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In Reply to: 45 parafeed SET vs. 845 transformer-coupled PP posted by Kurt Strain on June 11, 2000 at 12:53:37:
... just start secretly buying as many mint condition 45s as you can. I realise that I will have to do the same, and in the process will pick up a few samples of super 300Bs as well.I'm just extremely glad that the speakers that I've truly fallen for have such very high sensitivity (Beauhorns with DX4> 106dB/W/m). It would seem logical that the more work you ask a component to do, the more it will transduce the sound and transform it from its original configuration, n'est-ce-pas?
Have you checked out the Edison Model 60 kit? Very cheap, very good design, loads of tweaking potential, and will take 300Bs, 2A3s or 45s...
jusbePS, could you define the music/sound achieved with the parafeed design?
> > > Have you checked out the Edison Model 60 kit? Very cheap, very good design, loads of tweaking potential, and will take 300Bs, 2A3s or 45s... < < <No, I haven't. Got an URL for more info on that?
> > > PS, could you define the music/sound achieved with the parafeed design? < < <Compared to non-parafeed amps? I haven't done a fair side-by-side on that but there seems a few good things about it: Good bass definition and dynamics, and maybe more detail, depending on implementation, so forth. Parafeed is, like everyone knows about SET amps in general, a very tweaky thing, capable of a broad range of sound differences with minor part and circuit changes. Good component selection is essential. I know many people have reported greatly improved performance with the Paraglows when they tried better DC blocking caps and changed the connection from the primary going to ground to having it go the the top of the cathode resistor, a few of the things I put into my 45 parafeed.
Also, a really good driver tube that complements the system well is absolutely crucial as many people have been saying. I got some unobtanium NOS RCA smoke glass 12SX7 (12V filament version of 6SN7/VT-231, a mil-spec tube) that really does the job there - beats all other 6SN7/VT-231 types I tried in every way.
I am under the impression that the constant-current-sourced active-load driver tube and choke loaded output together make for lesser demands of the power supply's quality - they pretty much filter and keep the load drawing constant current, this constant draw making for solidly defined bass from even loose power supplies.
I have yet to try to add tube rectification to this amp. I keep itching to add it, but as an afterthought it would really make the amp ugly I feel. But my experience with tube rectification for the preamp made me feel I didn't like they way they color the sound to me, so I am reluctant and prejudiced even though everyone seems to say it's really good.
So there's a rundown on how I did my parafeed 45 and what I think is good about it and I of course have limited things to compare to.
Kurt
http://www.hi-fidelity.co.uk/edison
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