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In Reply to: RE: No disrepect here Vinnie posted by vinnie2 on February 24, 2015 at 02:57:43
About three years ago, I came up the conclusion about power supply, it is heavy, it is expansive to build. it is difficult to get good parts. another question is why everyone time I build something, I have to build a power supply.
Here is my solution, I built a mono block power supply, each has two rectifier tubes // together, it is tube voltage regulated, it allows me to adjust the B+ range from 260V to 450V, capable to handle 250ma current draw each. Each block has a multiple filament voltage selection; 2.5v, 4v, 5v. two 6.3v. of course the whole thing is heavy as hell.
Now every time when I build something, I just need to concern on the signal section, from SET to PP, I can use the same power supply.
Ok to answer your question, I have one pair of SET, accept 300b and PX25 tube, the output tube socket is from Yamamoto which accept two different tubes, as a result I use same driver tubes, same b+, I can plug two different output tubes by flipping the a switch, change the output tube's cathode resistor. Of course, another switch to change the filament voltage as well.
Under this circumstance, driver tubes are identical, same OPT, even B+ is identical, only difference is the output tube, one is WE reissue 300b, one is vintage Osram PX25, the operation point of both tubes are very similar but the sound is so different, two different character.
attached is my system, at the back is the power supply, it has a umbilical cord to the signal section.
Follow Ups:
I am curious; is it the fact that it is voltage regulated that allows you to adjust the B+? I really am thinking about doing the modular thing for my next project and adjustable B+ would be very desirable.
Funny you should mention that......
several years ago I thought about making modular components for amp building; psu, opts, drivers, etc. I was thinking of the ease of trying different amps.
I never did get around to trying it, but your post has me fired up again for several reasons.
As you say, it wouldn't be portable, but it might be worth it for the results. Nice work on your diy components, they look great.
I appreciate the info on your experience. It appears I am going to have to dig deeper to find out why I am not hearing a large difference as several people are now saying they did under similar conditions as mine. I would suspect my hearing except for the fact that my wife could not hear much difference between them either and she is younger than me. Could have something to do with my listening environment as it is in a large room with concrete floor and block walls. Will have to check into that too i guess.
BTW, what are those great looking speakers you have there?
Edits: 02/24/15
Vinnie,
What is night and day to someone might not be to you. In all my years in audio and I listened to a great deal of things over the years in every aspect of the hobby. I have heard differences where others have said it was night and day and to me it was there but not night and day. I can't say what they hear but I can say what I hear and I think I am pretty good at listening critically and casually.
My friend came over and rearranged my room to fit his taste. I thought it sucked but he liked it better than what I had. I put everything back the way I had it and it was back to my taste. Same stuff, different placement(mainly speakers and wires) and it all changed for him, the better, and for me the worse.
So for someone to say that because you don't hear something, to me is not a correct statement. You hear or don't hear what someone else hears or doesn't hear. You say tomato(long "a"), I say tomato(short "a"). Who's right? You decide. Not someone else.
I do believe that is the situation I am dealing with in my case. I think I am going to stop worrying about it and build the best psu I can and then use it to decide what tubes sound the best to me.
Plain and simple! The "best" power supply is one that works and is reliable. Nothing more! Nothing less!
After you get it to work then play with parts and things that might affect the sound(caps, resistors). But just get it to work first. You might just find that the plain and simple is what you were looking for.
this is one thing I'll suggest you, build a "universal" power supply.
I used the same chassis from China for my amps that were built by a friend. I like their look. Only issue I had was the amount of time they took to get here to the U.S. If I ever use them again I will order them almost 6-8 months ahead of time.
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