifier for you for a nominal fee.

Chris Found
Beard Audio
chris@beardaudio.com

beardman · 8th November 2005, 01:17 PM

Hi
thanks for for the tip..abou b+
my tube used as first were SOVTEK 2 tubes last only 1 month
and 1 last 9 month---
now i use tubes from TUBE AMP DOCTOR --EL84-CZ
i dont now how long they last (only 14 days old)
to CHRIS i will send you a mail.....perhaps you have ideas to upgrade this great amp---i can tell you i love this amp...
ps---the new tube sound a god deal better
best regards
bjarne

7th November 2005, 04:57 PM	#1
beardman diyAudio Member Join Date: Jan 2005 Location: a littlee town in western denmark	beardm70mk2-want less b+ Hello can i make my b+ to 300v ..it is now 330v. my tube dont. last so long 12 el84 tubes ....beard m70 330v b+ and 40mamp for the tube hope any off you have a answer thanks ..Bjarne

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7th November 2005, 07:16 PM	#2
andyjevans diyAudio Member Join Date: Sep 2003 Location: London	The service agent is Chris Found, who can advise you. chris(at)beardaudio.com

8th November 2005, 02:20 AM	#3
chrisfound diyAudio Member Join Date: Jul 2005 Location: London	Hi. There are two possibilities; 1. Change the mains tapping to 250V, this only applies to EI transformer versions, some later units were just 240V. 2. It is possible to limit the voltage by adding large wattage resistors in line with the Output transformer centre tap. Personally, we have had no problems with valves with this model, the later BB100 and the 101 had even higher supply rails. We do recommend specially matched valves that can be supplied by us, as some brands of EL84 do not like 300+ volts. If you wish to email me directly, I can look over the amplifier for you for a nominal fee. Chris Found Beard Audio chris@beardaudio.com

8th November 2005, 01:17 PM	#4
beardman diyAudio Member Join Date: Jan 2005 Location: a littlee town in western denmark	Hi thanks for for the tip..abou b+ my tube used as first were SOVTEK 2 tubes last only 1 month and 1 last 9 month--- now i use tubes from TUBE AMP DOCTOR --EL84-CZ i dont now how long they last (only 14 days old) to CHRIS i will send you a mail.....perhaps you have ideas to upgrade this great amp---i can tell you i love this amp... ps---the new tube sound a god deal better best regards bjarne

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