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In Reply to: RE: Yes posted by vinnie2 on July 10, 2017 at 09:33:23
Vinnie I build amps where I can change components with nut removal. I use solid pure silver wire with copper and brass hardware.
That being said I have built 2,3 and 4 stage amps with all the so called great load devices. Throw in different transformers and driver and output tube variations and you are well into the hundreds to thousands of variations. Did I mention caps, resistors, wire, fixed, tube fixed, cathode, diode, and various battery bias. Did I forget to mention power supplies? Choke loaded cap loaded small cap loaded with values all over the place.
To give you an example my latest phono stage is 3 stages lcr transformer coupled go against the mainstream monster. I tried about 15 different tubes in the first position with different b+ and current. Guess what did not need a switch to tell me the difference between them. Off the top of my head and it has been a year, some popular ones 12at7 lean
6922 to rich 5842 boring Da3 transistor sounding. Of the well known tubes the 12at7 showed some real promise. The texture and tone on the piano was really good. Attack and decay where also good. It could get a little bright on some recordings so it is gone. The moral of the story no one has my phono stage not even close, so I had to try all this stuff that all the graphs in the world will not do it for me. In regards to not being able to hear differences for more than a few seconds I have no real answer.
Well you seem intent on your position. But you will not be able to further it with my lack of building experience. You could say I am delusional and need to be blind tested into submission but lack of experience, probably not your best defense.
It is a hobby that should be enjoyed so I will leave you to your conclusions. The one thing we know for sure is enjoyment is subjective. So put on John Lee Hooker or BB and party on.
Enjoy the building
You're the one who insinuated that it was probably my lack of building experience that was causing me to think they could all sound the same so I thought it only fair you state your qualification. I would think that with all your vast experience you could just whip together a setup like mine in no time at all and actually base your comments on something you had done. Doesn't seem to be your style though, so I will just leave you to your speculations.
OK Vinnie you baited me one more time. Before I started building all my own stuff I had a standard el34 push pull running in Triode mode. I had a tube salon in Phoenix who loaned me a 300b parallel set amp. What a piece of crap in my system. Now my speakers are only 91 db efficient but a flat load line. Are you getting the point yet. No switches required did not have to listen for the decay in a certain piano passage it was just awful.
Had another amp it was a Cary. You could use el 34, 6550, or kt88's. That was over 15 years ago. Had 2 sets of el 34 tube which where pretty close. Nice midrange nice balance. The RCA 6550 where more detailed but on the lean not real dyanmics side. The kt88 where probability a little midbass heavy but overall tone and dyanmics were very good.
So let me get back to your test. I rolled those tubes in that amp alot. With that circuit the sound was repeatable again and again. Cold or hot same characteristics.
So let's bring this to a logical conclusion. If a person in a OK design tube amp can hear the differences in just the tubes in the same amp, what are the odds in completely different designs with different components and no less output transformers, that a person who can hear might detect a difference???
For the record right now I have the halogen amps for the 845 filament on a switch. The halogen in this push pull was about the same noise but more sterile sounding. Kind of like what a CD does to music. The other switches are on the phono which switch 12 different caps in the riaa section. The caps in that position make a big difference. Almost like having a tone/flavor control.
So to recap without having your amps speakers, front end, clip leads etc... The switch has no bearing. I would bet anyone who can build and hear could make those amps of yours sound different.
I guess when it is all said and done, if YOU can not hear a difference, who gives a shit about what I think??? There are some sincere replies on this thread at least trying to figure out your dilemma.
Enjoy the bread board
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