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Old 16th January 2012, 09:56 AM   #1841
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balanced input bx500
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Old 16th January 2012, 11:28 AM   #1842
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Quote:
Originally Posted by engel dela pena View Post
balanced input bx500
This is BX500 with balanced input, your schematic is only for bridge two amp channels.
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Old 16th January 2012, 11:41 PM   #1843
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sir mile,
can you just clear once,andrewt issue of R23 and biasing
the 4 pair h900 is pre bias with resistor,how is it this time guys are following 3 ef,nazirdigi 5 pair and how about soerdjanto,all in all please guide us in biasing 3 ef
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Old 17th January 2012, 02:51 AM   #1844
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Hi Apex,
- Can i replace SFA1603 with BYW 29/100?
- Can i replace BAV 21 with BY 299?
Tx,
Regards....
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Old 17th January 2012, 12:43 PM   #1845
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Default TEF H900

Follow schematic with darlington BD681 and 10k preset for biasing, and I suggest balanced input like in BX500 with volume pot.
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___
Hi Apex audio
greetings any particular reason for using BD681 AND balanced input
like BX500 in TEF H900 and is it safe at 70 and 120 volt dc supply rails please
what will be power in 4 ohms and 2 ohms load thinking of making it
warm regards
andrew lebon
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Old 17th January 2012, 04:41 PM   #1846
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Quote:
Originally Posted by Suluh Wibowo View Post
Hi Apex,
- Can i replace SFA1603 with BYW 29/100?
- Can i replace BAV 21 with BY 299?
Tx,
Regards....
It's easy to find replaces, use google
Regards
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Old 17th January 2012, 04:46 PM   #1847
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Quote:
Originally Posted by engel dela pena View Post
sir mile,
can you just clear once,andrewt issue of R23 and biasing
the 4 pair h900 is pre bias with resistor,how is it this time guys are following 3 ef,nazirdigi 5 pair and how about soerdjanto,all in all please guide us in biasing 3 ef
If you can't set bias R23 relace with 7k5.
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Old 17th January 2012, 04:49 PM   #1848
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Quote:
Originally Posted by andrewlebon View Post
Follow schematic with darlington BD681 and 10k preset for biasing, and I suggest balanced input like in BX500 with volume pot.
Regards
___
Hi Apex audio
greetings any particular reason for using BD681 AND balanced input
like BX500 in TEF H900 and is it safe at 70 and 120 volt dc supply rails please
what will be power in 4 ohms and 2 ohms load thinking of making it
warm regards
andrew lebon
I not suggest to use 2 ohms with 4 pairs, on 4 ohms 1200W is maximum power.
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Old 17th January 2012, 06:12 PM   #1849
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by apexaudio View Post
If you can't set bias R23 relace with 7k5.
Finally, accepting that 15k for R23 in that post does not allow the correct range of bias voltage.
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regards Andrew T.
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Old 17th January 2012, 06:50 PM   #1850
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Quote:
Originally Posted by AndrewT View Post
Finally, accepting that 15k for R23 in that post does not allow the correct range of bias voltage.
My mistake, for B500 and H900 R23 is 15k, but for B500TEF and H900TEF R23 is 7k5.
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