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In the Forum: Audio For Dummies ™
In the Thread: LF Amplifier in biamping.
Post Subject: The possibilities are truly endless.Posted by Romy the Cat on: 6/9/2012
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 Teflon wrote:
If I understand you, your amplifier uses line level frequency selection at the input to each channel, and the output of each channel is optimized for the frequency range of interest -you worry not about the performance of a channel outside of the pass-band providing it doesn't create problems. Am I understanding this properly ?

Yes, it is correct. Each individual amp of DSET configuration is optimized (and not only output) for very specific pass-band, still using the very same basic topology and the optimization methods that do not violate the given topology.

 Teflon wrote:
So, say I take an off-the-shelf stereo SET amplifier of good quality - i.e. designed to cover the full audio spectrum. Then say I take this amplifier and use it to bi-amp a single 2-way speaker. I would then install passive line level frequency filters at the input to each channel, one for LF and the other for HF. The output transformers would be wide band, so they would not be optimized for the frequency range they were used at but it would still work as a DSET topology ? 

Yes, this is viable approach.  The filters might be installed NOT only at input but wherever the topology allows. The main key in such conversion would be replacing the wide band output transformer (that is compromised by default) with two DSET band output transformers – one made for LF and one for HF.

 Teflon wrote:
If I were to replace the output transformers such that the HF channel used a transformer that is 'smaller' with less parasitic inter-winding capacitance and the OPT in the LF channel replaced with a 'larger' one with higher inductance - then I am creating an optimized DSET topology ?

Sure but it might be taken further than this. For instance for HF you might use some faster core or even air core transformer is you cross very high. For LF you use no sectioning, huge core, ability to care larger current, very fat wire with ultra low impedance as parasitic capacitance is irrelevant at LF. Then you can load your HF and LF out tubes differently and slightly differently power them. So, the possibilities are truly endless.

 Teflon wrote:
I don't claim to be familiar with the works of Sakuma-san, I did read the web site with interest though. It seems to me that he had developed a high level of familiarity with the performance, the limitations and the sound of the components he used - especially the Tamura transformers. This allowed him to create the sound he was looking for. And I perceive that he knew how to listen to the sound and knew what he needed to change to achieve his goals. I think this aspect of his work is something you can appreciate. And the benefit he appears to have brought forth was to create in others, the interest to build and listen to tube amplifiers and to encourage others to listen for themselves and learn what they should do to achieve the sound they like - as far as I can tell he did not ask others to copy his work, but rather to develop their own. Unfortunately the website dedicated to his work is not his words and was not created by him and so reflects the interests of it's creators instead. 

I had interest in Sakuma unit I did hear the results, did see his amps and was able to observe what references he personally had in Sound. I did/do not care about what I have witnessed. I do not particularly criticize his crazy use of transformers. I have my reason do not like this direction but it is not the thread about Sakuma. What however need to be understood is that whatever Sakuma was pitching was in context of Tamura transformers from 80s. At that time the top of the line Tamura were good but they do not exist anymore. Tamura was bought out long time ago and nowadays Tamura is made by Chinese corporation that makes transformers for kid’s toys and Home Depot table’s lamps. Sure, they bare the same name but they have absolutely no resemblance sonically with what Tamura did in 80s.

The Cat
 

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