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Old 2nd December 2010, 08:50 PM   #11
sardonx is offline sardonx  Canada
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Soooo what's the tweak?
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Old 2nd December 2010, 10:40 PM   #12
AJT is offline AJT  Philippines
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Quote:
Originally Posted by rascal101 View Post
I'm not going to go into the details but the tweaks were on improving the drive circuit of the transistor based power amp of the Sakura AV-200 hybrid amplifier. Essentially, it is a way to reduce the effects of Miller capacitance.

miller capacitance of which stage? this hybrid amp has got several stages....
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Old 11th February 2012, 08:05 AM   #13
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Anyone has the schematic of this amp?
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Old 11th February 2012, 08:16 AM   #14
AJT is offline AJT  Philippines
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Quote:
Originally Posted by coolzero View Post
Anyone has the schematic of this amp?
i do not have the schematic of the SS power amp stage but i copied the tube schemes:

this is the tube rectifier supplying +-6volts dc:
Click the image to open in full size.

and this is the 6N2 cathode followers running on +-12 volts:
Click the image to open in full size.
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Old 22nd June 2016, 07:29 AM   #15
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Anyone converted the SS power amp part to around 20 wpc pure Class A?
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Old 22nd June 2016, 07:56 AM   #16
AJT is offline AJT  Philippines
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Quote:
Originally Posted by eqp2009 View Post
Anyone converted the SS power amp part to around 20 wpc pure Class A?
are you serious? this is a 25wat monoblock class A......careful what you wish for....

Mark Levinson ML-2 : HighEndClassics.com

Click the image to open in full size.
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Old 22nd June 2016, 08:55 AM   #17
DF96 is offline DF96  England
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I'm sure my eyes must be deceiving me, but that appears to be a PSU using 5Z4 rectifiers to produce 6V rails. It would be difficult to think of a sillier way to do this. It also appears to be a circuit using cathode followers running from a 12V rail. It would be difficult to think of a good reason for doing this. Unless, of course, power efficiency and sound quality were not aims of the 'designer', but pushing naive 'audiophile' buttons was the aim. In this it appears he has been hugely successful!
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Old 22nd June 2016, 11:36 AM   #18
AJT is offline AJT  Philippines
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oh yes, DF96, i have had to deal with lots of those, i pull out the two 5z4's
and with just two resistors enable operation without those tubes.....
worse, each half of the 6n2's were left floating, i have had units come to me
with tubes lit but no sound, replacing with say 6bq7/6dj8 restored operations....
paralleled unused sections to avoid future problems.....
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Old 22nd June 2016, 11:42 AM   #19
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Just thinking using the tube preamp of the AV-200T. With the availability of 20W Class A boards and heatsinks online. BTW I own a 100WPC pure class A amp...Thanks
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Old 22nd June 2016, 12:10 PM   #20
AJT is offline AJT  Philippines
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^not worth your time....with just two caps, i was able to run this av200 without those tubes...

sure you can use the preamp section, that is if you like the sound of two 4558 ic......
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