DIAMOND DIFFERENTIAL INPUT POWER AMPLIFIER EBay kit - Page 2 - diyAudio
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Old 16th March 2011, 09:14 AM   #11
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Has someone finished this amp? l would like to share experiences on buildind this..l have the impression this will not work :-)
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Old 16th March 2011, 09:15 AM   #12
poler is offline poler  United States
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i'm curious as well
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Old 16th March 2011, 10:50 AM   #13
janusz is offline janusz  Australia
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Which amp are you referring to? The kit from tubeshunter/jims audio or Sansui or ...?

The board version I got is 1.4. Tubeshunter sold 12 of these so far going back to November.

cheers,
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Old 16th March 2011, 11:10 AM   #14
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Mine is from tubeshunter..v1.4..have you some documentation from the seller? l donīt receive it wiht the kit..incomplete parts too :-( ..can somebody help me?
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Old 16th March 2011, 08:15 PM   #15
poler is offline poler  United States
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the kit of course, so did you finish it ? how does it sound?
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Old 16th March 2011, 09:41 PM   #16
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No, l had not finished yet....
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Old 16th March 2011, 09:42 PM   #17
poler is offline poler  United States
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Sorry I meant it for Janusz
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Old 17th March 2011, 01:35 AM   #18
janusz is offline janusz  Australia
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dinamic1,

My kit came with no notes whatsoever so I wrote to tubeshunter. Below in PS is his response. I have downloaded both circuit diagrams from these addresses.

I haven't built the kit yet. I've asked a friend of mine to run simulation of this amp and this morning I got his reply. It's not a stunning amp like Stochino but pretty good. It's sensitive to the quality of PS. Consequently, I will use regulated PS +/-58V for the voltage stage and double bridge +/-55V for the output.

At 1W THD is 0.000362
h2 = -126dB, h3 =-113dB

R21 must be 220ohm while the simulation showed that zero offset was achieved with R16=195 ohm. It may be better then to leave R28 and W2 in the circuit and preset R16, R28 and W2 to give 195 ohm. When hot one may need to adjust that setting a touch.

cheers,
PS
Dear pradzyndaria,

Hi! 45V-0V-45V power transformer is OK unless you upgrade the voltage rating of some capacitors to 80VDC.

Circuit diagram (Power amp):

http://www.pix8.net/pro/pic.php?u=14821Z2xl&i=11562079


Circuit diagram (speaker protection):

http://www.pix8.net/pro/pic.php?u=14821Z2xl&i=11562080


Note:

1. W2 - omitted

2. "***" = 220 ohm

Adjustment:

1. Apply power but do not install power outputtransistors in this moment, adjust W1 to make 1K (FET drain resistor) to 2.3---2.6VDC

2. Adjust W3 to set the voltage difference between pin 1 & 3 of power output transistor to 0.45V or less. Do not install power output transistor in this moment too!

3. Test the DC offset. Install the power output transistors in case of the output DC offset is 25mV or less. Otherwise check! Adjust W3 and check the voltage drop of 0.22 ohm / 5W resistor. 10mV to 40mV (depends on effiency of the heatsinks) is ideal volatge drop.




- tubeshunter
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Old 17th March 2011, 08:24 AM   #19
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Thank you janusz for that information...līll try to finish the amp...
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Old 17th March 2011, 01:18 PM   #20
forr is offline forr  France
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Hi Janusz,
Thanks for showing a more recent Diamond Sansui circuit than mine.
However I think it was fatal to Sansui, because in search of having a very high slew rate and low distorsion, Sansui compromised the feedback stability and its high power amps using this circuits were not reliable.
A pity that Sansui does not exist anymore, because I very much like its products.
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