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In Reply to: Re: Best 300b amp I can build? posted by fred76 on July 10, 2006 at 02:00:58:
Hi,> With your LCR riaa phono you've cap coupled at the output
> (bypassed with smaller films). From experience, do you think
> they would sound 'worse' if you used OPT's, either traditional
> or parafeed?The sound was worse with normal output transformers, with parallel feed we add a transformer after the coupling cap. Much depends on the transformer design. As the item following the phonostage is a transformer volume control one may argue that I indeed use a parallel feed IT after the final stage of the Phono. I felt no need to thro another transformer in.
> In your experience, with IT coupled amps (SE or PP), does an
> input step-up trannie also reduce bandwidth much like using
> two IT's in a 3 stage amp?That depends on the transformer and source impedances. In gear I build using studio grade input transformer I personally tended to prefer a direct input to the grid, leaving the transformer to act as "gridchoke" in many cases, but using a true transformer is usefull if you balanced sources and single ended inputs etc. et al.
A good studio grade line transformer has a very modest sonic footprint, you probably daisyhain three or four before you approach the impact of one iron airgapped traditional IT, sonically speaking.
Ciao T
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Follow Ups
- Re: Best 300b amp I can build? - Thorsten 05:15:59 07/10/06 (1)
- Re: Best 300b amp I can build? - fred76 03:09:37 07/11/06 (0)
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