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OK. So yesterday was a listening day. First one in some time now. Health issues had taken the desire. better health caused the ordering of new tubes which, among other things, re-sparked my interest.
So I had been given a tip that plasma TV's were very bad for the electric system and caused harshness in a system. I had not heard this indictment on plasma TV's before. My plasma TV is plugged into the same dedicated circuit as my 2 channel system. So I unplugged it and there seemed to be a greater quantity and quality of bass.
Then last night, I installed the new rectifier tube. I had read that the rectifier tube could make a difference in the sound. And it seemed to do so. It seemed to make for better spacing and placement of the instruments. Vocal harmonies were better in much the same way. And the bass was tighter now. My system is listed. I'm running Gold Lion KT-66 in the Latino ST-70 amp.
Is this experience for real? Or am I just experiencing a case of audiophilia? (Its a better tube than the Sovtek so it has to sound better) Anyone else experience this with the replacement of a rectifier tube?
You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
The Gold Lion U77/GZ34 full wave rectifier is an outstanding tube. Performance rivals if not equals old stock GZ34. How a rectifier sounds is of major consideration. The G.L. U77 sounds wonderful in the amps I have tried it.
Plasma displays are noisy. Illumination is the result of small gas discharge at the pixel level. As to whether this correlates with what
you describe is the question. I would think not but who knows for sure.
The Gold LionU77/GZ34 is a fine sounding tube it is not however a NOS Mullard. Not even close really.
There's really nothing special about a Plasma TV power wise over most other modern AV gear. That being a switch mode power supply. All TV's have had these since the mid 1980s.
I guess the only specific drawback with the Plasma is they do draw more power and thus the power supply may emit more RFI/EMI. And the display panel is PWM based to make gray scales (neon lights don't dim linearly) so that too can emit RFI/EMI.
But consider Europe has strict standards for RFI/EMI with the USA being a bit more lax. But as these TVs are sold world wide, they conform to the strict European standards.
So while it's possible, there shouldn't be much EMI/RFI from a TV unless your tube gear is right under it.
In my world of guitar amps... huge difference. Both tone and reliability.
Been using Sylvania and GE NOS 5AR4 lately. Not as stout sounding as a good British Mullard or Dutch Amperex... but close. And reliable! Great in combo amps.
There are a ton of good old-stock 5U4GB rectifiers. My favorites are the black plates... TS, GE, and RCA.
Same goes for NOS 5Y3GT tubes. GE 6087 and Bendix 6106 seem to be best of the mil spec. 1950 era GE BP 5Y3GT are great tubes, too.
I have a GE 5U4 tube in my main amp that I pulled from an early 1950s DuMont TV that was in use up until the mid 2000s, by an acquaintance's GRANDMother. He was my age, and I'm 62 now, so do the math.
This tube just keeps on going, and is currently playing Whipping Post. Gregg Allman, RIP.
That TV is still in my house. I gave him $50 for it. The tube alone is almost worth it, but I also have a quad of 6L6 from it, and I don't even know what else. I tried to restore it, and I had turned it on hoping for some sound, but nothing. I then broke both wrists the next day in a cycling accident and never went back to it. The schematic is still hanging in my basement. The 10kv in the flyback just scared the hell out of me so I never tried the video. And talk about messy wiring, it was all they could do to make these back then and get them out the door. Wasn't "The Honeymooners" on Dumont?
I get the reliability issue of old Mullard, GE and Syl 5AR4's as opposed to the new manu recto's...but can you please explain the "tone" difference you experience?
If it's a matter of a circuit voltage change, either + or -, I can see that to a certain extent..but what else changes the tone?
Us guitar guys use the sag, to add effect to final tone.
Try the series SS diode tweak plus a Sovtek 5AR4 in an appropriate amp. I think you'll be pleasantly surprised. No arcing and the B+ rail voltage is correct.
The cost of US made OS 5U4s continues to escalate. Only the GE 5U4GB remains "reasonably" priced. Russian and Chinese ST bottle 5U4s are garbage . Fortunately, the current production ElectroHarmonix (EH) 5U4GB is quite decent and it is not expensive.
I have a 50" plasma monitor between my speakers, behind my electronics, hooked to the same circuit. I heard no difference when I put the monitor into use a couple months ago.
I can't compete with the dead (Buck W. 2010)
$45 gets them out the door tomorrow. $50 gets them out the door yesterday (Byrd 2016)
Cowards can't be heroes. (Byrd 2017)
I obviously can't speak to your setup, but I remember one of my first tube rolling experiences was many years ago when I came across a stash of NOS RCA 5AR4's at a repair shop that was shutting down. Swapping those in for the Chinese tubes that came in the Cary SLM-70 amps was a huge change for the better. Well beyond imaginary or "I think I hear....".
My current Art amp uses a pair of GZ37's (CV378). NOS Mullards came in it, and I picked up several replacement pairs a while back so have found no need to play around with them....not even sure if anyone but Mullard made that particular tube.
Can't comment on the plasma...I have a plain Jane LED. :)
Probably a mixture of "Proud Papa Syndrome" and reality. You put a good rectifier in, with great expectations, and the amp is running at the correct B+ voltage. Voila!
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