Hi,
After many year of service, I am upgrading my Beard P100 power amp. I will be installing ClarityCap SA series 0.1uF bypass capacitors on the power suply of both channels and will be replacing the DC coupling caps between the tube amplification stages to ClarityCap SA series caps. One issue I have is that the capacitors between the first and second amplification stage is 0.022uF. I could not find a ClarityCap SA of the same value. Can I replace the 0.022uF caps with 0.1uF caps instead. What would be the effect of such a change?
Are there any other changes you would recomend?
thanks
Ronen
After many year of service, I am upgrading my Beard P100 power amp. I will be installing ClarityCap SA series 0.1uF bypass capacitors on the power suply of both channels and will be replacing the DC coupling caps between the tube amplification stages to ClarityCap SA series caps. One issue I have is that the capacitors between the first and second amplification stage is 0.022uF. I could not find a ClarityCap SA of the same value. Can I replace the 0.022uF caps with 0.1uF caps instead. What would be the effect of such a change?
Are there any other changes you would recomend?
thanks
Ronen
ronenash said:
With regard to bypass capacitors, there is a current thread on the forum with opinion divided as to whether this is a good thing. My advice would be 'Try it and see if it changes things for the better!'
Changing the values of the caps from 0.022 to 0.1uF will alter the LF rolloff point but will do no harm.
Ideally, you should check and replace all components that are outside the original spec. or are showing signs of aging.
Andy
Beard P100
Hello I have recently purchsed a Beard P100 power amplifier, does anyone know the correct valve order. Looking from the front (beard P100 logo infront of you) to back of the amplifier I have e82cc on the left and right sides. Then I have e81cc on the left and e83cc on the right in the second row, and on the third row I have e83cc on the left and e81cc on the right? then the Kt88 after. Does anyone know which is the correct order. Below is the order of my valves at the moment
KT88 KT88
KT88 KT88
e83cc e81cc
e81cc e83cc
e82cc e82cc
If anyone has a manual or ideally schematic could they send it to me please.
Also does anyone know what the two variable resistors are for on the inside of the amplifier by 33uF capacitor and the preamp valves on the PCB are for, and what upgrades would you recommend.
Hello I have recently purchsed a Beard P100 power amplifier, does anyone know the correct valve order. Looking from the front (beard P100 logo infront of you) to back of the amplifier I have e82cc on the left and right sides. Then I have e81cc on the left and e83cc on the right in the second row, and on the third row I have e83cc on the left and e81cc on the right? then the Kt88 after. Does anyone know which is the correct order. Below is the order of my valves at the moment
KT88 KT88
KT88 KT88
e83cc e81cc
e81cc e83cc
e82cc e82cc
If anyone has a manual or ideally schematic could they send it to me please.
Also does anyone know what the two variable resistors are for on the inside of the amplifier by 33uF capacitor and the preamp valves on the PCB are for, and what upgrades would you recommend.
traf said:Craig
Did you ever receive the schematic I emailed you? If not get back in touch.
The two VRs balance the current flowing on each side of the push/pull circuit. Simply adjust such that there is 0V across it.
From a now ex- Beard P100, P101, P505 and CA506 owner
Simon
Simon,
Please could you mail me a copy of the schematic.
I did request a copy from RONENASH but never received it.
Andy
cocosal said:
Ruben
I don't have a schematic for my old P505mk2 but do remember the valve layout being
Left Centre Right
Back ECC82 ECC83 ECC83
Middle CV4085 ECC83* ECC83*
Front CV4085 ECC83 ECC83
* The middle ECC83s can be replaced by ECC81 for slightly lower gain.
The 2 CV4085s can of course be replaced by EF86s
Traf,
Thanks for this important information for me.
You recomend the replace for midle ecc83 to ecc81?
I'm a "valve beginner"....
The original GEC/Mullard/Brimar (I'm not sure) is very, very rare and expensive....what your opinion brand of replacement?
Electro-Harmonix?
Very, very thanks for your help....
Best regards,
Ruben from Uruguay (a nice little country-Latin América)
Thanks for this important information for me.
You recomend the replace for midle ecc83 to ecc81?
I'm a "valve beginner"....
The original GEC/Mullard/Brimar (I'm not sure) is very, very rare and expensive....what your opinion brand of replacement?
Electro-Harmonix?
Very, very thanks for your help....
Best regards,
Ruben from Uruguay (a nice little country-Latin América)
Ruben
Personally, I'm a big fan of JAN GE 5751s as a substitute for ECC83s and these can be picked up pretty cheaply on ebay. They have slightly lower gain than the ECC83, but this should only be a problem if you have a particularly low output MC cartridge. Otherwise, out of current production the EH is fine.
Substituting the middle ECC83 for ECC81 only reduces the overall gain slightly - I never noticed a particular change in tone. Mullard CV4024s (milspec ECC81s) are still reasonably cheap so this makes better sense than spending $$$ on another pair of Mullard ECC83s or CV4004s!
If you need any GEC CV4085s and Mullard CV4024s (or indeed have trouble finding some 5751s) I have a few NOS which I never got around to using in the P505. pm me if you need any
cheers
simon
Personally, I'm a big fan of JAN GE 5751s as a substitute for ECC83s and these can be picked up pretty cheaply on ebay. They have slightly lower gain than the ECC83, but this should only be a problem if you have a particularly low output MC cartridge. Otherwise, out of current production the EH is fine.
Substituting the middle ECC83 for ECC81 only reduces the overall gain slightly - I never noticed a particular change in tone. Mullard CV4024s (milspec ECC81s) are still reasonably cheap so this makes better sense than spending $$$ on another pair of Mullard ECC83s or CV4004s!
If you need any GEC CV4085s and Mullard CV4024s (or indeed have trouble finding some 5751s) I have a few NOS which I never got around to using in the P505. pm me if you need any
cheers
simon
beard p505 pre mk1 we think
traf you said you had a beard p505 im needing some help please new valves problems switching on left channel power supply suspect would love to upgrade valves in machine are
rca usa 5751 5 off
mullard ecc81 12at7 2 off
gec cv4085 kb/2^7124 2 off
any help or info would be great thanks for your time or anybody
traf you said you had a beard p505 im needing some help please new valves problems switching on left channel power supply suspect would love to upgrade valves in machine are
rca usa 5751 5 off
mullard ecc81 12at7 2 off
gec cv4085 kb/2^7124 2 off
any help or info would be great thanks for your time or anybody
hi vdub
I had a Mk2 which is a bit different to the Mk1 (the Mk1 had a iflter switch on the far right - the Mk2 had a mon switch, and I suspect the internal circuitry is slightly different.
I'm slightly puzzled by the valves you have fitted - in particular the 5x5751s. I was expecting to see and ECC82 or CV4003 in there somewhere (back left corner looking from the front?), assuming the Mk1 has an output buffer stage after the CV4085s like the Mk2.
If you do suspect any of the valves may be duff, its worth swopping left/right pairs around to see when the problem switches channel. This should identify the culprit pretty quickly.
I would also drop Chris Found an email via www.beardaudio.com
He used to work for Bill Beard and should be able to tell you the exact valve configuration for the Mk1.
(if you need some new mullard CV4004 and CV4003 you know who to ask... )
simon
I had a Mk2 which is a bit different to the Mk1 (the Mk1 had a iflter switch on the far right - the Mk2 had a mon switch, and I suspect the internal circuitry is slightly different.
I'm slightly puzzled by the valves you have fitted - in particular the 5x5751s. I was expecting to see and ECC82 or CV4003 in there somewhere (back left corner looking from the front?), assuming the Mk1 has an output buffer stage after the CV4085s like the Mk2.
If you do suspect any of the valves may be duff, its worth swopping left/right pairs around to see when the problem switches channel. This should identify the culprit pretty quickly.
I would also drop Chris Found an email via www.beardaudio.com
He used to work for Bill Beard and should be able to tell you the exact valve configuration for the Mk1.
(if you need some new mullard CV4004 and CV4003 you know who to ask...
)simon
The Meridian 605 DC detection is very sensitive.
It's a DC coupled amp so needs to be so it can shut down quickly if DC appears at the output.
You're preamp is giving enough DC on power up to trigger the 605 protection. Quite common really for upstream components to trigger them in this way and on power off too.
It's a DC coupled amp so needs to be so it can shut down quickly if DC appears at the output.
You're preamp is giving enough DC on power up to trigger the 605 protection. Quite common really for upstream components to trigger them in this way and on power off too.
beard p505 mk1
hi ,
does anybody have a p505 mk1 in this forum or know anybody with a mk1 that i can get the valve layout
tried chris at beard to no help will not give valve layout
but will look at the amp if i posted it ???
thanks for your help jim
also looking for gec 4085 2 off can anybody out there help
sorry to keep crashing this thread but its the only way i can and get any help
i dont have permission yet
hi ,
does anybody have a p505 mk1 in this forum or know anybody with a mk1 that i can get the valve layout
tried chris at beard to no help will not give valve layout
but will look at the amp if i posted it ???
thanks for your help jim
also looking for gec 4085 2 off can anybody out there help
sorry to keep crashing this thread but its the only way i can and get any help
i dont have permission yet
hi vdub
I had a Mk2 which is a bit different to the Mk1 (the Mk1 had a iflter switch on the far right - the Mk2 had a mon switch, and I suspect the internal circuitry is slightly different.
I'm slightly puzzled by the valves you have fitted - in particular the 5x5751s. I was expecting to see and ECC82 or CV4003 in there somewhere (back left corner looking from the front?), assuming the Mk1 has an output buffer stage after the CV4085s like the Mk2.
If you do suspect any of the valves may be duff, its worth swopping left/right pairs around to see when the problem switches channel. This should identify the culprit pretty quickly.
I would also drop Chris Found an email via Welcome to Beard Audio Support Site
He used to work for Bill Beard and should be able to tell you the exact valve configuration for the Mk1.
(if you need some new mullard CV4004 and CV4003 you know who to ask...
simon
hi you said a long time ago about offering these 2 valves
(if you need some new mullard CV4004 and CV4003 you know who to ask...
)but have 2 different codes 12ax7 and 12au7 does these work the same way or ??????? any help would be great cheers jim