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Old 10th May 2010, 06:03 PM   #11
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Quote:
Originally Posted by Olrum View Post
LinuksGuru
It would be interesting to look circuits Sansui....
No problem, attached
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Old 10th May 2010, 06:22 PM   #12
Olrum is offline Olrum  Ukraine
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Quote:
Originally Posted by LinuksGuru View Post
No problem, attached
Very thank you!
Yes of course very similar to McIntosh ...
Then why not have used this solution in ARC, they have almost all models cathodes incorporated into the secondary winding of the transformer. Do not have to develop a new transformer?
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Old 10th May 2010, 07:05 PM   #13
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Quote:
Originally Posted by Olrum View Post
Very thank you!
Yes of course very similar to McIntosh ...
Then why not have used this solution in ARC, they have almost all models cathodes incorporated into the secondary winding of the transformer. Do not have to develop a new transformer?
I'm sure at 90% its due to a cost saving. This kind of solution allows to manufacture output transformers in China, where they would cost only around $20 - $30/pc of material and labor ordered in bulk quantity of few hundreds. On the other hand, transformer with separate CFB (cathode feedback) winding requires very careful and accurate build, resulting in moving production to more advanced factories (with considerable raise of cost of course).
In 60th, when tube amps were flourishing, using combined CFB/secondary winding was a sign of downgraded top-class units, e.g. Sansui AU-70 (a smaller brother of AU-111), which was priced around $150.

PS. If you are keen to have top-class DIY 6550/KT66/KT88 amp, look at the schematic of Harman-Kardon Citation. You will need standard transformers with UL tap and no CFB whatsoever.

Last edited by LinuksGuru; 10th May 2010 at 07:08 PM.
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Old 10th May 2010, 07:22 PM   #14
Olrum is offline Olrum  Ukraine
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Yes it is similar to usual economy. But on the other hand, it gives universality...
And in general that me frightens course of a cathodic current through a secondary winding of the transformer. Similar sense from such inclusion of cathodes for reduction in target resistance of the amplifier very little... I Think here another - improvement of sounding as has noticed, that introduction of 4-5 % of cathodic inclusion in SЕ on 2а3 (Ra=2.7-3k) strongly improves sounding, doing his easy and fast. The same is possible to tell about РР where cathodes of each shoulder of the amplifier are connected through the same of 4-5 % from an anodi half of winding.
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Old 15th May 2010, 10:37 AM   #15
Olrum is offline Olrum  Ukraine
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Default Thank you all!

Thank you all!
I found a very good copy of the documentation VT100 MK2, detailing all the elements.
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